Low-temperature oxygen migration and negative thermal expansion in ZrW(2-x)Mo(x)O8

J. S.O. Evans; P. A. Hanson; R. M. Ibberson; N. Duan; U. Kameswari; A. W. Sleight

doi:10.1021/ja0013428

Low-temperature oxygen migration and negative thermal expansion in ZrW(2-x)Mo(x)O₈

J. S.O. Evans, P. A. Hanson, R. M. Ibberson, N. Duan, U. Kameswari, A. W. Sleight

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Abstract

The ZrW₂O₈ family of materials has been shown to display the unusual property of an isotropic bulk contraction in volume as a function of temperature. We report here on negative thermal expansion properties and oxygen migration at very low temperatures in ZrW(2-x)Mo(x)O₈ phases. ZrWMoO₈ shows significant negative thermal expansion (α₁ = -8.7 x 10^-6 K^-1) and oxygen migration at temperatures as low as 200 K with an activation energy of 0.23 eV. We are unaware of oxygen migration at such low temperatures in other electronic insulators. The low-temperature migration is associated with an order-disorder transition between the α and β forms of the material with ΔV(disorder) = -0.24%. A negative volume change for an order-disorder transition is unusual.

Original language	English
Pages (from-to)	8694-8699
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	122
Issue number	36
DOIs	https://doi.org/10.1021/ja0013428
State	Published - Sep 13 2000
Externally published	Yes

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title = "Low-temperature oxygen migration and negative thermal expansion in ZrW(2-x)Mo(x)O8",

abstract = "The ZrW2O8 family of materials has been shown to display the unusual property of an isotropic bulk contraction in volume as a function of temperature. We report here on negative thermal expansion properties and oxygen migration at very low temperatures in ZrW(2-x)Mo(x)O8 phases. ZrWMoO8 shows significant negative thermal expansion (α1 = -8.7 x 10-6 K-1) and oxygen migration at temperatures as low as 200 K with an activation energy of 0.23 eV. We are unaware of oxygen migration at such low temperatures in other electronic insulators. The low-temperature migration is associated with an order-disorder transition between the α and β forms of the material with ΔV(disorder) = -0.24%. A negative volume change for an order-disorder transition is unusual.",

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T1 - Low-temperature oxygen migration and negative thermal expansion in ZrW(2-x)Mo(x)O8

AU - Evans, J. S.O.

AU - Hanson, P. A.

AU - Ibberson, R. M.

AU - Duan, N.

AU - Kameswari, U.

AU - Sleight, A. W.

PY - 2000/9/13

Y1 - 2000/9/13

N2 - The ZrW2O8 family of materials has been shown to display the unusual property of an isotropic bulk contraction in volume as a function of temperature. We report here on negative thermal expansion properties and oxygen migration at very low temperatures in ZrW(2-x)Mo(x)O8 phases. ZrWMoO8 shows significant negative thermal expansion (α1 = -8.7 x 10-6 K-1) and oxygen migration at temperatures as low as 200 K with an activation energy of 0.23 eV. We are unaware of oxygen migration at such low temperatures in other electronic insulators. The low-temperature migration is associated with an order-disorder transition between the α and β forms of the material with ΔV(disorder) = -0.24%. A negative volume change for an order-disorder transition is unusual.

AB - The ZrW2O8 family of materials has been shown to display the unusual property of an isotropic bulk contraction in volume as a function of temperature. We report here on negative thermal expansion properties and oxygen migration at very low temperatures in ZrW(2-x)Mo(x)O8 phases. ZrWMoO8 shows significant negative thermal expansion (α1 = -8.7 x 10-6 K-1) and oxygen migration at temperatures as low as 200 K with an activation energy of 0.23 eV. We are unaware of oxygen migration at such low temperatures in other electronic insulators. The low-temperature migration is associated with an order-disorder transition between the α and β forms of the material with ΔV(disorder) = -0.24%. A negative volume change for an order-disorder transition is unusual.

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Low-temperature oxygen migration and negative thermal expansion in ZrW(2-x)Mo(x)O₈

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