کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1484937 1510532 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrical conductivity and dielectric relaxation in non-crystalline films of tungsten trioxide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Electrical conductivity and dielectric relaxation in non-crystalline films of tungsten trioxide
چکیده انگلیسی

Amorphous tungsten trioxide (a-WO3) thin films were prepared by thermal evaporation technique. The electrical conductivity and dielectric properties of the prepared films have been investigated in the frequency range from 100 Hz to 100 kHz and in the temperature range 293–393 K. In spite of the absence of the dielectric loss peaks, application of the dielectric modulus formulism gives a simple method for evaluating the activation energy of the dielectric relaxation. The frequency dependence of σ(ω) follows the Jonscher’s universal dynamic law with the relation σ(ω) = σdc + Aωs, where s is the frequency exponent. The conductivity in the direct regime, σdc, is described by the small polaron model. The electrical conductivity and dielectric properties show that Hunt’s model is well adapted to a-WO3 films.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 353, Issues 44–46, 15 November 2007, Pages 4137–4142
نویسندگان
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