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VOLUME 40 (1984) | ISSUE 4 | PAGE 129
Dislocation instability of an incommensurate phase in connection with the floating phase in an NH4HSe04 crystal
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.