On the phase diagram of[N(CH3)4]2ZnCl4under uniaxial stress

Abstract Optical measurement and microscopic observations have been performed of single crystals of (TMA)2ZnCl4 with the aim to establish its phase diagram in the coordinates temperature-uniaxial stress σ. Stress-induced shifts of transition temperatures have been evaluated. For stresses exceeding 4.5 MPa two new monoclinic phases are reported, tentatively labeled as VIII and IX, both with the monoclinic axis b.