X-ray diffraction study of NH4HSeO4 and ND4DSeO 4

A. Rozycki , F. Dénoyer , A. Novak

This paper reports results obtained from an X-ray diffraction study of NH4HSeO4 and ND4DSeO4 single crystals in their various phases. In connection with incommensurability: a) a 3c-superstructure phase has been found both in AHSe and in ADSe, b) a 2c-superstructure has been discovered in ADSe. The non-equilibrium processes have been identified clarifying the situation about the phase diagram.

Mots clés: ammonium compounds; commensurate incommensurate transformations; crystal atomic structure of inorganic compounds; ferroelectric materials; phase diagrams

Domaines: Articles anciens

A. Rozycki, F. Dénoyer, A. Novak. X-ray diffraction study of NH4HSeO4 and ND4DSeO 4. Journal de Physique, 1987, 48 (9), pp.1553-1558. ⟨10.1051/jphys:019870048090155300⟩. ⟨jpa-00210589⟩