High-Pressure Synthesis and Correlation between Structure, Magnetic, and Dielectric Properties in LiNbO3-Type MnMO3 (M = Ti, Sn)

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• 作者：Akihisa Aimi ; Tetsuhiro Katsumata ; Daisuke Mori ; Desheng Fu ; Mitsuru Itoh ; To虃ru Kyo虃men ; Ko-ichi Hiraki ; Toshihiro Takahashi ; Yoshiyuki Inaguma
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：July 4, 2011
• 年：2011
• 卷：50
• 期：13
• 页码：6392-6398
• 全文大小：956K
• 年卷期：v.50,no.13(July 4, 2011)
• ISSN：1520-510X

文摘

LiNbO₃-type MnMO₃ (M = Ti, Sn) were synthesized under high pressure and temperature; their structures and magnetic, dielectric, and thermal properties were investigated; and their relationships were discussed. Optical second harmonic generation and synchrotron powder X-ray diffraction measurements revealed that both of the compounds possess a polar LiNbO₃-type structure at room temperature. Weak ferromagnetism due to canted antiferromagnetic interaction was observed at 25 and 50 K for MnTiO₃ and MnSnO₃, respectively. Anomalies in the dielectric permittivity were observed at the weak ferromagnetic transition temperature for both the compounds, indicating the correlation between magnetic and dielectric properties. These results indicate that LiNbO₃-type compounds with magnetic cations are new candidates for multiferroic materials.