Highlights from the SGO's 39th Annual Meeting on Women's Cancer

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• 作者：Lee-may Chen ; Johnathan M. Lancaster
• 关键词：Ceramics ; Microstructure ; Piezoelectric properties
• 刊名：Gynecologic Oncology
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：109
• 期：2
• 页码：166-167
• 全文大小：90 K

文摘

Lead-free ceramics (K_0.5Na_0.5)(Nb_0.9Ta_0.1)O₃ (KNNT) + x mol % K₄CuNb₈O₂₃ (KCN) + y mol % MnO₂ have been prepared using the conventional solid-state reaction technique. Crystalline structures and Microstructures were analyzed by X-ray diffraction and scanning electron microscope (SEM) at room temperature. The low dielectric loss tanδ and relatively high piezoelectric properties were obtained when KCN and MnO₂ were added into KNNT ceramics. The ceramics with x = 1.0, y = 0.50 exhibited excellent piezoelectric properties: high mechanical quality factor Q_m = 1563, piezoelectric coefficient d₃₃ = 96pC/N, electromechanical coupling coefficient k_p = 42.2 % , k_t = 44.5 % , k₃₃ = 58.4 % , relative dielectric constant ε′ = 308, tanδ = 0.4 % . This material is a promising candidate for the lead-free piezoelectric transformer applications.