کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1476685 1510147 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Correlation of the phonon characteristics and microwave dielectric properties of the Ba(Mg1/3Ta2/3)O3 materials
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Correlation of the phonon characteristics and microwave dielectric properties of the Ba(Mg1/3Ta2/3)O3 materials
چکیده انگلیسی

The Ba(Mg1/3Ta2/3)O3, BMT, materials possess the highest quality factor (Q × f) in microwave frequency regime among the microwave dielectric materials and can potentially be used for high frequency communication application. To understand the mechanism that determines microwave dielectric properties of the BMT materials, spectroscopic techniques including Raman and Fourier transform infrared (FTIR) analyses are used for investigating the phonon characteristics of the materials. The Raman-shift (Δω0j) of the Raman peaks and the resonance frequency (ω0j) of the FTIR peaks vary insignificantly among the samples, which correlate very well with the phenomenon that the K-values for these materials are similar with one another. In contrast, the full-width-at-half-maximum (FWHM) of the Raman peaks and the damping coefficient (γj) of the FTIR peaks vary markedly among the samples. The high-Q materials possess sharpest vibrational modes, viz., smallest FWHM value for Raman peaks and smallest γj value for FTIR peaks and vice versa. The intimate relationship between the phonon characteristics and the fine structure of the materials is confirmed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 27, Issues 8–9, 2007, Pages 2893–2897
نویسندگان
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