کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1473863 991064 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of humidity on the dielectric constant and electrical impedance of mesoporous zirconia ceramics
ترجمه فارسی عنوان
اثر رطوبت بر روی مقاومت دی الکتریک و امپدانس الکتریکی سرامیک زیرکونیک مزوپور
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

The effect of humidity on the dielectric constant and electrical impedance of porous 8 mol% yttria stabilized zirconia ceramic is examined. Samples with pore volume fractions from 33% to 55% were prepared from a fine powder by uniaxial pressing and firing. Measurements, in different relative humidities from <3% to 100%, showed a strong increase of dielectric constant with water content of the unfired and fired porous ceramics. The dielectric constant can be described with good agreement to experimental values using a 2 step model involving the Hashin-Shtrikman upper bound and Landauer’s effective medium relation, analogous to the behavior of thermal conductivity. Water is assumed to be located as a layer of variable thickness on the interior solid surfaces of the pores. A.c. impedance measurements also reveal a short circuit of insulating dielectric behavior at higher water contents, interpreted as surface conduction of protons.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 36, Issue 1, January 2016, Pages 163–169
نویسندگان
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