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Title: | Structures and phase diagram for the system CaTiO3-La2/3TiO3 |
Authors: | Zhang, Z Lumpkin, GR Howard, CJ Knight, KS Whittle, KR Osaka, K |
Keywords: | Perovskites Crystal structure Phase diagrams Neutron diffraction Synchrotrons Cations |
Issue Date: | Mar-2007 |
Publisher: | Elsevier |
Citation: | Zhang, Z., Lumpkin, G. R., Howard, C. J., Knight, K. S., Whittle, K. R., & Osaka, K. (2007). Structures and phase diagram for the system CaTiO3-La2/3TiO3. Journal of Solid State Chemistry, 180(3), 1083-1092. doi:10.1016/j.jssc.2007.01.005 |
Abstract: | High-resolution neutron and synchrotron X-ray powder diffraction have been used to examine various compositions across the system (1−x)CaTiO3−xLa2/3TiO3. The structures at room temperature were determined according to composition: in Pbnm for 0≤x≤0.5, Ibmm for 0.5<x<0.7, then I4/mcm for 0.7x≤0.9, and finally in Cmmm for x≥0.9. 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 Pbnm↔Ibmm phase boundary has been extended from x≤0.4 to x>0.5 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. © 2007, Elsevier Ltd. |
Gov't Doc #: | 2583 |
URI: | http://dx.doi.org/10.1016/j.jssc.2007.01.005 http://apo.ansto.gov.au/dspace/handle/10238/2423 |
ISSN: | 0022-4596 |
Appears in Collections: | Journal Articles |
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