Sample records for alloy-yundk 25ba

  1. (La2/5Ba2/5Ca1/5)(Mn(2/5)–NiTi3/5)O3: Rietveld studies, dielectric and magnetic properties of new perovskite-related oxides

    Pika Jha; Saroj L Samal; Kandalam V Ramanujachary; Samuel E Lofland; Ashok K Ganguli


    Oxides of the type (La2/5Ba2/5Ca1/5)(Mn(2/5)–NiTi3/5)O3 (0 ≤ ≤ 0.4) have been synthesized by the ceramic route. All the above oxides have been found to crystallize in the cubic perovskite structure. Rietveld refinement of the Ni-based oxide, (La2/5Ba2/5Ca1/5)(Ni2/5Ti3/5)O3 gave rise to a composition (La0.44Ba0.38Ca0.18) (Ni0.42Ti0.58)O2.85(6) and the refined lattice parameter obtained was 3.9411(2) Å (space group $\\bar{3}$; (2) = 0.026, p = 0.074, p = 0.087). A shift from antiferromagnetic to paramagnetic behaviour is observed with increase in nickel concentration, the Mn-rich phases showing antiferromagnetism around 5 K. There is a systematic decrease in the dielectric constant, and loss tangent with increase in Ni concentration (from = 592 for = 0 to = 78 for = 0.4).

  2. Phase transition, microstructures and electromechanical properties of BiAlO3-modified Bi0.5(Na,K)0.5TiO3 lead-free piezoelectric ceramics

    Lead-free piezoelectric (1-x)(Bi0.5(Na0.75K0.25)0.5TiO3)-xBiAlO3 (BNKT25-BA, 0 ≤ x ≤ 0.10) ceramics were synthesized using a conventional solid state reaction method. The incorporation of BA into the BNKT25 lattice was investigated by using X-ray diffraction (XRD), ferroelectric characterizations and electric-field-induced strain behavior. X-ray diffraction revealed a pure perovskite phase for x ≤ 0.050. A phase transformation from tetragonal to pseudocubic was observed at x = 0.050. The polarization hysteresis loops of the BNTK25-BA ceramics indicate that the addition of BA significantly disrupts the ferroelectric order of BNKT25 ceramics. The destabilization of the ferroelectric order is accompanied by an enhancement of the unipolar strain. In particular, a large electric-field-induced strain (S = 0.29%) and a normalized strain (d*33 = Smax/Emax = 484 pm/V) were observed at x = 0.025, near the tetragonal-pseudocubic phase boundary. These results suggest that the BNKT25-BA system is a promising candidate for lead-free electromechanical applications.

  3. A study on efficacy of small examination according to the W/V% barium suspension mixed with sodium-carboxy methyl cellulose

    The aim of this study is to evaluate a efficient w/v% barium suspension and w/v% sodium carboxy methyl cellulose (SCMC) for small bowel examination. Between november 2001 and June 2002, 370 patients were examined small bowel examination with oral administration of barium suspension mixed with SCMC. We classified into six groups including A (fine type 40% BaSO4 mixed 0.5% SCMC and 600 ml 0.5% SCMC administration), B (fine type 30% BaSO4 mixed 0.5% SCMC), C (fine type 20% BaSO4 mixed 0.5% SCMC), D (fine type 25% BaSO4 mixed 0.5% SCMC), E (D mixed coarse type 25% BaSO4 mixed 0.5% SCMC), F (D mixed coarse type 25% BaSO4 mixed 0.75% SCMC). We measured transparency rate of contrast media transit time, administration dose, viscosity and particle size. The transparency rate was higher then 80 kV and 90 kV in 100 kV in the same 20 mAs condition. Transit time was the fastest in A group (mean trans time 56 minutes) and the slowest in E group (mean 100 minutes), Administration dose was the smallest in A group (mean dose 541 ml and the most in E group (mean 1,100 ml), viscosity was the lowest in E (125.1 mpa/s) and the highest in A (375.5 mpa/s), and particle size was 1.0 μ m in A, B, C, and D group, 0.6 μ m, 1.0 μ m, 10.0 μ m in E, F group. In conclusion, we propose that the efficient condition for small examination is high voltage technique, high density BaSO4, and 0.625% w/v SCMC

  4. Correlation between temperature-dependent permittivity dispersion and depolarization behaviours in Zr4+-modified BiFeO3–BaTiO3 piezoelectric ceramics

