Sample records for diffraction neutron
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1

Accelerated carbonation of cement pastes in situ monitored by neutron diffraction

Castellote, Marta; Andrade, Carmen; Turrillas, Xavier; Campo, Javier; Cuello, G. J.
2008-08-31

Digital.CSIC (Spain)

2

Time-resolved neutron diffraction study of Ti–TiC–Al2O3 composites obtained by SHS

Mas-Guindal, M. J.; Turrillas, Xavier; Hansen, T.; Rodríguez, M.A.
2008-11-01

Digital.CSIC (Spain)

3

Understanding magnetic interactions in the series A2FeX5·H2O (A=K, Rb; X=Cl, Br). I. Spin densities by polarized neutron diffraction and DFT calculations

Luzón, Javier; Campo, Javier; Palacio, Fernando; McIntyre, Garry J.; Millán, Ángel

The compounds A2FeX5·H2O A=alkali or NH4; X=Cl, Br form a series of collinear antiferromagnets with transition temperatures in the range from 6 to 23 K. These ordering temperatures are much higher than in other hydrated salts of transition-metal ions with similar distances between magnetic ions. Sp...

DRIVER (Spanish)

5

In-situ monitoring the realkalisation process by neutron diffraction: Electroosmotic flux and portlandite formation

Castellote, Marta; Llorente, Irene; Andrade, Carmen; Turrillas, Xavier; Alonso, C.; Campo, Javier
2006-05-01

Digital.CSIC (Spain)

6

Modelamiento del proceso de carbonatación del hormigón (UR-CORE), con datos de conversión fraccional obtenidos a través de experimentos de difracción de neutrones monitoreados in-situ/ Modelling of the carbonation of concrete (UR-CORE) from fractionafconversion data obtained through in situ monitored neutrón diffraction experiments

Castellote, Marta; Andrade, Carmen
2009-12-01

Resumen en español Una de las principales causas de despasivación de las armaduras embebidas en hormigón es la denominada carbonatación, que consiste en la neutralización de la matriz de cemento como consecuencia de su interacción con el C0(2) atmosférico. En este trabajo, se presenta un resumen del desarrollo de un modelo de carbonatación de las matrices de base cemento (UR-CORE). En primer lugar se ha llevado a cabo la carbonatación acelerada (al 100% de C0(2)) sobre probetas de p (mas) asta de cemento con distintas matrices cementantes tomando espectros de Difracción de Neutrones a lo largo del tiempo de experimento. La evolución de la intensidad de los picos correspondientes a cada una de las fases involucradas ha proporcionado datos de conversión fraccional en tiempo real, lo que ha posibilitado una aproximación cinética al fenómeno de la carbonatación y el desarrollo del modelo UR-CORE, basado en los principios de los sistemas de "núcleo sin reaccionar", típicos de los procesos en ingeniería química Resumen en inglés One of the most important depassivation mechanisms of steel reinforcement in concrete is that caused by the neutralisation of the cement matrix. In this work, a summary of the development of a model for the carbonation of cementitious matrixes (UR-CORE) is presented. On one hand, in-situ monitoring of the changes that take place in the phase composition of cement pastes during accelerated carbonation (100% C02) for different binders, is reported, by taking Neutrón Diffra (mas) ction patterns in parallel with the carbonation experiments. The variation of the intensity of chosen reflections for each phase along the experiment supplied data, in real time, for fractional conversión of different phases. On the second hand, fitting of these results allowed to make a quantitative approach to the kinetics of the carbonation of the different phases, and develop the UR-CORE model that is based on the principies of the "unreacted-core" systems, typical of chemical engineering processes

Scientific Electronic Library Online (Spanish)

7

Two- and three-dimensional magnetic ordering in the bilayer manganite Ca2.5 Sr0.5 GaMn2 O8.

Yusuf, S. M.; Teresa, José María de; Algarabel, Pedro A.; Mukadam, M. D.; Mirebeau, I.; Mignot, J.-M.; Marquina, Clara; Ibarra, M. Ricardo
2006-11-06

Digital.CSIC (Spain)

8

Solid-state Al and Si NMR investigations on Si-substituted hydrogarnets

Rivas-Mercury, J. M.; Pena Castro, María del Pilar; Aza Moya, Antonio H. de; Turrillas, Xavier; Sobrados, I.; Sanz, J.
2007-01-01

Digital.CSIC (Spain)

9

Solid-state 27Al and 29Si NMR characterization of hydrates formed in calcium aluminate–silica fume mixtures

Pena, P.; Rivas-Mercury, J. M.; Aza, A. H. de; Turrillas, Xavier; Sobrados, I.; Sanz, J.
2008-08-01

Digital.CSIC (Spain)

10

Possible quantum critical point in (La1−xDyx)0.7Ca0.3MnO3

Yusuf, S. M.; Teresa, José María de; Ritter, C.; Serrate, D.; Ibarra, M. Ricardo; Yakhmi, J. V.; Sahni, V. C.
2006-10-01

Digital.CSIC (Spain)

11

Nature of the bound states of molecular hydrogen in carbon nanohorns

Fernández-Alonso, Félix; Bermejo, F. Javier; Cabrillo García, Carlos; Loutfy, Raouf O.; Leon, Vincent

The effects of confining molecular hydrogen within carbon nanohorns are studied via high-resolution quasielastic and inelastic neutron spectroscopies. Both sets of data are remarkably different from those obtained in bulk samples in the liquid and crystalline states. At temperatures where bulk hydro...

