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Ni(NO3)2.6NH3, another example of KCN-type anomalous thermoelastic behaviour

Ni(NO3)2.6NH3, another example of KCN-type anomalous thermoelastic behaviour The temperature dependence of all elastic constants of cubic Ni(NO3)2.6NH3, measured from the transition point at - 34.2 to 150DegreesC by ultrasonic methods, exhibits KCN-type anomalous behaviour. Within a wide temperature range all elastic wave velocities increase with higher temperature. The shear resistance c = (c11 - c12)/2 corresponds to the constant c44 in KCN. The change of c with absolute temperature obeys a logarithmic law like c44 in KCN, namely c = a log T/T0 with a = 0.05975 . 1011 dyn cm-2 and T0 = 156.22DegreesK. The anomalous elastic behaviour should be assigned mainly to the thermally activated motions of the NO3 ions. The phase transition is directly related to the low c value. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography International Union of Crystallography

Ni(NO3)2.6NH3, another example of KCN-type anomalous thermoelastic behaviour

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Ni(NO3)2.6NH3, another example of KCN-type anomalous thermoelastic behaviour

Haussuhl, S
Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography , Volume 30 (3): 455 – May 1, 1974

Abstract

The temperature dependence of all elastic constants of cubic Ni(NO3)2.6NH3, measured from the transition point at - 34.2 to 150DegreesC by ultrasonic methods, exhibits KCN-type anomalous behaviour. Within a wide temperature range all elastic wave velocities increase with higher temperature. The shear resistance c = (c11 - c12)/2 corresponds to the constant c44 in KCN. The change of c with absolute temperature obeys a logarithmic law like c44 in KCN, namely c = a log T/T0 with a = 0.05975 . 1011 dyn cm-2 and T0 = 156.22DegreesK. The anomalous elastic behaviour should be assigned mainly to the thermally activated motions of the NO3 ions. The phase transition is directly related to the low c value.

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Publisher
International Union of Crystallography
Copyright
Copyright (c) 1974 International Union of Crystallography
ISSN
0567-7394
DOI
10.1107/S0567739474000970
Publisher site
See Article on Publisher Site

Abstract

The temperature dependence of all elastic constants of cubic Ni(NO3)2.6NH3, measured from the transition point at - 34.2 to 150DegreesC by ultrasonic methods, exhibits KCN-type anomalous behaviour. Within a wide temperature range all elastic wave velocities increase with higher temperature. The shear resistance c = (c11 - c12)/2 corresponds to the constant c44 in KCN. The change of c with absolute temperature obeys a logarithmic law like c44 in KCN, namely c = a log T/T0 with a = 0.05975 . 1011 dyn cm-2 and T0 = 156.22DegreesK. The anomalous elastic behaviour should be assigned mainly to the thermally activated motions of the NO3 ions. The phase transition is directly related to the low c value.

Journal

Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography – International Union of Crystallography

Published: May 1, 1974

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