Additional critical point in PbZr^xTi^1-xO³ AT 0.97<x<0.98

Abstract

In the paraelectric phase the electrostrictive properties of PbZr^xTi^1-xO³ solid solutions exibit anomalous variations for 0.93<x<1. Besides changes in the vicinity of the known tricritical point (x≈0.94) the dependences dQ₁₁/dT, dQ₁₂/dT and Q₁₂ (x) showed distinct anomalies near 0.97<x<0.98. Moreover, Curie-Weiss law ε=C/(T-T_o)^γ, γ=1, is only obeyd at x=0.98.