抗還原X9R介電陶瓷微結構及性質研究

本研究是利用複合材料之觀點作為介電材料設計以及研究其介電性質，以不同居禮點之介電材料混合達到介電性質相互補償，抑制鐵電材料在居禮點的介電峰以達到穩定其介電曲線。本研究使用之介電材料為BaTiO3，經由添加等莫爾比Li2CO3及Ta2O5後，於高溫燒結形成複合介電陶瓷體。隨著Li2CO3及Ta2O5添加量增加可有效的抑制介電性質對溫度之曲線，以及降低介電損失，當添加量每增加5 mol%可提高應用溫度-55oC之電容溫度係數(Temperature Coefficient of Capacitance, TCC)約3%，及200oC之TCC可提高約6 ~ 8%，但介電常數降低約150 ~ 300。當添加量在25 mol%以上可符合電子工業協會(Electronic Industries Association, EIA)標準中X9R規格(應用溫度範圍-55oC ~ 200oC，電容溫度係數ΔC/C ≦ ±15%)。(1-x)BT-(x/2)Li2CO3-(x/2)Ta2O5複合介電陶瓷材料擁有良好之絕緣性，在室溫下電阻係數可達1013 Ω-cm，高溫200oC時的電阻係數也維持著1012 Ω-cm。

關鍵字

鈦酸鋇； X9R ；積層陶瓷電容；複合介電陶瓷；碳酸鋰；氧化鉭

並列摘要

In this research, a design of the dielectric material and its dielectric properties were studied in a composite materials view. By mixing dielectric materials with different Curie point, the Curie peaks of ferroelectric materials at the Curie point were inhibited to achieve stable dielectric curves. In this study, the raw material barium titanate (BaTiO3) was sintered with a same molar ratio of Li2CO3 and Ta2O5 at high temperature for 2 hours. With the addition amount of Li2CO3 and Ta2O5 increased, the sensitivity of dielectric property to temperature decreased, and reduced dielectric loss. With each additional 5 mol%, the Temperature Coefficient of Capacitance (TCC) would increased about 3% at -55oC, and increased 6~8% at 200oC. But the dielectric constant decreased about 150~300. When the additive reach more than 25 mol%, this capacitor could satisfy X9R specifications of the Electronics Industry Association (EIA) standard, namely an operating temperature range of the capacitor is between -55 to 200°C, and with TCC shift limited to 15%.((1-x)BT-(x/2)Li2CO3-(x/2)Ta2O5 ) is good insulator, the resistivity up to 1013 Ω-cm at room temperature ,and resistivity in the high temperature 200°C to maintain 1012 Ω-cm.

並列關鍵字

BaTiO3 ； X9R materials ； MLCCs ； Li2CO3 ； Ta2O5

參考文獻

[1] 謝宗諭，額外添加Ba2+於(Ba,Ca)(Ti,Zr)O3系統的顯微結構、晶體結構及介電性質，碩士論文，國立成功大學資源工程研究所，台南， 2010年。

[2] B. Jaffe, W. R. Cook Jr., and H. Jaffe, Piezoelectric Ceramics, Academic Press, London (1971).

[3] N. Wada, and T. Hiramatsu, “Investigation of grain boundaries influence on dielectric properties in fine-grained BaTiO3 ceramics without the core–shell structure, ” Ceramic International, 34, pp. 933-937, (2008).

[4] I. Burn, “Mn-doped polycrystalline BaTiO3, ” Journal of Materials Science, 14, pp. 2453-2458, (1979).

[5] S. Sumita, M. Ikeda, Y. Nakano, K. Nishiyama, and T. Nomura, “Degradation of Multilayer Ceramic Capacitors with Nickel Electrodes,” Journal of the American Ceramic Society, 74, pp. 2739-2746, (1991).

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抗還原X9R介電陶瓷微結構及性質研究

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