Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1815661 | Physica B: Condensed Matter | 2009 | 4 Pages |
Abstract
Neutron powder diffraction studies showed that the ordered perovskites Ba2BiSbO6 (BBS) and BaSrBiSbO6 (BSBS) crystallize in a rhombohedral structure with the space group R3¯. The room-temperature lattice parameters are a=6.0351(2) Å; α=60.202(1)° and a=5.9809(2) Å; α=60.045(2)°, respectively. BBS exhibits a dielectric anomaly near room temperature which may be related to structural transition from the R3¯ to low-temperature monoclinic I2/m symmetry. BSBS shows a dielectric anomaly near 723 K which coincides with a phase transition from the rhombohedral to cubic (Fm3¯m) structure. In contrast to BBS, BSBS does not undergo structural transition below room temperature.
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
R.V.K. Mangalam, E. Suard, A. Sundaresan,