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A New Series of Complex Perovskites La1−xSrxCr1−xTixO3: Structural Characterization

✍ Scribed by Roger H Mitchell; Anton R Chakhmouradian

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
148 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis

A new series of complex perovskite-type compounds La 1؊x Sr x Cr 1؊x Ti x O 3 involving substitutions at both A and B sites was prepared by the ceramic technique (final heating at 1350°C). X-ray powder diffraction and profile-refinement study of this series show it to comprise orthorhombic perovskites (Pbnm, a+b+(2a p , c+(2a p , Z ‫؍‬ 4) in the range 04x40.7 and tetragonal perovskites (I4/mcm, a+(2a p , c+2a p , Z ‫؍‬ 4) in the range 0.84x40.9. The tetragonal to cubic phase transition occurs between x ‫؍‬ 0.9 and 1.0. Cation ordering is not observed in this solid solution series. The structures of the orthorhombic and tetragonal members are derived from the cubic aristotype by rotation of (Cr,Ti)O 6 octahedra. In contrast to most Pbnm-type perovskites, the orthorhombic compounds in the series La 1؊x Sr x Cr 1؊x Ti x O 3 have a'b, possibly resulting from distortion of the octahedra.

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