DRIVER (Spanish)

12

Nature of the bound states of molecular hydrogen in carbon nanohorns

Fernández-Alonso, Félix; Bermejo, Francisco Javier; Cabrillo García, Carlos; Loutfy, Raouf O.; Leon, Vincent; Saboungi, Marie Louise
2007-06-04

Digital.CSIC (Spain)

14

Magneto-volume effects in Fe-Cu solid solutions

Gorria, P.; Martínez-Blanco, D.; Iglesias, R.; Palacios, S. L.; Pérez, M. J.; Blanco, J. A.; Fernández Barquín, L.; Hernando, A.; González, Miguel A.
2006-05-01

Digital.CSIC (Spain)

15

Magnetism and structure of Fe-Cu binary solid solutions obtained by high-energy ball milling

Gorria, P.; Martínez-Blanco, D.; Blanco, J. A.; Pérez, M. J.; González, Miguel A.; Campo, Javier
2006-10-01

Digital.CSIC (Spain)

16

Magnetic and crystal structures of Er5(SixGe1−x)4

Ritter, C.; Magen, C.; Morellón, Luis; Algarabel, Pedro A.; Ibarra, M. Ricardo; Pecharsky, V. K.; Tsokol, A. O.; Gschneidner Jr., K. A.
2006-04-26

Digital.CSIC (Spain)

17

Experimental study of the structural and magnetic properties of -Fe2O3 nanoparticles

Yusuf, S. M.; Teresa, José María de; Mukadam, M. D.; Kohlbrecher, J.; Ibarra, M. Ricardo; Arbiol, J.; Sharma, P.; Kulshreshtha, S. K.
2006-11-01

Digital.CSIC (Spain)

18

Estudio del proceso de sinterización reactiva en sistemas con dolomita mediante termodifractometría de neutrones

Aza Moya, Antonio H. de; Turrillas, Xavier; Rodríguez Galicia, J. L.; Pena Castro, María del Pilar
2004-01-01

Digital.CSIC (Spain)

19

Effect of stretching on the sub-Tg phenylene-ring dynamics of polycarbonate by neutron scattering

Arrese-Igor, Silvia; Mitxelena, Olatz; Arbe, Arantxa; Alegría Loinaz, Ángel; Colmenero de León, Juan

8 pages.-- PACS nrs.: 36.20.Ey, 28.20.Cz. | We have investigated the effect of cold drawing on the motion of phenylene rings in bisphenol-A polycarbonate by neutron scattering. The intensity scattered by isotropic and stretched polycarbonate is different, the quasielastic broadening being larger for...

DRIVER (Spanish)

20

Effect of stretching on the sub-Tg phenylene-ring dynamics of polycarbonate by neutron scattering

Arrese-Igor, Silvia; Mitxelena, Olatz; Arbe, Arantxa; Alegría Loinaz, Ángel; Colmenero de León, Juan; Frick, Bernhard
2008-08-12

Digital.CSIC (Spain)

21

Detailed neutron study of the crossover from long-range to short-range magnetic ordering in (Nd1−xTbx)0.55Sr0.45MnO3 manganites

Teresa, José María de; Ritter, C.; Algarabel, Pedro A.; Yusuf, S. M.; Blasco, Javier; Kumar, Amit; Marquina, Clara; Ibarra, M. Ricardo
2006-12-01

Digital.CSIC (Spain)

22

Dehydration of Ca3Al2(SiO4)y(OH)4(3−y) (0 < y < 0.176) studied by neutron thermodiffractometry

Rivas-Mercury, J. M.; Pena, P.; Aza, A.H. de; Turrillas, Xavier
2008-01-01

Digital.CSIC (Spain)

23

Anomalous x-ray diffraction studies of Sr2+ hydration in aqueous solution

Ramos, S.; Neilson, G. W.; Barnes, A. C.; Capitán, M. J.
2003-03-22

Digital.CSIC (Spain)

24

Neutron scattering investigation of a diluted blend of poly(ethylene oxide) in polyethersulfone

Genix, A. C.; Arbe, Arantxa; Arrese-Igor, Silvia; Colmenero de León, Juan; Richter, Dieter; Frick, Bernhard

11 pages.-- PACS nrs.: 61.41.+e, 64.70.P-.-- PMID: 18532842 [PubMed]. | By using quasielastic neutron scattering (QENS) with isotopic labeling we have investigated the component dynamics in a miscible blend of polyethersulfone (PES) and poly(ethylene oxide) (PEO) with 75% content in weight of PES. D...

DRIVER (Spanish)

25

Neutron scattering investigation of a diluted blend of poly(ethylene oxide) in polyethersulfone

Genix, A. C.; Arbe, Arantxa; Arrese-Igor, Silvia; Colmenero de León, Juan; Richter, Dieter; Frick, Bernhard; Deen, P. P.
2008-05-08

Digital.CSIC (Spain)