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Preparation of Zr(Mo,W)2O8 with a larger negative thermal expansion by controlling the thermal decomposition of Zr(Mo,W)2(OH,Cl)2?2H2O.

ABSTRACT: Solid solutions of Zr(Mo,W)2O7(OH,Cl)2?2H2O with a preset ratio of components were prepared by a hydrothermal method. The chemical composition of the solutions was determined by energy dispersive X-ray spectroscopy (EDX). For all the samples of ZrMoxW2-xO7(OH,Cl)2?2H2O (x?=?0.0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0), TGA and in situ powder X-ray diffraction (PXRD) studies (300-1100?K) were conducted. For each case, the boundaries of the transformations were determined: Zr(Mo,W)2O7(OH,Cl)2?2H2O???orthorhombic-ZrMoxW2-xO8 (425-525?K), orthorhombic-ZrMoxW2-xO8???cubic-ZrMoxW2-xO8 (700-850?K), cubic-ZrMoxW2-xO8???trigonal-ZrMoxW2-xO8 (800-1050?K for x?>?1) and cubic-ZrMoxW2-xO8???oxides (1000-1075?K for x???1). The cell parameters of the disordered cubic-ZrMoxW2-xO8 (space group Pa-3) were measured within 300-900?K, and the thermal expansion coefficients were calculated: -3.5?10-6?-?-4.5?10-6?K-1. For the ordered ZrMo1.8W0.2O8 (space group P213), a negative thermal expansion (NTE) coefficient -9.6?10-6?K-1 (300-400?K) was calculated. Orthorhombic-ZrW2O8 is formed upon the decomposition of ZrW2O7(OH,Cl)2?2H2O within 500-800?K.

SUBMITTER: Petrushina MY 

PROVIDER: S-EPMC5871766 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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Preparation of Zr(Mo,W)<sub>2</sub>O<sub>8</sub> with a larger negative thermal expansion by controlling the thermal decomposition of Zr(Mo,W)<sub>2</sub>(OH,Cl)<sub>2</sub>∙2H<sub>2</sub>O.

Petrushina Mariya Yu MY   Dedova Elena S ES   Filatov Eugeny Yu EY   Plyusnin Pavel E PE   Korenev Sergei V SV   Kulkov Sergei N SN   Derevyannikova Elizaveta A EA   Sharafutdinov Marat R MR   Gubanov Alexander I AI  

Scientific reports 20180328 1

Solid solutions of Zr(Mo,W)<sub>2</sub>O<sub>7</sub>(OH,Cl)<sub>2</sub>∙2H<sub>2</sub>O with a preset ratio of components were prepared by a hydrothermal method. The chemical composition of the solutions was determined by energy dispersive X-ray spectroscopy (EDX). For all the samples of ZrMo<sub>x</sub>W<sub>2-x</sub>O<sub>7</sub>(OH,Cl)<sub>2</sub>∙2H<sub>2</sub>O (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0), TGA and in situ powder X-ray diffraction (PXRD) studies (300-1100   ...[more]

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