1986 年 55 巻 8 号 p. 2695-2700
The measurements of thermal expansion in a random mixture of ferroelectric RbH2PO4(RDP) and antiferroelectric NH4H2PO4(ADP), (RDP)1−x(ADP)x, were made by X-ray diffraction. Anomalous expansion of lattice constants was observed in glassy (RDP)1−x(ADP)x(0.22<x<0.75) at low temperatures, while the crystal symmetry was still tetragonal. Temperature dependence of the anomalous expansion can be related to the idea of cluster condensation. The NH4-concentration dependence of the anomalous expansion implies that the glass is the mixture of two kinds of local strains at low temperatures.
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