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Dielectric, pyroelectric, and thermally stimulated depolarization current investigations on lead-lanthanum zirconate-titanate- x /95/5 ceramics with La content x =0.5%–4%

1993; American Institute of Physics; Volume: 73; Issue: 1 Linguagem: Inglês

10.1063/1.353857

1520-8850

J. Hańderek, Z. Ujma, C. Carabatos‐Nédelec, G. E. Kugel, D. Dmytrów, I. El‐Harrad,

Acoustic Wave Resonator Technologies

It is shown that La dopants have a strong influence on the antiferroelectric- ferroelectric-paraelectric (AFE-FE-PE) phase transitions and properties of the lead-lanthanum zirconate-titanate-x/95/5 ceramics (with La contents x=0.5%–4%). The occurrence of the ferroelectric microdomains, dispersed in the AFE and PE matrices, gives rise to properties typical for ferroelectric relaxors. The space-charge concentration polarization, formed by some mobile ion defects, plays an important role in this behavior. This space-charge polarization and its interaction with the spontaneous polarization was investigated by dielectric, pyroelectric, and thermally stimulated depolarization current measurements. A qualitative model of interpretation is discussed.