Negative thermal expansion in Y2Mo3O12

The crystal structure of Y2Mo3O12 was refined by the Rietveld method for 130 deg C as orthorhombic with space group Pbcn (No. 60). It is isostructural to Fe2Mo3O12 and consists of vertex sharing YO6 and MoO4 building polyhedra. Y2Mo3O12 has very high negative thermal expansion along all three crysta...

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Veröffentlicht in:	Solid state sciences 2005-11, Vol.7 (11), p.1377-1383
Hauptverfasser:	MARINKOVIC, B. A, JARDIM, P. M, DE AVILLEZ, R. R, RIZZO, F
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: structure, mechanical and thermal properties Crystalline state (including molecular motions in solids) Exact sciences and technology Physics Structure of solids and liquids crystallography Structure of specific crystalline solids Theory of crystal structure, crystal symmetry calculations and modeling Thermal properties of condensed matter
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	The crystal structure of Y2Mo3O12 was refined by the Rietveld method for 130 deg C as orthorhombic with space group Pbcn (No. 60). It is isostructural to Fe2Mo3O12 and consists of vertex sharing YO6 and MoO4 building polyhedra. Y2Mo3O12 has very high negative thermal expansion along all three crystallographic directions in the 130-900 deg C temperature range. The overall linear coefficient of thermal expansion (alphal=alphav/3) is . Water molecules enter freely in Y2Mo3O12 microchannels and seem to have a role in partial amorphization of this compound at room temperature.
ISSN:	1293-2558 1873-3085
DOI:	10.1016/j.solidstatesciences.2005.08.012