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Pb(Mg1/3Nb2/3)O3-PbTiO3-BaTiO3 Complex Perovskite Ferroelectric Ceramics with High Dielectric Constant and Low Firing Temperature

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The effects of different firing temperatures on the stability of perovskite phase, grain size, and dielectric properties were investigated by XRD, TEM, SEM and dielectric measurements. The dielectric ceramics of Pb(Mg1/3Nb2/3)O3-PbTiO3-BaTiO3 system were obtained by chemical coprecipitation in water. The ceramics have higher dielectric constant (7003-9714), lower firing temperature (950-1150℃), quite uniform microstructure with grain size less than 2.5μm, and lower temperature coefficients of capacitance. As a result, it was confirmed that the simple and low cost chemical route used namely coprecipitation in water is a desired meth-od for preparing high property dielectric materials applicable to multilayer capacitors.
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D0I:10.13374/j.1ssnl001053x.2000.01.043 ·330· 北京科技大学学报 2000年第4期 4.95 MPa.mi of Silicon Carbide.Ceram Soc Bull,1973,52(2):170 (③)得到一个比较可行的固相烧结工艺:温3果世驹粉末烧结理论北京:治金工业出版社,198 度1950℃,保温1h,压力25MPa. 4高技术新材料要览编委会.高技术新材料要览.北京 中国科学技术出版社,1993.235 参考文献 5李世普.特种陶瓷工艺学武汉:武汉工业大学出版社, 1990.116 1黄汉铨,姚延厚,陈宏亮,等.添加元素在热压碳化硅材6 Young Wook Kim.Microtructure and Mechanical Proper- 料中的微观行为.粉未冶金技术,1991,9(2):70 ties of Sintered Silicon Carbide.J Am Ceram Soc,1998, 2 Nadeau J.The Role of Boron and Carbon in the Sintering 81(12):3139 Solid State Hot Pressing of SiC Ceramics WU Anhua,CAO Wenbin,MA Fang,LI Jiangtao,GE Changchueng Laboratory of Special Ceramics and P/M,UST Beijing,Beijing 100083,China ABSTRACT a-SiC ceramic was obtained by hot-pressing of a-SiC powders with B and C as additives.The relative density of the materials is 97.8%,which was hot-pressed at 1 900C and 25 MPa.The values of the flexural strength and fracture toughness reached 383 MPa and 4.95 MPa.m2 respectively.The densification mechanism was deduced. KEY WORDS silicon carbide;hot-pressing;solid state sintering *章奉孝素米*咨海*孝杂*姿章本案套幸在案条衣雀*※者者衣海本备省*者*在煮者条素春杂海本海海本章海*涤※者※餐*姿★条常**★本涤套孝※者本春*涤★者★★幸本杂幸★★ Pb(MgiaNb2)O,-PbTiO,-BaTiO,Complex Perovskite Ferroelectric Ceramics with High Dielectric Constant and Low Firing Temperature Ji Zhen,Xiao Zhigang,Liu Xiuqing,Ma Zhaozeng,Yu Zongsen Material Science and Engineering School,University of Science and Technology Beijing,Beijing 10008,China (Received 1999-11-01) Abstract:The effects of different firing temperatures on the stability of perovskite phase,grain size,and die- lectric properties were investigated by XRD,TEM,SEM and dielectric measurements.The dielectric ceramics of Pb(MgiaNbz)O,-PbTiO,-BaTiO,system were obtained by chemical coprecipitation in water.The ceramics have higher dielectric constant(7003-9714),lower firing temperature(950-1150C),quite uniform micro- structure with grain size less than 2.5 um,and lower temperature coefficients of capacitance.As a result,it was confirmed that the simple and low cost chemical route used namely coprecipitation in water is a desired meth- od for preparing high property dielectric materials applicable to multilayer capacitors. Key words:PMN-PT-BT;coprecipitation;dielectric property (From:Jourmal of University of Science and Techonlogy Beijing(Engiish Edition),2000,7(2):115)

北 京 科 技 大 学 学 报 年 第 期 · ,左 得 到 一 个 比较可 行 的 固相 烧 结工 艺 温 度 , 保温 , 压 力 参 考 文 献 黄汉锉 , 姚延 厚 , 陈宏亮 ,等 添加元素在热压碳化硅材 料 中的微观 行为 粉未冶金技术 , , 赶 , , 果世 驹 粉末烧结理 论 北 京 冶金工 业 出版社 , 高技术新材料要览编委会 高技术新材料要 览 北京 中国科学技术 出版社 , 李世普 特种陶瓷工 艺学 武汉 武汉工业大学出版社 , 权” 奴甘 , , 砰 , 肠 , 几阴 , 的, ” ” 邝涯 , , , 一 田刀 勿 一 一 , 切 · ,口 一 汹 仍 一 一 , , 石“ , , 几匆 , 刀 七 七 留 , , 只 一 一 如 叮 , , 曲 , , 幻。 刀 月州坛 一 一 , 一 , 力 权 , , 卿 , 加 , 几 加 七吐 一 一 尸 加 妙 舒 扩才雌 石心葱 云 , , DOI :10.13374/j .issn1001-053x.2000.04.043

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