    Weidong Zeng; Changrong Zhou; Jianrong Xiao; Jiafeng Ma


    The correlation between permittivity frequency dispersion and depoling process upon heating was investigated in Zr4+-modified 0.75BiFeO3–0.25BaTiO3 (BF–BZT) ceramics. The temperature-dependent permittivity r() and the piezoelectric coefficient 33 for poled samples were measured under heating conditions to clarify the depolarization mechanism. The results indicate that the poling temperature plays a crucial role in the domains' alignment process, as expected. The temperature-dependent permittivity frequency dispersion and depolarization behaviours may have same origin. The aligned domains' break up into random state/nanodomains at depoling temperature ( d), which causes strong frequency dependence of the permittivity, simultaneously, induces the loss of piezoelectricity. It suggests that the temperature-dependent permittivity measurements method is a simple way to determine the depolarization temperature.

  5. Dicty_cDB: CHH410 [Dicty_cDB

    Full Text Available 8 0.41 (Q55GK0) RecName: Full=GATA zinc finger domain-containing protei... 37 0.5...CSM/AH/AHB4-C/AHB461Q.Seq.d/ 765 0.0 own update 2004.12.25 Homology vs DNA Score E Sequences producing significant alignments: (bi...ogy vs CSM-cDNA Score E Sequences producing significant alignments: (bits) Value SHK721 (SHK721Q) /CSM/SH/SH... 2e-08 27 AE017332 |AE017332.1 Mycoplasma hyopneumoniae 232, complete genome. 38 3e-08 25 BA000016 |BA000016.3 Clostridium perfring... Score E Sequences producing significant alignments: (bits) Value ( P54682 ) RecName: Full=cAMP-in

  6. A New Family of Perovskite Catalysts for Oxygen-Evolution Reaction in Alkaline Media: BaNiO3 and BaNi(0.83)O(2.5).

    Lee, Jin Goo; Hwang, Jeemin; Hwang, Ho Jung; Jeon, Ok Sung; Jang, Jeongseok; Kwon, Ohchan; Lee, Yeayeon; Han, Byungchan; Shul, Yong-Gun


    Establishment of a sustainable energy society has been strong driving force to develop cost-effective and highly active catalysts for energy conversion and storage devices such as metal-air batteries and electrochemical water splitting systems. This is because the oxygen evolution reaction (OER), a vital reaction for the operation, is substantially sluggish even with precious metals-based catalysts. Here, we show for the first time that a hexagonal perovskite, BaNiO3, can be a highly functional catalyst for OER in alkaline media. We demonstrate that the BaNiO3 performs OER activity at least an order of magnitude higher than an IrO2 catalyst. Using integrated density functional theory calculations and experimental validations, we unveil that the underlying mechanism originates from structural transformation from BaNiO3 to BaNi(0.83)O(2.5) (Ba6Ni5O15) over the OER cycling process. PMID:26910187

  7. Evaluation of the FilmArray® system for detection of Bacillus anthracis, Francisella tularensis, and Yersinia pestis

    Seiner, Derrick R.; Colburn, Heather A.; Baird, Cheryl L.; Bartholomew, Rachel A.; Straub, Tim M.; Victry, Kristin D.; Hutchison, Janine R.; Valentine, Nancy B.; Bruckner-Lea, Cindy J.


    To evaluate the sensitivity and specificity of the Idaho Technologies FilmArray® Biothreat Panel for the detection of Bacillus anthracis (Ba), Francisella tularensis (Ft), and Yersinia pestis (Yp) DNA, and demonstrate the detection of Ba spores. Methods and Results: DNA samples from Ba, Ft and Yp strains and near-neighbors, and live Ba spores were analyzed using the Biothreat Panel, a multiplexed PCR-based assay for 17 pathogens and toxins. Sensitivity studies with DNA suggest a limit of detection of 250 genome equivalents (GEs) per sample. Furthermore, the correct call of Ft, Yp or Bacillus species was made in 63 of 72 samples tested at 25 GE or less. With samples containing 25 Ba Sterne spores, at least one of the two possible Ba markers were identified in all samples tested. We observed no cross-reactivity with near-neighbor DNAs.

