Morphotropic phase boundary, weak ferromagnetism, and strong piezoelectric effect in Bi1 − x Ca x FeO3 − x/2 compounds
I. O. TroyanchukSSPA Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, 220072, BelarusD. V. KarpinskySSPA Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, 220072, BelarusM. V. BushinskySSPA Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, 220072, BelarusM. I. KovetskayaSSPA Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, 220072, BelarusЕ. А. ЕфимоваJoint Institute for Nuclear Research, Dubna, 141980, RussiaV. V. EremenkoVerkin Physicotechnical Institute for Low Temperatures, Kharkov, 61103, Ukraine
ABI
Abstract
The crystal structure and magnetic and piezoelectric properties of the Bi1 − x Ca x FeO3 − 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 cm3/g (x = 0.09). In the polar weak ferromagnet with x = 0.09, a uniform piezoelec- tric response 2.5 times stronger than in the initial BiFeO3 compound is detected by the piezoelectric force microscopy.
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