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Synthesis and Lattice Distortion of Ferroelectric/Antiferroelectric Bi(III)-containing Perovskites

Published online by Cambridge University Press:  11 February 2011

Yoshiyuki Inaguma ,
Atsushi Miyaguchi  and
Tetsuhiro Katsumata
Yoshiyuki Inaguma
Affiliation:
Department of Chemistry, Faculty of Science, Gakushuin University, 1–5–1 Mejiro, Toshima-ku, Tokyo, 171–8588, Japan
Atsushi Miyaguchi
Affiliation:
Department of Chemistry, Faculty of Science, Gakushuin University, 1–5–1 Mejiro, Toshima-ku, Tokyo, 171–8588, Japan
Tetsuhiro Katsumata
Affiliation:
Department of Chemistry, Faculty of Science, Gakushuin University, 1–5–1 Mejiro, Toshima-ku, Tokyo, 171–8588, Japan
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Abstract

Bi(III)-containing perovskites Bi1/2Ag1/2TiO3 and Bi(M1/2Ti1/2)O3 (M= Co, Mg, and Ni) were synthesized under oxygen pressure as high as approximately 1 MPa and under a pressure as high as 6 GPa, and the lattice distortions were investigated. It was found that ferroelectric Bi1/2Ag1/2TiO3 may be rhombohedrally distorted. In constrast, Bi(M1/2Ti1/2)O3 (M= Co, Mg, and Ni), the structure of which is different from GdFeO3-type compound, is monoclinically distorted. The ratio of lattice parameters of the monoclinic perovskite-subcell for Bi(M1/2Ti1/2)O3 (M= Co, Mg, and Ni), am/bm is larger than that of GdFeO3-type perovskites, though the tolerance factor is close. In addition, it was found that Bi(Ni1/2Ti1/2)O3 undergoes a first-order phase transition from a GdFeO3-type phase(high-temperature phase) at around 490 K. These results indicate that the Bi3+ character in Bi(III)-containing perovskites strongly influences the structure distortion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 755: Symposium DD – Solid-State Chemistry of Inorganic Materials IV , 2002 , DD12.10
Copyright
Copyright © Materials Research Society 2003

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