Phase transitions in ceramic AgNbo3 investigated at high hydrostatic pressure

The influence of hydrostatic pressure on dielectric permeability in ceramic AgNbO3 as function of temperature was studied. Parameters T0, C, p0, C* and Qh were determined. It was ascertained that phase transition temperatures T1 and T2 shift towards lower temperatures at the rates of dT1/ dp = -30 ± 3 K/GPa and dT2/dp = -37 ± 6 K/GPa while T3 and T4 shift towards higher temperatures at the rates of dT3/dp =28 ± 7K/GPa and dT4/dp = 58 ± 9K/GPa. The possibility of existence of ferroelectric phase up to T3 = 610 K is discussed.