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Pressure Dependence of the Lattice Distortion in Perovskite La0.5−xBixCa0.5MnO3 (x=0.1, 0.15, 0.2)

✍ Scribed by X. Wang; Y.W. Pan; Q.L. Cui; J. Zhang; W. Gao; G.T. Zou

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 279 KB
Volume: 160
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2001.9211

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✦ Synopsis

The in situ behavior of distorted perovskite La 0.5؊x Bi x Ca 0.5 MnO 3 (x ‫؍‬ 0.1, 0.15, 0.2) under high pressure has been studied by energy-dispersive X-ray di4raction in a diamond anvil cell. An abnormal change of the 202+040 d-spacing ascribed to the disappearance of the distortion mode Q 2 in the MnO 6 octahedra is observed at 1.2, 1.4, and 1.6 GPa, respectively, and it results in a reduction of the Jahn+Teller distortion commonly existing in the manganites. E4ect of the unique 6s 2 long-pair character of the Bi 3؉ ion on the pressure dependence of the lattice distortion is discussed.

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