Structures and phase diagram for the system CaTiO3-La2/3TiO3

Zhang, Z. and Lumpkin, G. R. and Howard, C. J. and Knight, K. S. and Whittle, K. R. and Osaka, K. (2007) Structures and phase diagram for the system CaTiO3-La2/3TiO3. Journal of Solid State Chemistry, 180 (3). pp. 1083-1092. DOI 10.1016/j.jssc.2007.01.005

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Abstract

High-resolution neutron and synchrotron X-ray powder diffraction have been used to examine various compositions across the system (1x)CaTiO3xLa2/3TiO3. The structures at room temperature were determined according to composition: in Pbnm for 0pxp0.5, Ibmm for 0.5oxo0.7, then I4/mcm for 0.7txo0.9, and finally in Cmmm for xX0.9. Although the four structures are the same as those proposed previously in an X-ray diffraction study, the phase boundaries are somewhat different, in particular the Pbnm2Ibmm phase boundary has been extended from xt0.4 to x40.5 in the current study based on our high-resolution neutron diffraction data. From in situ measurements to identify structures above room temperature, an approximate composition–temperature phase diagram has been constructed, involving four temperature-induced phase transitions: Pbnm-I4/mcm, Ibmm-I4/mcm, I4/mcm-Pm3¯ m and Cmmm- P4/mmm

Item Type: Article
Uncontrolled Keywords: 2007 P IA53
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Solid State Chemistry
Volume: 180
Page Range: pp. 1083-1092
Identification Number: 10.1016/j.jssc.2007.01.005
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:04
Last Modified: 23 Jul 2013 09:54
URI: http://eprints.esc.cam.ac.uk/id/eprint/838

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