کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1473811 991061 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of cation ordering and domain boundaries on low loss Ba(BI1/3BII2/3)O3 perovskite dielectrics revealed by high-angle annular dark-field scanning transmission electron microscopy (HAADF STEM)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
The effect of cation ordering and domain boundaries on low loss Ba(BI1/3BII2/3)O3 perovskite dielectrics revealed by high-angle annular dark-field scanning transmission electron microscopy (HAADF STEM)
چکیده انگلیسی

High quality ceramics of Ba((Co0.7Zn0.3)1/3Nb2/3)O3 (BCZN), Ba(Mg1/3Nb2/3)O3 (BMN) and Ba(Mg1/3Ta2/3)O3 (BMT) were prepared by the mixed oxide route using sintering temperatures up to 1620 °C. Products with a high degree of cation ordering exhibited dielectric Q × f values from 83,000 GHz (BCZN) to 360,000 GHz (BMT). High Resolution TEM and aberration-corrected scanning transmission electron microscopy (STEM) revealed ordering domains and type I, II and III boundary structures. High-Angle Angular Dark Field (HAADF) STEM images provided direct evidence of 1:2 ordering and stacking sequences, and the presence of disordered regions within domain boundaries. The exceptionally high Q × f values for BMT are associated with a high degree of B-site ordering and the removal of domain boundaries in large, single domain grains. The catastrophic degradation of Q × f values in BMN after prolonged sintering is associated with formation of a lossy ferroelectric secondary phase (Ba3Nb2O8), and changes to composition and stoichiometry of BMN grains.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 34, Issue 10, September 2014, Pages 2285–2297
نویسندگان
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