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Kinetic study of PZN single crystal polarization under a static electric field

1999; Taylor & Francis; Volume: 235; Issue: 1 Linguagem: Inglês

10.1080/00150199908214875

1563-5112

Hichem Dammak, A. Lebon, G. Calvarin,

Electronic and Structural Properties of Oxides

Abstract A kinetic effect is evidenced in lead zinc niobate (PZN). We measured the time dependencies of the polarisation P(t) of a single crystal. At a given temperature and electric field, P(t) is described by the expression P(t) = P ∞(T) f(t/τ(E, T)) where τ(E, T) is the incubation time above which the sample is completely polarised. The τ(E, T) was fitted using the exponential law exp[(W+kδ T /E)/kT] where the activation energy W is equal to 0.91±0.36 eV and δ T is equal to 2.2x108 K V/m in the 300—360 K temperature range. Taking into account this kinetic effect the electric-field-temperature diagram and the existence of an electric field threshold were discussed.