Crystallographic shear in the Nb/sub 2/O/sub 5/-WO/sub 3/ and Ta/sub 2/O/sub 5/-WO/sub 3/ systems

Journal Article · Sun Aug 01 00:00:00 EDT 1982 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(82)90401-7· OSTI ID:6386692

England, P J ^[1]; Booth, J; Tilley, R J.D.; Ekstrom, T

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1. Univ. of Bradford, West Yorkshire, UK

Crystallographic shear (CS) phases occurring in the Nb/sub 2/O/sub 5/-WO/sub 3/ and Ta/sub 2/O/sub 5/-WO/sub 3/ systems near to WO/sub 3/ were characterized by X-ray diffraction and high-resolution transmission electron microscopy. The Nb/sub 2/O/sub 5/-WO/sub 3/ samples were heated at 1600K. They contained ordered )104) and )001) CS planes and wavy CS which were composed of intergrowths of )104) and )001) CS segments. The compsition range over which the )104) CS series extended was from (Nb, W)O/sub 2.954/ i.e., (Nb,W)/sub 65/O/sub 192/, i.e., (Nb,W)/sub 52/O/sub 153/. The composition range over which the )001)CS series extended was from (Nb,W)O/sub 2.9375/, i.e., (Nb,W)/sub 16/O/sub 47/ to (Nb,W)O/sub 2.875/, i.e., (Nb,W)/sub 8/O/sub 23/.The Ta/sub 2/O/sub 5/-WO/sub 3/ samples were prepared at 1593, 1623, and 1672K. At lower temperatures ordered )103) CS phases were found, with a composition range extending between (Ta,W)O/sub 2.960/, i.e., (Ta,W)/sub 50/O/sub 148/, to (Ta,W)O/sub 2.944/, i.e., (Ta,W)/sub 36/O/sub 106/. At 1673K ordered )103) CS phases occurred, as did wavy CS composed of intergrowths of )103) and )104) CS segments.

• OSTI ID: 6386692
• Journal Information: J. Solid State Chem.; (United States), Vol. 44:1
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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