PHASE-TRANSITIONS IN THE FERROELASTIC [P(CH3)(4)]SBCL6 CRYSTAL

Differential scanning calorimetry, dilatometric, dielectric and linear birefringence measurements have been used to study the ferroelastic [ P(CH3)(4)]SbCl6 crystal. It was found that the crystal undergoes two s tructural phase transitions, at 350 K (second order) and at 405 K (fir st order). The x-ray temperature studies showed that at 350 K the crys tal changes its symmetry from triclinic P (1) over bar to monoclinic C 2/m. Ferroelastic domain structure was found in the room temperature p hase (below 350 K).