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Cation Size Variance Effects in High-Tolerance Factor Ln0.7M0.3MnO3 Perovskites

✍ Scribed by Lide M Rodrı́guez-Martı́nez; Helmut Ehrenberg; J.Paul Attfield

Book ID
102609067
Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
166 KB
Volume
148
Category
Article
ISSN
0022-4596

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✦ Synopsis

A series of 5ve Ln 0.7 M 0.3 MnO 3 perovskites (Ln ‫؍‬ trivalent lanthanide; M ‫؍‬ divalent alkaline earth) has been prepared. These have the same mean A-cation site radius of 1.26 A s (equivalent to a perovskite tolerance factor of 0.98) but varying amounts of A-cation size disparity quanti5ed by the size variance 2 . As this increases, the temperatures of the metal+insulator and Curie transitions show a strong linear decrease but that of the structural transition between rhombohedral R3 c and orthorhombic Imma phases increases. Extrapolation from these and previous data indicates that the maximum metal+insulator temperature for an Ln 0.7 M 0.3 MnO 3 perovskite is &550 K. Di4erent methods for estimating the Curie temperature are compared.

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