Successive Structural Phase Transitions in (CH₃)₃NHCdCl₃

Abstract

The successive structural phase transitions in a linear chain compound (CH₃)₃NHCdCl₃ were studied by means of polarizing-microscopic observations and X-ray and dilatometric measurements.
The sequence of the structural phase transitions of (CH₃)₃NHCdCl₃ was found to be,
(Remark: Graphics omitted.)
The transition from the (1×\sqrt3) phase to the (2×\sqrt3) phase was reversible, while the transition from the (2×\sqrt3) phase to the (3×3) phase was irreversible. The transition from the (3×3) phase to the (3×2) phase was also reversible.