کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1611656 1516303 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-Q microwave dielectrics in the (Mg1−xZnx)4Ta2O9 ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
High-Q microwave dielectrics in the (Mg1−xZnx)4Ta2O9 ceramics
چکیده انگلیسی
(Mg1−xZnx)4Ta2O9 (x = 0.02-0.08) ceramics were prepared using a solid-state reaction process, and their dielectric properties were characterized at microwave frequency. The formation of solid solutions (Mg1−xZnx)4Ta2O9 were confirmed by the X-ray diffraction patterns. Molecular volumes (Vm) and ionic polarizabilities (αobs) of the specimens were also calculated, which varied linearly from Vm = 323.99 Å, αobs = 61.321 Å3 for (Mg0.98Zn0.02)4Ta2O9 to Vm = 324.24 Å, αobs = 61.510 Å3 for (Mg0.92Zn0.08)4Ta2O9. The dielectric properties are strongly dependent on the compositions, the densifications and the microstructures of the specimens. The composition (Mg0.95Zn0.05)4Ta2O9 has good microwave dielectric properties with an ɛr of 12.67, an extremely high Q × f of 385,000 GHz, and a τf of −61.9 ppm/°C. Addition of B2O3 can lower the sintering temperatures of specimens; whereas it also degrades the Q × f values.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 590, 25 March 2014, Pages 494-499
نویسندگان
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