Investigation of glassy behavior of lead magnesium niobate relaxors

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Abstract
The dielectric behavior of a solid solution, 10 mol % lead titanate in lead magnesiumniobate, vs temperature at different frequencies is measured and analyzed. The shortcomings of the Vogel–Fulcher relationship are discussed. A more reasonable new relationship: ω=ω0 exp[−(T 0/T m ) p ] is introduced to characterize the relation between the frequency (ω) and the temperature (T m ) at the dielectric constant maximum of the relaxor ferroelectrics. The value of the parameter p in the relationship can be used to characterize the dielectric relaxation strength of relaxor ferroelectrics as well as the relation among the ferroelectrics, the relaxor ferroelectrics, the Debye medium and glass.