Microstructures of Some Bi-W-Nb-O Phases |
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Authors: | Wuzong Zhou |
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Institution: | School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST, United Kingdom |
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Abstract: | Microstructures of three Bi-W-Nb-O phases have been examined by using high-resolution transmission electron microscopy. Bi17W2Nb3O39 and Bi17WNb3O36 have incommensurate superstructures derived from the defect fluorite-type δ-Bi2O3 and can be regarded as intermediate phases between the type II solid solutions in the Bi-Nb-O and Bi-W-O systems. Bi8W2Nb2O23 has a Bi2WO6-like subunit cell with a stepped superstructure. Formation mechanisms of various superstructures are discussed. |
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Keywords: | transmission electron microscopy Bi17W2Nb3O39 Bi17WNb3O36 incommensurate superstructures Bi2O3 solid solutions Bi8W2Nb2O23 Bi2WO6 |
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