  8. Phase Structure, Piezoelectric and Multiferroic Properties of SmCoO3-Modified BiFeO3-BaTiO3 Lead-Free Ceramics

    Jiang, Na; Tian, Mijie; Luo, Lingling; Zheng, Qiaoji; Shi, Dongliang; Lam, Kwok Ho; Xu, Chenggang; Lin, Dunmin


    (0.75- x)BiFeO3-0.25BaTiO3- xSmCoO3 + 1 mol.% MnO2 lead-free multiferroic ceramics were synthesized by a conventional ceramic fabrication technique. The effects of SmCoO3 on phase structure, piezoelectricity and multiferroicity of the ceramics were studied. All the ceramics can be well sintered at a low sintering temperature of 960°C. The crystalline structure of the ceramics is transformed from rhombohedral to tetragonal symmetry with increasing the amount of SmCoO3. A morphotropic phase boundary of rhombohedral and tetragonal phases is formed at x = 0.01-0.04. A small amount of SmCoO3 is shown to improve the ferroelectric, piezoelectric and magnetoelectric properties of the ceramics. For the ceramics with x = 0.01-0.03, enhanced resistivity ( R ˜ 1.2 × 109 Ω cm to 2.1 × 109 Ω cm), piezoelectricity ( d 33 ˜ 65 pC/N to 106 pC/N) and ferroelectricity ( P r ˜ 6.38 μC/cm2 to 22.89 μC/cm2) are obtained. The ferromagnetism of the materials is greatly enhanced by the doping of SmCoO3 such that a very high magnetoelectric coefficient of ˜742 mV/(cm Oe) is obtained at x = 0.01, suggesting a promising potential in multiferroic devices.

  9. Mutation Breeding for Acidic Soil Resistance in Rice

    A suitable electron beam dose for KDML105 rice seed irradiation was discovered. 0.4 kGy dose at energy level 8 MeV was suggested to use in KDML rice with a survival rate at 61%. The best culture media for KDML105 seed in in vitro was MS + Sucrose 3% + CH 0.1% + L-proline 0.1% + phytagel 0.25 % +BA30 mg/l. which initiated an average of 3.90 shoots/seed. In vitro rice plantlets which were cultured in acidic media which a pH lower than 4.0 and added with 30 ppm Al3+ was tested for a suitable dose. We found that a dose 0.1 k Gydose from electron beam was most suitable. At this dose, approximately half of plantlets survived. The young irradiated KDML 105 was grown in hydroponic media with 0, 100, 200, 300, 400, 500 mg/L Al3+ pH 3.5 treatments. It was found that they were inhibited completely by 400 mg/L Al3+. Field experiment was done to find KDML 105 acid resistance lines but none has yet been found. However, anew type of rice was observed with short panicles and numerous shoot buddings, from neutron irradiation. This has been named 'Homkor'.

  10. 57Fe Moessbauer spectroscopy of (Bi, Pb)-2223 and (Tl, Bi)-1223 superconductors

    (Bi0.93Pb0.17)2Sr1.9Ca2.05(Cu1.0257Fe0.01)3Oy and (Tl0.74Bi0.25)(Ba0.2Sr0.8)2Ca2(Cu0.9957Fe0.01)3Oy superconductors were synthesized and investigated by Moessbauer spectroscopy. The samples were carefully characterized by x-ray diffraction, by scanning electron microscopy in combination with energy dispersive x-ray fluorescence (EDX) and by electrical resistivity measurements. Introduction of small quantities of Fe led to a modest decrease in the critical temperatures but the samples remained superconductors. EDX analysis confirmed that iron entered the superconducting phase. The 57Fe Moessbauer spectra of these compounds could be evaluated based on two doublets. The two doublets were assigned to Fe located in the square planar fourfold oxygen coordinated Cu sites and to Fe in the square pyramidal fivefold oxygen coordinated Cu sites in the 2223 and 1223 lattices. The Moessbauer parameters derived in this study were compared with the results obtained for (Tl, Pb)-1223 and (Hg, Pb)-1223 compounds measured earlier. Based on the combined set of data, information on the different chemical bonding of the apical and basal oxygen in the square pyramids and on the layered electronic structure of these superconductors was derived. (author)

  11. Magnetoresistance hysteresis in granular HTSCs as a manifestation of the magnetic flux trapped by superconducting grains in YBCO + CuO composites

    Hysterestic behavior of the magnetoresistance of granular HTSCs and its interaction with the magnetic hysteresis are studied by measuring magnetoresistance R(H) and critical current Ic(H) of composites formed by HTSC Y0.75Lu0.25Ba2Cu3O7 and CuO. A network of Josephson junctions is formed in such composites, in which the nonsuperconducting component plays the role of barriers between HTSC grains. Hysteretic dependences R(H) of magnetoresistance are studied in a wide range of transport current density j and are analyzed in the framework of the two-level model of a granular superconductor, in which dissipation takes place in the Josephson medium and the magnetic flux can be pinned both in grains and in the Josephson medium. The interrelation between the hysteresis of critical current Ic(H) and the evolution of the hysterestic dependence R(H) of the magnetoresistance upon transport current variation is demonstrated experimentally. The effect of the magnetic past history on the hysteretic behavior of R(H) and the emergence of a segment with a negative magnetoresistance are analyzed. It is shown for the first time that the R(H) dependences are characterized by a parameter that is independent of the transport current, viz., the width of the R(H) hysteresis loop

