Structural phase transitions in the ordered double perovskite Sr 2MnTeO6

L. Ortega San Martin, J. P. Chapman, E. Hernández-Bocanegra, M. Insausti, M. I. Arriortua, T. Rojo

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

31 Citas (Scopus)

Resumen

The crystal structure of the ordered double perovskite Sr 2MnTeO6 has been refined at ambient temperature from high resolution neutron and x-ray powder diffraction data in the monoclinic space group P121/n1 with a = 5.7009(1)Å, b = 5.6770(1) Å, c = 8.0334(1) Å and β= 90.085(1)°. This represents a combination of in-phase (+) and out-of-phase (-) rotations of virtually undistorted MnO 6 and TeO6 octahedra in the (- - +) sense about the axes of the ideal cubic perovskite. High temperature x-ray powder diffraction shows three structural phase transitions at approximately 250,550 and 675°C, each corresponding to the disappearance of rotations about one of these axes. The first transition was analysed by differential scanning calorimetry and showed a thermal hysteresis with an enthalpy of 0.55 J g-1. We propose the (P121/n1 → 112/m1 → 14/m → Fm3̄m) sequence of structural transitions which has not been previously reported for a double perovskite oxide.

Idioma originalInglés
Páginas (desde-hasta)3879-3888
Número de páginas10
PublicaciónJournal of Physics Condensed Matter
Volumen16
N.º23
DOI
EstadoPublicada - 16 jun. 2004
Publicado de forma externa

Huella

Profundice en los temas de investigación de 'Structural phase transitions in the ordered double perovskite Sr 2MnTeO6'. En conjunto forman una huella única.

Citar esto