کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1625018 1516420 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sinterability studies and microwave dielectric properties of sol–gel synthesized Ba(Zn1/3Ta2/3)O3 nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Sinterability studies and microwave dielectric properties of sol–gel synthesized Ba(Zn1/3Ta2/3)O3 nanoparticles
چکیده انگلیسی

Nanosized phase pure powder of Ba(Zn1/3Ta2/3)O3 (BZT) was prepared by sol–gel method and subsequent pyrolysis of the dried gel. The powders were pyrolyzed at different elevated temperatures and the effect of pyrolysis temperature on particle size was investigated. The sinterability of BZT ceramics made from nanopowders was found to be very high. Hence the sintered microstructure shows very large grains. However sintered density and microwave dielectric properties of sintered nanopowders were found to be poor. Reason for the poor densification was found to be the formation of large amounts of intergranular porosity and drastic grain growth during sintering. The samples were sintered by muffling with calcined BZT powder. Different sintering additives were added to calcined nanosized powders and then sintered. Most of the dopants are found to promote grain growth of sintered microstructure. Some of the dopants are found to reduce temperature coefficient of resonant frequency to zero when the average ionic radius was about 0.615 Å.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 457, Issues 1–2, 12 June 2008, Pages 422–428
نویسندگان
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