  12. Novel perovskite-related barium tungstate Ba 11W 4O 23

    Hong, Seung-Tae


    Ba 11W 4O 23 was synthesized at 1300 °C, followed by quenching with liquid nitrogen. The crystal structure, which was known to be cryolite-related but has remained unclear, was initially determined by single-crystal X-ray diffraction for the isostructural Ru-substituted compound Ba 11(W 3.1Ru 0.9)O 22.5, which was discovered during exploratory synthesis in the Ba-Ru-O system. The structure of Ba 11W 4O 23 was refined by a combined powder X-ray and neutron Rietveld method ( Fd-3 m, a=17.1823(1) Å, Z=8, Rp=3.09%, Rwp=4.25%, χ2=2.8, 23 °C). The structure is an example of A-site vacancy-ordered 4×4×4 superstructure of a simple perovskite ABO 3, and it may be written as (Ba 1.75□ 0.25)BaWO 5.75□ 0.25, emphasizing vacancies on both metal and anion sites. The local structure of one of two asymmetric tungsten ions is the WO 6 octahedron, typical of perovskite. The other tungsten, however, is surrounded by oxygen and anionic vacancies statistically distributed over three divided sites to form 18 partially occupied oxygen atoms (˜30% on average), represented as WO 18/3. The A-site cation-vacancies are ordered at the 8a ( {1}/{8}, {1}/{8}, {1}/{8}) site in between adjoining WO 18/3 polyhedra which form 1-D arrangements along [110] and equivalent directions. In situ high-temperature XRD data have shown that the quenched Ba 11W 4O 23 at room temperature is isostructural to the high-temperature phase at 1100 °C.

  13. Phase transition, piezoelectric, and multiferroic properties of La(Co{sub 0.5}Mn{sub 0.5})O{sub 3}-modified BiFeO{sub 3}-BaTiO{sub 3} lead-free ceramics

    Luo, Lingling; Jiang, Na; Zou, Xiao; Sun, Ting; Zheng, Qiaoji; Xu, Chenggang; Lin, Dunmin [College of Chemistry and Materials Science, Sichuan Normal University, Chengdu (China); Shi, Dongliang; Lam, Kwok Ho [Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon (China)


    (0.75-x)BiFeO{sub 3}-0.25BaTiO{sub 3}-xLa(Co{sub 0.5}Mn{sub 0.5})O{sub 3} + 1 mol% MnO{sub 2} lead-free ceramics (x = 0-0.10) were synthesized by a conventional solid-state reaction route and the effects of La(Co{sub 0.5}Mn{sub 0.5})O{sub 3} on phase transition, piezoelectric, ferroelectric, and multiferroic properties of the ceramics were investigated. The ceramics can be well sintered at 960 C for 2 h. After the addition of La(Co{sub 0.5}Mn{sub 0.5})O{sub 3}, the crystal structure of the ceramics is transformed from rhombohedral (space group R3c) to orthorhombic symmetry (space group Amm2), and the morphotropic phase boundary (MPB) of rhombohedral and orthorhombic phases is formed at x = 0.01-0.03. The dielectric peak of the ceramics was found to become diffusive with increasing x. The ceramics with x = 0-0.03 possess strong piezoelectricity with d{sub 33} of 95-108 pC N{sup -1}, strong ferroelectricity with P{sub r} of 2.2-18.1 μC cm{sup -2}, considerable magnetoelectric coefficient of 372-672 mV/cmOe, and high Curie temperature of 523-659 C, showing potential applications in multiferroic devices. (copyright 2015 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  14. Structure-property relations in new fluorophosphate glasses singly- and co-doped with Er3+ and Yb3+

