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Phase transitions in ferroelectric ceramics of the type Sr0.5Ba0.5Nb2O6

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
46
Issue
12
Identifiers
DOI: 10.1016/0022-3697(85)90076-9
Keywords
  • Ferroelectric Materials
  • Phase Transition

Abstract

Abstract The ferro-paraelectric transition in Sr 0.5Ba 0.5Nb 2O 6 ceramics has been studied by measuring the dielectric pennitivity as a function of temperature at different frequencies. Experimental results in the transition region over ϵ' max fit the relation 1 ϵ' − 1 ϵ' max = A(T − T 0) γ with γ > 1, as is typical for dif transitions. In an interval of temperatures of 17°C over T 0 (= Tfor ϵ' max ), γ = 2. Using the relaxors' model of Kirillov-Isupov an equation is inferred in order to compute the activation energy of the relaxors as a function of parameters directly obtained from the experimental results.

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