Dislocation instability of an incommensurate phase in connection with the floating phase in an NH4HSe04 crystal
Aleksandrova I. P. , Moskvich Yu. N. , Rozanov O. V., Sadreev A. F. , Sukhovskii A. A.
A temporal instability of an incommensurate phase in NH4HSe04 has been detected for the first time on the basis of the NMR spectra of 77Se. This instability is probably caused by a dislocation-induced floating of this phase. The critical temperature for the process, TCI = — 2 °C, is interpreted as a phase transition to a floating phase.