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Correct choice of superspace group for an incommensurate phase transition

Correct choice of superspace group for an incommensurate phase transition The Landau theory of second-order phase transitions imposes a precise symmetry requirement on the phase at lower temperature. It is shown how this affects the assignment of superspace groups for incommensurate phases reached by one second-order transition from a disordered state. It is noted that the symmetry requirement appears to have been overlooked in several cases when superspace groups were assigned by other authors. For those materials, namely NaNO2, biphenyl and Rb2ZnBr4(CI4), the correct choice of superspace group is discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A: Foundations of Crystallography International Union of Crystallography

Correct choice of superspace group for an incommensurate phase transition

Correct choice of superspace group for an incommensurate phase transition


Abstract

The Landau theory of second-order phase transitions imposes a precise symmetry requirement on the phase at lower temperature. It is shown how this affects the assignment of superspace groups for incommensurate phases reached by one second-order transition from a disordered state. It is noted that the symmetry requirement appears to have been overlooked in several cases when superspace groups were assigned by other authors. For those materials, namely NaNO2, biphenyl and Rb2ZnBr4(CI4), the correct choice of superspace group is discussed.

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References (3)

Publisher
International Union of Crystallography
Copyright
Copyright (c) 1987 International Union of Crystallography
ISSN
0108-7673
eISSN
1600-5724
DOI
10.1107/S0108767387099379
Publisher site
See Article on Publisher Site

Abstract

The Landau theory of second-order phase transitions imposes a precise symmetry requirement on the phase at lower temperature. It is shown how this affects the assignment of superspace groups for incommensurate phases reached by one second-order transition from a disordered state. It is noted that the symmetry requirement appears to have been overlooked in several cases when superspace groups were assigned by other authors. For those materials, namely NaNO2, biphenyl and Rb2ZnBr4(CI4), the correct choice of superspace group is discussed.

Journal

Acta Crystallographica Section A: Foundations of CrystallographyInternational Union of Crystallography

Published: May 1, 1987

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