Morphotropic Phase Boundary, Weak Ferromagnetism, and Strong Piezoelectric Effect in Bi1-xCaxFeO3-x/2 Compounds

abstract

The crystal structure and magnetic and piezoelectric properties of the Bi1-xCaxFeO3-x/2 system (x <= 0.2) are studied. The crystal-structure transformations occur in the following sequence: rhombohedral (R3c) polar phase (x <= 0.06) -> modulated polar phase (0.07 <= x <= 0.1) -> modulated antipolar phase (0.11 <= x <= 0.14). The modulated polar and antipolar phases are weakly ferromagnetic with a spontaneous magnetization of 0.25 G cm(3)/g (x = 0.09). In the polar weak ferromagnet with x = 0.09, a uniform piezoelectric response 2.5 times stronger than in the initial BiFeO3 compound is detected by the piezoelectric force microscopy.

keywords

BISMUTH FERRITE; ANTIFERROMAGNETS

subject category

Physics

authors

Troyanchuk, IO; Karpinsky, DV; Bushinsky, MV; Kovetskaya, MI; Efimova, EA; Eremenko, VV

Groups

acknowledgements

This study was supported financially by the Belarus Republic Foundation for Basic Research (project nos. F09K-043 and T09-090).

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