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Hydrothermal Synthesis of ZrW

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Phase pure, fine ZrW2−δMoδO8 powders with 0.00≤δ≤0.91 were synthesized by a hydrothermal route. As‐synthesized particles exhibited a chemical composition consistent with zirconium tungstate–molybdate hydroxide dihydrate (Zr(W,Mo)2 O7(OH)2ยท2H2O). Transmission electron microscopy revealed a rod‐like morphology with each particle being a single crystal. X‐ray diffraction patterns revealed that the crystallite size as well as the disordered β phase increased with increasing Mo substitution for W. Fourier transform infrared spectroscopy showed characteristic stretching frequencies of Zr–O, (W,Mo)–O tetrahedral, as well as OH stretch. Differential scanning calorimetry showed that the order–disorder transition temperature decreases linearly with Mo content.
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Document Type: Research Article

Affiliations: Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011

Publication date: August 1, 2011

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