Phase Transitions in Mixed Crystal System K_<1-x>(NH_4)_xH_2PO_4

概要

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Mixed crystals of potassium dihydrogen phosphate and ammonium dihydrogenphosphate (K. .(NH.).H.P0.) have been investigated. Dielectric constants e.. ande.. and elastic compliance (s.,? ,) on the 45' - Z-cut bars were measured. The crystalswith 0<,v<0.17 show temperature dependence of the dielcctric constant e.. andelastic compliance .s'.,? , similar to that of pure KH.P0.. Occurrence of the spon-taneous polarization in these crystals was observed by pyroclectric charge method.The crystals with 0.85<,v! 1 show dielectric and elastic properties similar to those ofpure NH.I-I.PO., except for weak rounding-offs in the anomalies of dielectric cons-tant for smaller x. It was confirmed by X-ray diffraction that the crystal with ,v=0.85undergoes an antiferroelectric phase transition. The crystal with x=O.25 shows broadand round-off anomalies in e.. and s.,? . similar to the temperature dependence of e,in Rb....(NH.)....H.P0. crystal which is reported to show glassy dielectric behavior.
社団法人日本物理学会の論文
1987-02-15