Cooperative Displacements of Ba^<2+> Ions in the Incommensurate Structural Phase of Piezoelectric Layer Compound BaMnF_4(Condensed Matter : Structure, Mechanical and Thermal Properties)
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概要
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Structural properties of BaMnF_4 has been studied in the incommensurate phase (ICP) below about 250K by X-ray diffraction. The ICP structure has a unit cell of Na_p×2b_p×2c_p ; N∿5, where a_p, b_p and c_p mean lattice constants at room-temperature commensurate phase (CP). The structure is determined at about 200K in addition to that at room temperature, by using a four-circle X-ray diffractometer. The large distortion of each MnF_6 octahedron, which jointly owns two F^- ions along the a-axis and a F^- ion along the c-axis with a neighbor octahedron, is roughly similar in the ICP phase with those in the CP phase. In the ICP phase, the MnF_6 octahedra show different tilting-scheme between nearest-neighboring two-dimensional MnF_6 octahedra networks (folding screens), which are stacked along the b-axis and alternatively displaced each other with a glide vector of (0, 1/4, 1/4) in the unit cell of the ICP phase. There are two types of folding screens which are stacked along the b_p-axis alternately, and the MnF_6 octahedra in the nearest-neighbor folding screens are mainly characterized by the tilts around the a_0^-, b_0^-, and c_0^-axes and around only the c_0 axis, respectively, where a_0, b_0 and c_0 means primitive axes of the MnF_6 octahedron. It is interpreted that the structural incommensuration in the ICP phase arises from cooperative displacements of Ba^<2+> ions, largely correlated with the localized modulation of MnF_6 zigzag chains along the a_p-axis in BaMnF_4.
- 社団法人日本物理学会の論文
- 2005-04-15
著者
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Yoshimura Michihiro
Research And Development Center For Higher Education Kyushu University:department Of Physics Faculty
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HIDAKA Masanori
Department of Physics, Faculty of Science, Kyushu University
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Hidaka Masanori
Department Of Physics Faculty Of Science Kyushu University
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