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Negative Thermal Expansion in (HfMg)(WO4)3

โœ Scribed by Tomoko Suzuki; Atsushi Omote


Book ID
108575837
Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
504 KB
Volume
87
Category
Article
ISSN
0002-7820

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๐Ÿ“œ SIMILAR VOLUMES


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Sc 2 (WO 4 ) 3 has been found to show the highly unusual property of negative thermal expansion over a temperature range of 10 to 1073 K. Powder neutron diffraction data from 10 to 450 K shows an essentially linear decrease in cell volume as a function of temperature. The intrinsic linear coefficien

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FIG. 1. Structure of Y (WO ) showing YO octahedra (white), W(1)O tetrahedra (light gray), and W(2)O tetrahedra (dark gray).

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Monoclinic NbOPO 4 was found to undergo a readily reversible 5rst-order phase transition at 2923C. The connectivity of the NbO 6 octahedra and PO 4 tetrahedra remains the same throughout the transition, but above the transition the symmetry has increased to orthorhombic and Z has decreased by a fact