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Giant permittivity and Maxwell-Wagner relaxation in Yb : CaTiO3 ceramics (Articolo in rivista)

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Giant permittivity and Maxwell-Wagner relaxation in Yb : CaTiO3 ceramics (Articolo in rivista) (literal)

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Alternative label

M. Viviani; M. Bassoli; V. Buscaglia; M. T. Buscaglia; P. Nanni (2009)
Giant permittivity and Maxwell-Wagner relaxation in Yb : CaTiO3 ceramics
in Journal of physics. D, Applied physics (Online); IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
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In: Journal of Physics D-Applied Physics, vol. 42 (17) article n. 175407. IoP Publishing, 2009. (literal)

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Titolo

Giant permittivity and Maxwell-Wagner relaxation in Yb : CaTiO3 ceramics (literal)

Abstract

Yb-modified CaTiO3 ceramics sintered for 24 h at 1450 °C exhibit a giant apparent permittivity of about 10(4) with a remarkable temperature (30-300 K) and frequency (101-106 Hz) stability (maximum variation: ±20%). After a post-annealing treatment of 48 h at 1100 °C, the dielectric response is strongly modified, with a high frequency, low temperature permittivity corresponding to the intrinsic dielectric behaviour of CaTiO3. A step-like rise in the apparent permittivity and a complex dielectric behaviour is observed with increasing temperature. The overall dielectric response of the ceramics can be interpreted in terms of the Maxwell-Wagner interfacial relaxation and modelled using equivalent circuits. The analysis demonstrates that the as-sintered ceramic consists of semiconducting grains (resistivity <10(4) Omega cm at 300 K) and insulating grain boundaries (resistivity ~10(7) Omega cm at 300 K). Partial reoxidation takes place during post-annealing with the formation of oxygen gradients and increased electrical heterogeneity. In general, the dielectric response will be determined by the extent of the reoxidation reaction during cooling or post-annealing treatment below the sintering temperature. (literal)

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