کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7888778 1509795 2018 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Crystal structure and electrical properties of (Li, Ce, Nd)-multidoped CaBi2Nb2O9 high temperature ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Crystal structure and electrical properties of (Li, Ce, Nd)-multidoped CaBi2Nb2O9 high temperature ceramics
چکیده انگلیسی
(Li, Ce, and Nd)-multidoped CaBi2Nb2O9 (CBN) Aurivillius phase ceramics were prepared via a conventional solid-state sintering route. The crystal structure including bond lengths and bond angles, microstructure, dielectric constant, DC resistivity, and piezoelectric properties were systematically investigated. Rietveld-refinements of X-ray results indicated that small quantity of (Li, Ce, Nd) doping (< 2.5 mol%) increases orthorhombic distortion, because of the smaller ionic radii of doping ions. However, orthorhombic distortion obviously decreased with increasing (Li, Ce, Nd) doping concentration from 5 to 25 mol%. The replacement of asymmetric A-site Bi3+ with 6s2 lone pair electrons by symmetric Li+, Ce3+ and Nd3+ ions decreased the orthorhombic distortion. The morphologies and electrical properties of sintered ceramics were tailored by the introducing (Li, Ce, Nd) multi-dopants. The improvement of piezoelectric properties of modified-CBN ceramics were attributed to decreasing grain sizes and morphotropic phase boundary (MPB). Ca0.85(Li0.5Ce0.25Nd0.25)0.15Bi2Nb2O9 (CBNLCN-15) ceramics had optimum properties, and d33 and Tc values were found to be ~ 13.1 pC/N and ~ 900 °C, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 3, 15 February 2018, Pages 3069-3076
نویسندگان
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