کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10629318 | 991054 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of structural characteristics on microwave dielectric properties of MgTi1-x(Mg1/3B2/3)xO3 (BÂ =Â Nb, Ta)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
The dependence of the microwave dielectric properties of MgTi1-x(Mg1/3B2/3)xO3 (B = Nb, Ta, 0.03 â¤Â x â¤Â 0.20) ceramics on their structural characteristics was investigated. A single phase with the ilmenite structure was confirmed through the entire range of compositions. As the (Mg1/3B2/3)4+ content increased at the Ti4+ sites, the unit-cell volume and the average octahedral distortion increased, while the tolerance factor decreased. These results could be attributed to the decrease of both quality factor (Qf) and temperature coefficient of resonant frequency (TCF) of the specimens. MgTi1-x(Mg1/3B2/3)xO3 ceramic specimens with B = Ta5+ showed lower dielectric constant (K) and higher Qf value than those with B = Nb5+ because of their high degree of average covalency. Although the dielectric polarizability of (Mg1/3B2/3)4+ was larger than that of Ti4+, the K value of the specimens decreased linearly with (Mg1/3B2/3)4+ substitution because of the decrease of relative densities of the specimens.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 36, Issue 6, May 2016, Pages 1399-1405
Journal: Journal of the European Ceramic Society - Volume 36, Issue 6, May 2016, Pages 1399-1405
نویسندگان
Hyun Jin Jo, Eung Soo Kim,