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Open Access Enhanced negative thermal expansion by solid solution of HfMgMo1.5W1.5O12

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HfMgMo3O12 exhibits a low positive thermal expansion and HfMgW3O12 displays a low negative thermal expansion (NTE). It is found that the solid solution of HfMgMo1.5W1.5O12 has an enhanced NTE with lower anisotropy with respect to HfMgMo3O12 and HfMgW3O12. The coefficients of thermal expansion (CTEs) for HfMgMo1.5W1.5O12 are α a = –6.78 × 10–6 K–1, α b = 6.59 × 10–6 K–1, α c = –5.23 × 10–6 K–1, α v = –6.19 × 106– K–1 for the a-, b- and c-axes and volume, respectively. This gives rise to a linear CTE of α l = –2.06 × 10–6 K–1. The alternative arrangements of W and Mo around each octahedra and differences in electronegativity and cation radius between W and Mo account probably for the enhanced NTE and decreased anisotropy with respect to HfMgMo3O12.

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Document Type: Research Article

Publication date: December 1, 2016

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