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A variable temperature synchrotron X-ray diffraction study of the ferroelastic double perovskite Ba2GdMoO6
Thomas K Wallace1, Ross H Colman, Abbie C McLaughlin
1Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK.
Physical Chemistry Chemical Physics : PCCP
|January 17, 2013
Summary
The double perovskite Ba2GdMoO6 exhibits structural distortions at low temperatures, transitioning from cubic to tetragonal and then triclinic symmetry. These transitions are linked to ferroelastic domain formation, impacting its magnetic properties.
Area of Science:
- Materials Science
- Solid State Physics
- Crystallography
Background:
- Double perovskites are complex oxides with tunable magnetic and electronic properties.
- Understanding structural phase transitions is crucial for designing novel materials.
Purpose of the Study:
- To investigate the magnetic and structural properties of Ba2GdMoO6.
- To characterize the phase transitions and ferroelastic behavior of Ba2GdMoO6.
Main Methods:
- Variable temperature synchrotron powder X-ray diffraction.
- Magnetic susceptibility measurements.
- Rietveld refinement techniques.
Main Results:
- Ba2GdMoO6 undergoes structural distortions from cubic to tetragonal at 220 K and to triclinic at 80 K.
- Evidence of ferroelastic domain formation at the cubic-tetragonal phase transition.
- Phase transitions are reflected in magnetic susceptibility data.
Conclusions:
- Ba2GdMoO6 exhibits complex structural phase transitions with ferroelastic characteristics.
- The study provides insights into the relationship between structure and magnetism in double perovskites.
