Abstract
By means of an optical investigation of Cr-Cl boracite crystals in polarized light it has been found that an orthorhombic mm2 phase is induced by stress, generated at the mechanically non-matching cubic (43m)/tetragonal (42m) interface, during the first order phase transition at T1 = 264 K. Electric field studies under simultaneous optical control have shown that the orthorhombic mm2 phase can also be induced in the entire temperature range of the non-polar 42m phase above an electric threshold field strength of about 90 kV · cm-1. On the basis of optical domain observations and electric measurements, a revised electric field strength/temperature phase diagram is proposed and discussed.
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