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Mostrando ítems 31-40 de 42
Artículo
Fluencia a alta temperatura de compuestos alúmina-circona
(1996)
Se ha estudiado la microestructura y la respuesta mecánica en compresión a alta temperatura de dos cerámicos de alúmina reforzada con circona (ZTA), fabricados mediante mezcla de polvos y mediante sol-gel con precursores ...
Artículo
Collective excitations in liquid methanol: A comparison of molecular, lattice-dynamics, and neutron-scattering results
(American Institute of Physics, 1992)
The collective dynamics of liquid methanol‐d4 is studied by means of molecular‐dynamics simulation. The model potential is validated by means of lattice energy calculations and shows a very good agreement with the ...
Artículo
Evidence for a supercooled plastic-crystal phase in solid ethanol
(American Physical Society, 1996)
The existence of an orientationally disordered cubic phase of solid ethanol is revealed by x-ray diffraction and Raman spectroscopic measurements. Such a phase, whose existence was postulated some time ago on the basis of ...
Artículo
Activation entropy and Gibbs free energy for conduction in yttria–stabilized-zirconia single crystals
(American Physical Society, 1995)
The temperature dependence of the activation Gibbs free energy [ΔG(T)] and entropy [ΔS(T)] associated with electric conduction in 12 mol % yttria–stabilized-zirconia single crystals was analyzed. In order to determine the ...
Artículo
Comportamiento eléctrico de monocristales 4.7mol%Y-PSZ
(1998)
La función respuesta escalón de Kohlrausch-Williams-Watts ha permitido incorporar la contribución dieléctrica a la res-puesta eléctrica de los monocristales Y2O3 - Zr02. El modelo de divergencia infrarroja permite interpretar ...
Artículo
Thermodynamic study of commensurate-incommensurate phase transitions in Rb2ZnCl4
(American Physical Society, 1999)
We have performed simultaneous measurements of heat capacity and dielectric constant on a high-quality single crystal of Rb2ZnCl4 near the commensurate-incommensurate transition area. Maximum heat capacity is found to be ...
Artículo
Correlated atomic motions in glassy selenium
(American Institute of Physics Publising LLC, 1994)
The elastic and total (energy-integrated) structure factors for glassy selenium have been measured by means of neutron spectroscopy within the temperature range 15 KT310 K. The correlated nature of the atomic vibrations ...
Artículo
Fluencia en compresión de compuestos de AI2O3-SIC con distintas geometrías de reforzante
(1997)
Se ha analizado la fluencia en compresión de un compuesto cerámico con matriz de alúmina reforzada con un 30% en volumen de plaquetas de SiC. Los ensayos se realizaron a 1400 °C, con velocidades de deformación entre 10'^ ...
Artículo
Superplasticidad en materiales cerámicos. Aplicaciones
(1997)
Las características generales macroscópicas y microscópicas de la superplasticidad son analizadas en detalle. Mediante el análisis de resultados experimentales en policristales de circonia dopada con ytria, se propone una ...
Artículo
Magnetic anisotropy obtained from demagnetization curves: Influence of particle orientation and interactions
(AIP Publishing, 1999-04-27)
The influence of easy axis orientation and interparticle interactions on the apparent magnetic anisotropy distribution, obtained from the demagnetization curve analysis, has been studied. For any particle orientation, the ...