Abstract
Temperature and electric field dependences of lattice strains of Cu-Cl boracite were accurately measured. The spontaneous pure shear x12 of Cu-Cl boracite is 8 times as large as that of Fe-I boracite, while spontaneous dilatation strains are about half of those of Fe-I boracite. Electrostrictive constants Qd31, and Qd33 show anomalous temperature dependences near the transition temperature. These peculiarities have been successfully explained by our theory of improper ferroelectrics.
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