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

Mariya Yu Petrushina, Elena S. Dedova, Eugeny Yu Filatov, Pavel E. Plyusnin, Sergei V. Korenev, Sergei N. Kulkov, Elizaveta A. Derevyannikova, Marat R. Sharafutdinov, Alexander I. Gubanov

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4 Citations (Scopus)

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.

Original languageEnglish
Article number5337
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - 1 Dec 2018

ASJC Scopus subject areas

  • General

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