Synchrotron X-ray diffraction study of the Ba{sub 1−x}SrSnO{sub 3} solid solution

Journal Article · Mon Apr 15 04:00:00 EDT 2013 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2013.01.015· OSTI ID:22304559

Zhou, Qingdi; Kennedy, Brendan J. ^[1]

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1. School of Chemistry, The University of Sydney, Sydney, NSW 2006 (Australia)

At room temperature the sequence of phases with increasing amounts of strontium in the stannate perovskite system Ba{sub 1−x}SrSnO{sub 3} has been established from high resolution synchrotron X-ray powder diffraction. The observed sequence orthorhombic (Pbnm), orthorhombic (Ibmm), tetragonal (I4/mcm), and cubic (Pm3-bar m) is a consequence of the sequential introduction of cooperative tilting of the corner sharing SnO{sub 6} octahedra. The cell volume changes smoothly across the series with no obvious discontinuities associated with the phase transitions. - Graphical abstract: Portions of the synchrotron X-ray diffraction profiles (λ=0.82453 Å) from selected Ba{sub 1−x}Sr{sub x}SnO{sub 3} samples together with the results of fitting by the Rietveld method. Highlights: ► Structures of the stannate perovskites Ba{sub 1−x}SrSnO{sub 3} refined from synchrotron XRD. ► The sequence Pm3-bar m→I4/mcm→Ibmm→Pbnm results from tilting of the octahedra. ► The tilting maintains optimal bonding of the cations seen from the BVS analysis.

• OSTI ID: 22304559
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 200; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CATIONS
CUBIC LATTICES
ORTHORHOMBIC LATTICES
PEROVSKITE
PHASE TRANSFORMATIONS
SOLID SOLUTIONS
SPACE GROUPS
STRONTIUM
SYNCHROTRONS
TETRAGONAL LATTICES
X-RAY DIFFRACTION