کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1482200 1510506 2009 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrical conduction and dielectric properties of lithium aluminum silicate glasses doped with Cr3+ ions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Electrical conduction and dielectric properties of lithium aluminum silicate glasses doped with Cr3+ ions
چکیده انگلیسی

Amorphous lithium aluminum silicate glass system (LAS) implanted with chromium ions are prepared. The ac and dc conductivities (σac and σdc) of as-prepared bulk samples are measured under vacuum in the temperature range 373–153 K and displayed dielectric dispersion in the frequency range 50 Hz–80 kHz. The ac conductivity versus frequency plots were analyzed by considering a power law: σac∝ωs(s⩽1). A comparison between values of the index s with those numerically calculated from different conduction models reveals that correlated barrier hopping (CBH) is a fairly good model to describe the dominant ac conduction mechanism. The concept of the Meyer–Neldel (MN) rule in the expression of the relaxation time is considered for both ac and dc experimental data. The validity of the CBH model based on the MN (normal and inverted) rule is studied and discussed. Besides, results of the real dielectric constant (ε′), loss factor (ε″) and loss tangent (tan δ) together with the Cole–Cole diagrams and the optical (ε∞) and static (εs) dielectric constants for the studied samples are given and discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 355, Issues 45–47, 1 November 2009, Pages 2239–2249
نویسندگان
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