Abstract
K2ZnGeO4 belongs to the ‘stuffed’ cristobalite structural type. The α-form (SG Pca21) changes to β-form (SG F 3m) above 1049 K by a displacive/rotational transformation with ferroelectric/ferroelastic character, in which the strain is only coupled with the order parameter. The distortion leading from β-HT to α-LT form results from important strains and geared rotations of the ZnO4 and GeO4 tetrahedra. The broad permittivity peak around the transition temperature is typical of a first-order transition. A comparison with isotypic compounds shows that the covalency of the structural skeleton plays a major role in the transition phenomenon.
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