    Rare earth (RE3+)-doped fluorophosphate glasses are among the most promising candidates for high-efficiency laser generation in the near-infrared spectral region. By proper choice of composition, these materials can combine the advantages of fluorides (low phonon energies, low refractive indices, extensive optical window, low hygroscopicity) and of oxides (high chemical and mechanical stability and high dopant solubility), resulting in enhancement of the RE3+ emissive properties. In this work, we present the synthesis and structural/spectroscopic investigation of new glasses with composition 25BaF225SrF2(30-x)Al(PO3)3xAlF3(20-z)YF3:zREF3, where x = 20 or 15, RE = Er3+ and/or Yb3+, z = 0.25–5.0 mol%. Results indicate considerable improvement of the emissive properties of both ions when compared to phosphate or even other fluorophosphate host compositions. Long excited state lifetimes (τ = 10 ms for the Er3+ level 4I13/2, and τ = 1.3 ms for the Yb3+ level 2F5/2) imply high fluorescence quantum efficiencies η (up to 85% for both ions). Structural characterization by Raman and multinuclear solid state NMR spectroscopies indicate that the metaphosphate-type chain structure of the Al(PO3)3 vitreous framework is partially depolymerized and dominated by Q(0) and Q(1) units crosslinked by six-coordinate Al species. As revealed by 27Al{31P} rotational echo double resonance (REDOR) NMR results the average local aluminum environment of the x = 20 sample comprises 1.6 phosphate and 4.4 fluoride species. These results indicate a clear bonding preference between aluminum and phosphorus, which is consistent with the desired dominance of fluoride species in the local environment of the rare earth and alkaline earth atoms in these glasses. - Highlights: • New fluorophosphate glass composition with excellent photophysical properties. • Detailed structural insights by multinuclear solid state NMR. • Rare earth bonding preference to fluoride rather than phosphate ions

  15. Pure and Y-substituted BaZrO3 ceramics. A possible support material for fabrication of YBa2Cu3O7-x high-Tc superconductors

    This thesis concerns the preparation and characterization of cuprate based high-Tc superconductors (Y-123 and Bi-2223) and especially development and testing of BaZrO3 based materials. The formation of YBa2Cu3Oy (Y-123) by a CO2-free route involving reaction sintering of stoichiometric mixtures of chemically prepared fine powders of Y2BaCuO5, BaCuO2 and CuO have been studied by thermal and XRD analysis. The synthesis and sintering of BaZrO3 powders prepared by the hydroxide-alkoxide-methanol sol-gel route have been studied. The phase relations in the system BaO-Y2O3-ZrO2 have been studied to determine the solid solubility limits for the perovskite phase BaXYYZrZON (X+X+Z=3) at 1500 deg. C. In the binary system Y2O3-BaZrO3 the solubility limit was found to be ≅19 mol% Y2O3, i.e. Ba0.81Y0.42Zr0.81O3. along the joint BaYO2.5-Ba the boundary was determined to be at BaY0.21Zr0.79O2.895. evidence for a new solid solution series between Ba3Y4O9 and ZrO2 are given, and a partial 1500 deg. C phase diagram for the ternary system BaO-Y2O3-ZrO2 is presented. The growth of BaZrO3 single crystals have been attempted both by a laser zone floating technique and flux methods. The compatibility between YBa2Cu3O7-X and BaZrO3, BaXYYZrZO3-δ as well as BaHfO3 have been studied at 950 deg. and 1050 deg. C. The results show the four most promising candidates as support materials for fabrication of YBa2Cu3Oy to be BaHfO3, BaY0.05Zr0.95O2.975, , BaZrO3 and BaY0.1Zr0.9O2.95. (EG)

  16. Characterization and activity of alkaline earth metals loaded CeO{sub 2}–MO{sub x} (M = Mn, Fe) mixed oxides in catalytic reduction of NO

    Mousavi, Seyed Mahdi [Department of Applied Chemistry and Chemical Engineering, Faculty of Chemistry, University of Tabriz, 5166616471 Tabriz (Iran, Islamic Republic of); Niaei, Aligholi, E-mail: [Department of Applied Chemistry and Chemical Engineering, Faculty of Chemistry, University of Tabriz, 5166616471 Tabriz (Iran, Islamic Republic of); Illán Gómez, María José [Carbon Materials and Environment Research Group, Department of Inorganic Chemistry, Faculty of Science, Universidad de Alicante, Alicante (Spain); Salari, Dariush; Nakhostin Panahi, Parvaneh [Department of Applied Chemistry and Chemical Engineering, Faculty of Chemistry, University of Tabriz, 5166616471 Tabriz (Iran, Islamic Republic of); Abaladejo-Fuentes, Vicente [Carbon Materials and Environment Research Group, Department of Inorganic Chemistry, Faculty of Science, Universidad de Alicante, Alicante (Spain)


