Structures and phase diagram for the system CaTiO3–La2/3TiO3
2007; Elsevier BV; Volume: 180; Issue: 3 Linguagem: Inglês
10.1016/j.jssc.2007.01.005
ISSN1095-726X
AutoresZhaoming Zhang, Gregory R. Lumpkin, Christopher J. Howard, Kevin S. Knight, Karl R. Whittle, Keiichi Osaka,
Tópico(s)Electronic and Structural Properties of Oxides
ResumoHigh-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 0.7≲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.
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