J. Phys. France 48, 2019-2021 (1987)
DOI: 10.1051/jphys:0198700480110201900

On the symmetry properties of the incommensurate phase in thiourea

J.M. Perez-Mato et G. Madariaga

Departamento de Fisica, Facultad de Ciencias, Universidad del Pais Vasco, Apdo 644, Bilbao, Spain

Abstract
The symmetry analysis of the incommensurate modulated phase of thiourea reported in [J. Physique 46 (1985) 2187-2195] is revised. Some of its conclusions overstating the relevance of secondary modes for describing the symmetry properties of the modulation are corrected.

Résumé
L'analyse de la symétrie de la phase modulée incommensurable de la thiourée, proposé dans le J. Physique 46 (1985) 2187-2195, est révisée. On corrige certaines des conclusions qui surestimaient l'importance des modes secondaires pour les propriétés de symétrie de la modulation.

PACS
6150K - Crystallographic aspects of phase transformations; pressure effects.
6166H - Organic compounds.

Key words
commensurate incommensurate transformations -- crystal atomic structure of organic compounds -- organic compounds