    Nanocrystalline CeO{sub 2}–MO{sub x} mixed oxides (M = Mn, Fe) with different M/(M + Ce) molar ratio are prepared by sol–gel combustion method. X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Temperature Programmed Reduction with H{sub 2} (H{sub 2}-TPR) and N{sub 2}-adsorption (BET) analyses are conducted to characterize the physical–chemical properties of the catalysts. The activity of catalysts for reduction of NOx with ammonia has been evaluated. The CeO{sub 2}–MnO{sub x} catalysts showed better low temperature activity than CeO{sub 2}–FeO{sub x}. The superior activity of CeO{sub 2}–MnO{sub x} with Mn/(Mn + Ce) molar ratio of 0.25 respect to other catalysts (with 83% NO conversion and 68% N{sub 2} yield at 200 °C) is associated to nanocrystalline structure, reducibility at low temperature and synergistic effect between Ce and Mn that are observed by XRD, TEM and H{sub 2}-TPR. The CeO{sub 2}–FeO{sub x} catalysts were found to be active at high temperature, being Ce–Fe the best catalyst yielded 82% NO conversion at 300 °C. The effect of alkaline earth metals (Ca, Mg, Sr and Ba) loading on the structure and catalytic activity of cerium mixed oxides are also investigated. Loading of Ba enhanced the NO reduction activity of mixed oxides due to the increase of number of basic sites. Highest performance with 91% NO conversion and 80% N{sub 2} yield attained over CeO{sub 2}–MnO{sub x} (0.25)-Ba (7%) catalyst at 200 °C. - Highlights: • CeO{sub 2}–MO{sub x} mixed oxides (M = Mn, Fe) were synthesized by sol–gel combustion method. • The activity of mixed oxides is evaluated in catalytic reduction of NO with NH{sub 3}. • The CeO{sub 2}–MnO{sub x} showed better activity than CeO{sub 2}–FeO{sub x} due to better redox properties. • Ba loading enhanced the activity due to the increase of number of basic sites. • 91% NO conversion and 80% N{sub 2} yield attained over 7%Ba–Ce{sub 0.75}Mn{sub 0.25}O{sub 2} at 200 °C.

  17. New Method of Preparation of Isomers of the (Ca0.1La0.9)(Ba1.6.5La0.35)Cu3Oy Superconductor with Predicted Maximal Tc

    The 123 superconductor (Ca0.1La0.9)(Ba1.6.5La0.35)Cu3Oy (c) has been prepared by the usual carbonate-oxide method. After oxygenation to the optimal oxygen doping of y=7.135, the maximal Tc=57K. We prepared (c) also via reaction (1): 0.75La(La0.25Ba1.75)Cu3O6.782+0.25Ca0.4La0.6 (La0.65Ba1.35)Cu3O6.806 + 0.033O2 (Ca0.1La9)(Ba1.65La0.35)Cu3)6.854 (1) The initial reagents are also superconductors. The first (a) has a maximal Tc=57K, second (b) - 81K. In reference [1] we have shown that several isomers having the same general formula (c), may exist each having different ratios of the follow- ing possible unit cells: LaBa2Cu3Oy, La(BaLa)Cu3Oy, LaLa2Cu3Oy, CaBa2Cu3Oy, Ca(BaLa)Cu30,CaLa2Cu30. These isomers are formed at different temperatures of the preparation of (c) by carbonate-oxide method [1]. After the formation of compound (c) has been completed, further heating, even to higher temperatures, cannot change one isomer into another. Thus, there is no equilibrium between the (c) isomers and, if there also is no equilibrium in the cases of both isomers (a) and (b), then reaction (1) should not change the ratio of the unit cells. Each cell (i), which is present in (a) in concentration qi(a), should be present in (c) in concentration 0.75qi(a); analogously, each cell (i) which is present in (b) in concentration qi(b) should be present in (c) in concentration 0.25qi(b). According to the cluster component method, [2], Tcmax = ΣqiTi, where Ti is Tcmax of such a hypothetical sample, which contains cells (i) only. Thus the expected Tcmax of (c), prepared via reaction (1), is: Σ0.75qi(a)Ti + Σ0.25qi(b)Ti = 0.75 x 57 + 0.25 x 81 = 63K, i.e. higher by 6 degrees than the Tcmax of (c) prepared by the usual method. We studied reaction (1) via X-ray diffraction. XRD spectra showed that the intensity of the reagents peaks decrease with the time of the reaction and after 100 hours at 950 deg C only peaks of (c) remain (having the same width as the peaks of (c) prepared via the usual