透過型電子顕微鏡によるLn<sub>2</sub>Mn<sub>x</sub>M<sub>2-x</sub>O<sub>7</sub> (Ln=rare earth or Y, M=Mo, Ta, Nb or W)の構造解析
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- 中野 裕美
- 龍谷大学理工学部電子顕微鏡室
書誌事項
- タイトル別名
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- Structure of Ln2MnxM2-xO7(Ln = rare earth or Y, M = Mo, Ta, Nb or W) Studied by Transmission Electron Microscopy
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Ln2MnxM2-xO7 (Ln=rare earth or Y, M=Mo, Ta, Nb or W) was synthesized under ordinary pressure and various atmospheres with the expectation of achieving various symmetries and properties. These compounds are analyzed as similar structures of rhombohedrally distorted pyrochlore structures by X-ray diffraction (XRD). However, transmission electron microscope (TEM) images reveal differences between structures: Ho2Mn2/3Nb4/3O7 and Er2Mn2/3Mo4/3O7 possessed a monoclinic structure, while Ho2Mn2/3Ta4/3O7 and Ho2MnTaO7 possessed a trigonal structure with an incommesurate nature. The differences in the structures were caused by the stacking sequence along the c-direction of a pair of A cation and B cation layers, where B cations formed a hexagonal tungsten bronze (HTB)-type layer that is a characteristic frame-layer in the pyrochlore-related structure. In the case of Er2MnWO7, however, different types of structures with a trigonal cell show that no pair of A-cation and B-cation layers existed along the c-direction in the crystal.<br>
収録刊行物
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- Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)
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Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) 111 (1299), 800-805, 2003
公益社団法人 日本セラミックス協会
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詳細情報 詳細情報について
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- CRID
- 1390282680225950080
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- NII論文ID
- 110002288126
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- NII書誌ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL書誌ID
- 6748714
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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