Dipole-Glass Phase in Random Mixture of Ferroelectric and Antiferroelectric: Rb_1−x(NH₄)_xH₂PO₄

Abstract

From the measurements of dielectric constants and X-ray diffraction profiles on a random mixture of a ferroelectric and an antiferroelectric, Rb_1−x(NH₄)_xH₂PO₄, for 0.3\lesssimx\lesssim1.0, the phase diagram was determined. For 0.8\lesssimx\lesssim1.0 the long range antiferroelectric phase was observed as like in pure NH₄H₂PO₄. A dipole-glass phase was found in the intermediate concentration range (x\lesssim0.7).