Crystal structures and phase transitions in a-site deficient perovskites Ln1/3TaO3

Zhou, Q. and Saines, P.J. and Sharma, N. and Ting, J. and Kennedy, B.J. and Zhang, Z. and Withers, R.L. and Wallwork, K.S. (2008) Crystal structures and phase transitions in a-site deficient perovskites Ln1/3TaO3. Chemistry of Materials, 20 (21). pp. 6666-6676. ISSN 08974756 (ISSN). (doi:https://doi.org/10.1021/cm8014868) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

The synthesis and structures of the perovskites Ln1/3TaO 3 are described. As the size of the Ln cation is reduced, the compounds display a sequence of structure: P4/mmm/La â?? Cmmm/Ce-Gd â?? Pmma/Tb, Dy â?? Pmc21/Ho, Er. Although apparently tetragonal in P4/mmm, electron diffraction patterns of Tm1/3TaO3 reveal this has a complex incommensurate structure. Likewise Gd1/3TaO 3 appears metrically tetragonal, but electron diffraction and synchrotron X-ray powder diffraction demonstrate this is actually orthorhombic. The suppression of the spontaneous orthorhombic strain in Gd 1/3TaO3 is thought to be due to the proximity to the first-order Cmmm-Pmma transition. Variable temperature studies show both Tb 1/3TaO3 and Dy1/3TaO3 undergo a first-order Cmmm-Pmma transition upon heating. © 2008 American Chemical Society.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Chem. Mater. [Field not mapped to EPrints] AD - School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia [Field not mapped to EPrints] AD - Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia [Field not mapped to EPrints] AD - Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia [Field not mapped to EPrints] AD - Australian Synchrotron, 800 Blackburn Road, Clayton, VIC 3168, Australia [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Crystal structure, Diffraction, Dysprosium compounds, Electron diffraction, Erbium, Erbium compounds, Gadolinium, Holmium, Holographic interferometry, Perovskite, Electron diffraction patterns, First orders, Incommensurate structures, Powder diffractions, Variable temperatures, Phase transitions
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Paul Saines
Date Deposited: 07 Oct 2015 10:14 UTC
Last Modified: 07 Oct 2015 10:15 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50735 (The current URI for this page, for reference purposes)
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