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Title: Phase transitions in heated Sr{sub 2}MgTeO{sub 6} double perovskite oxide probed by X-ray diffraction and Raman spectroscopy

Double-perovskite oxide Sr{sub 2}MgTeO{sub 6} has been synthetized, and its crystal structure was probed by the technique of X-ray diffraction at room temperature. The structure is monoclinic, space group I2/m. Temperature-induced phase transitions in this compound were investigated by Raman spectroscopy up to 550 °C. Two low-wavenumber modes corresponding to external lattice vibrations merge at temperature of around 100 °C, indicating a phase transition from the monoclinic (I2/m) to the tetragonal (I4/m) structure. At 300 °C, changes in the slopes of temperature dependencies of external and O–Te–O bending modes are detected and interpreted as a second phase transition from the tetragonal (I4/m) to the cubic (Fm-3m) structure.
Authors:
;  [1] ;  [2] ;  [3]
  1. Equipe Ingénierie et environnement, Laboratoire de Chimie Appliquée et Environnement, Université Hassan 1er, Settat 26000 (Morocco)
  2. Department of Earth Sciences, Uppsala University, SE-752 36 Uppsala (Sweden)
  3. High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA and Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203 (China)
Publication Date:
OSTI Identifier:
22253143
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 26; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; LATTICE VIBRATIONS; MONOCLINIC LATTICES; PEROVSKITE; PHASE TRANSFORMATIONS; PROBES; RAMAN SPECTROSCOPY; SPACE GROUPS; TEMPERATURE RANGE 0273-0400 K; TETRAGONAL LATTICES; X-RAY DIFFRACTION