Some crystal chemical aspects of ferroelectrics with structure of the hexagonal tungsten bronze type
Some crystal chemical aspects of ferroelectrics with structure of the hexagonal tungsten bronze type
复制标题
具有六方钨青铜型结构的铁电体的一些晶体化学特征
DOI：
10.1080/00150199808232344
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发表时间：
1998
期刊：
影响因子：
0.8
通讯作者：
V. Isupov
中科院分区：
文献类型：
--
作者：
V. Isupov
摘要讨论了AB × w3 - xo9型铁电体的晶体化学性质和六方钨青铜（HTB）型铁电体的结构。这些化合物沿c轴（六边形）或垂直于c轴（正交）具有自发极化。正交对称的可能性随着B离子模的尺寸增大而增大。化合物具有不同的上层结构，这似乎是由于B和W离子的不同排序和八面体的倾斜。在这些化合物中也有缓慢的相变，如前所述，这似乎是由一些重建引起的；秩序。它强烈地改变了化合物的性质。上层结构本身和化合物性质（特别是电导率）受到化学计量偏差的强烈影响。本文还讨论了htb型铁电体的其他问题。
Abstract Some crystal chemical aspects of ferroelectrics with formula AB x W 3-xO9 and structure of the hexagonal tungsten bronze (HTB) type are discussed. The compunds have spontaneous polarization either along the c axis (and are hexagonal) or perpendicular to it (and are orthorhombic). The probability of the orthorhombic symmetry increases with die size of the B ions. Compounds have diverse superstructures which seem to be due to different ordering of the B and W ions and octahedra tilting. There are also slow phase transitions in certain of these compounds, described earlier, which seem to be caused by some rebuilding of the took; order. It strongly changes the compound's properties. The superstructure itself and the compound properties (particularly the electric conductivity) are strongly influenced by deviations from the stoichiometry. The paper deals also with other problems of the HTB-type ferroelectrics.