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Issue 12, 2001
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Preparation of the negative thermal expansion material cubic ZrMo2O8

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Abstract

The negative thermal expansion material cubic ZrMo2O8 can be prepared by the carefully controlled dehydration of ZrMo2O7(OH)2·2H2O. The quality of the end product is dependent upon the route used to prepare the ZrMo2O7(OH)2·2H2O. The influence of both the Zr∶Mo ratio in the solution used to prepare the hydrate and the type of acid used in its preparation (HCl, H2SO4, CH3CO2H, HNO3 and HClO4) are examined. Not all acids provide media suitable for the preparation of ZrMo2O7(OH)2·2H2O. Cubic ZrMo2O8 could only be obtained from precipitates containing the hydrate. Starting solutions with a Zr∶Mo ratio in excess of 1∶2 were necessary to avoid coprecipitation of amorphous MoO3. The nature of the acid used in the hydrate synthesis affects the morphology of both the hydrate precursor and the cubic ZrMo2O8 particles. Many of the syntheses examined led to cubic ZrMo2O8 contaminated with amorphous impurities. Highly crystalline pure material could be obtained by using a perchloric acid medium for the synthesis of the hydrate precursor.

Graphical abstract: Preparation of the negative thermal expansion material cubic ZrMo2O8

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Publication details

The article was received on 15 May 2001, accepted on 27 Jul 2001 and first published on 27 Sep 2001


Article type: Paper
DOI: 10.1039/B104283C
J. Mater. Chem., 2001,11, 3354-3359

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    Preparation of the negative thermal expansion material cubic ZrMo2O8

    C. Lind, A. P. Wilkinson, C. J. Rawn and E. A. Payzant, J. Mater. Chem., 2001, 11, 3354
    DOI: 10.1039/B104283C

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