Effect of Hydrostatic Pressure on the Phase Transitions in Ferroelectric Ca_2Sr(C_2H_5COO)_6 and Ca_2Pb(C_2H_5COO)_6

概要

論文の詳細を見る
Effects of hydrostatic pressure on the phase transitions in ferroelectric Ca_2Sr(C_2H_5COO)_6 and Ca_2Pb(C_2H_5COO)_6 were studied by dielectric constant measurements in a temperature range of -100∼+200℃ and a pressure range up to about 8.5kbar. The I-II transition temperatures (8.7℃ in the Sr-salt, 60.4℃ in the Pb-salt at 1 atm) monotonically increase with increasing pressure with initial slopes of 19.7 deg kbar^<-1> for the Sr-salt and 23.4 deg kbar^<-1> for the Pb-salt, respectively. The II-III transition temperatures (-173℃ in the Sr-salt, -88℃ in the Pb-salt at 1 atm) increase with increasing pressure, and first order II-III phase boundaries terminate at critical points of p_<crit>=3.35 kbar; T_<crit>=-35℃ in the Sr-salt, and p_<crit>=1.73 kbar; T_<crit>=-41℃ in the Pb-salt, respectively. A sharp maximum of low frequency dielectric constant was found at the critical point of the Pb-salt.
社団法人日本物理学会の論文
1975-10-15