کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5440275 | 1398226 | 2017 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of non-stoichiometry on the densification, phase purity, microstructure, crystal structure, and dielectric loss of Ba(Co1/3Nb2/3)O3 ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The structural, vibrational, densification, and microwave properties of Ba(Co1/3Nb2/3)O3 ceramics with small compositional variations along several tie lines in the ternary BaOCoONb2O5 diagram were studied. The results showed that very small deviation from stoichiometric Ba(Co1/3Nb2/3)O3 composition has profound effect on QÂ ÃÂ f, degree of ordering, densification, and phase assemblage. The 0.94 Ba(Co1/3Nb2/3)O3-0.06 Ba5Nb4O15 ceramic has the highest QÂ ÃÂ f value (71Â THz) - a value two times larger than that of stoichiometric Ba(Co1/3Nb2/3)O3 (36 THz). Transformation from the (partial) disordered distribution of Co and Nb cations to 1:2 ordered arrangement in the octahedral sites was found to increase the Q factor of the high density and single phase ceramics. It was also observed that formation of very small amount of Ba9CoNb14O45 second phase degraded QÂ ÃÂ f value severely for the dense and highly ordered Nb-rich and Ba-deficient ceramics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 37, Issue 10, August 2017, Pages 3335-3346
Journal: Journal of the European Ceramic Society - Volume 37, Issue 10, August 2017, Pages 3335-3346
نویسندگان
Ahmad Sayyadi-Shahraki, Ehsan Taheri-Nassaj, Justin Gonzales, Nathan Newman, Taras Kolodiazhnyi,