Structure and electrical properties of textured Sr_1.85Ca_0.15NaNb₅O₁₅ ceramics prepared by the reactive templated grain growth

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• 作者：Lingling Wei^a ; ^b ; Xiaolian Chao^a ; Xiaokun Han^a ; Zupei Yang^a ; ^{yangzp@snnu.edu.cn" class="auth_mail}
• 关键词：A. Ceramics ; C. X-ray diffraction ; D. Dielectric properties ; D. Ferroelectricity ; D. Piezoelectricity
• 刊名：Materials Research Bulletin
• 出版年：April, 2014
• 年：2014
• 卷：52
• 期：Complete
• 页码：65-69
• 全文大小：1210 K

文摘

Highly textured Sr_1.85Ca_0.15NaNb₅O₁₅ (SCNN) ceramics with enhanced electrical properties were successfully prepared by the reactive templated grain growth method using acicular Sr₂KNb₅O₁₅ (SKN) template particles. Through carefully controlling the processing conditions, a texture fraction of 0.88 was obtained when the ceramics were sintered at 1340 掳C for 6 h. The obtained textured SCNN ceramics exhibited obvious anisotropic properties with the highest electrical properties shown in c-axis direction: 蓻_r = 2270, 蓻_m = 5902, T_c = 247 掳C, tan 未 = 0.014, P_r = 16.88 渭C/cm² and d₃₃ = 162 pC/N. These properties were superior to those of randomly oriented SCNN ceramics with the same composition, showing that fabricating lead-free ceramics through reactive templated grain growth method is an effective way to achieve superior performance for commercial application. In addition, the formation mechanism of higher texture quality in SCNN ceramics was discussed in detail.