The low and high frequency dielectric relaxations in lead magnesium niobate ceramics

Abstract

The dielectric behaviour of lead magnesium niobate (PMN) was studied, and in particular its dependences on temperature and frequency. Two different relaxations were observed in PMN, one at high frequencies and one at low frequencies. The latter was detected only below T m , the temperature at which ε′ r is maximum at low frequency. Possible mechanisms for this behaviour are discussed. At T m , the two relaxations are partially overlapped due to both a minimum in f r high frequency and a mazimum in f r low frequency.