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

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X-ray study on a random mixture of a ferroelectric and an antiferroelectric, Rb_1−x(NH₄)_xH₂PO₄, has been carried out. The glassy phase (dipole-glass phase) is found to be tetragonal, although the deviation of a lattice parameter from the Debye approximation is seen at low temperatures. The intensity of the X-ray diffuse scattering increases with decreasing temperature in the glassy phase. The results suggest a freezing of the short range order or the local polarization in the glassy phase.