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 (NH 4 ) x H 2 PO 4 , for \(0.3{\lesssim}x{\lesssim}1.0\), the phase diagram was determined. For \(0.8{\lesssim}x{\lesssim}1.0\) the long range antiferroelectric phase was observed as like in pure NH 4 H 2 PO 4 . A dipole-glass phase was found in the intermediate concentration range (\(x{\lesssim}0.7\)).