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- W2367232230 abstract "To search for new negative thermal expansion (NTE) materials with the similar structure of Sc2W3O12,GdY(WO4)3,Gd2(MoO4)3, DyGd(MoO4)3 and DyTb(MoO4)3 compounds were synthesized by the standard solid state reaction technique. The variation of cell parameters of these compounds with temperature was measured by powder X-ray diffraction.Unfortunately, it is found that these four kinds of compounds exhibit normal positive thermal expansion in the measured temperature range. The structure analysis indicates that the GdY(WO4)3 is monoclinic CaWO4 (scheelite) type structure, while the Gd2(MoO4)3, DyGd(MoO4)3, DyTb(MoO4)3 compounds are orthorhombic α-Gd2(MoO4)3 type. Both types of structure are relative denser compared with that of negative thermal expansion material Sc2(WO4)3. Moreover, the coordination of some oxygen atoms is three in the CaWO4(scheelite) type and the α-Gd2(MoO4)3 structures. Therefore, the structures can not meet requirements for thermal contraction that the structure is an open, low-density framework and the coordination of oxygen is twofold. So it is impossible to show negative thermal expansion in these compounds." @default.
- W2367232230 created "2016-06-24" @default.
- W2367232230 creator A5051335320 @default.
- W2367232230 date "2003-01-01" @default.
- W2367232230 modified "2023-09-23" @default.
- W2367232230 title "Crystal structure and thermal expansion property of A_2(MO_4)_3 compounds" @default.
- W2367232230 hasPublicationYear "2003" @default.
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