کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1521435 | 1511813 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and low-temperature relaxor behavior of dense K2Nb4O11 ceramics derived from sol-gel route
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
High purity tetragonal tungsten-bronze type K2Nb4O11 fine powders were synthesized via an economical sol-gel route and the crystal structure was solved by Rietveld refinement of X-ray powder diffraction. Structural evolution during calcination was found to occur via translation of the edge shared octahedra into a corner sharing coordination. Using nano-structured powder as precursor, dense K2Nb4O11 ceramics were successfully fabricated by pressure-less sintering. This maiden achievement allowed for primary dielectric characterization of this ceramic compound. The quantitative analysis based on empirical parameters, ÎTm and γ, reveals a relaxor nature in the temperature region below 200 K. More remarkably, the dielectric constant and loss are almost frequency independent in the wide range of 1 Hz-1 MHz at room temperature and a high dielectric constant and low loss (Ér = 200 and tan δ = 0.007) makes them good materials for dielectric components for embedded capacitors and multilayer ceramic capacitors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volumes 149â150, 15 January 2015, Pages 418-423
Journal: Materials Chemistry and Physics - Volumes 149â150, 15 January 2015, Pages 418-423
نویسندگان
Lina Zhang, Yudong Hou, Mupeng Zheng, Mankang Zhu, Hui Yan,