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Porosity; pore size; small-angle neutron scattering; dielectric response

Effect of porosity and pore size distribution on the low-frequency dielectric response, in the range 0.01–100 kHz, in sintered ZrO₂—8 mol% Y₂O₃ ceramic compacts have been investigated. Small-angle neutron scattering (SANS) technique has been employed to obtain the pore characteristics like pore size distribution, specific surface area etc. It has been observed that the real and the imaginary parts of the complex dielectric permittivity, for the specimens, depend not only on the porosity but also on the pore size distribution and pore morphology significantly. Unlike normal Debye relaxation process, where the loss tangent vis-à-vis the imaginary part of the dielectric constant shows a pronounced peak, in the present case the same increases at lower frequency region and an anomalous non-Debye type relaxation process manifests.

D Sen¹ T Mahata² A K Patra¹ S Mazumder¹ B P Sharma²

1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
2. Powder Metallurgy Division, Bhabha Atomic Research Centre, Vashi Complex, New Mumbai - 400 705, India

Published

August 2004