The invention discloses a high dielectric Y5V type three rare earth doped barium titanate ceramic material and its preparation method, the material has a cubic perovskite structure by chemical formula ABO: 3 said, cubic crystal containing BaTiO: 3 and three kinds of rare earth additive phase, which contains 3 components: BaTiO more than three kinds of rare earth elements 94mol%, Re as A and B additives; its content is less than 5mol%, the preparation steps of proportioning, mixing, grinding, drying, pre sintering, the sintering material after crushing, fine grinding, drying, grinding, pressing, molding and glue sintering, polishing, the ceramic material. The room temperature dielectric rate is greater than 10000, excellent performance, this is the only rare earth doped barium titanate ceramics with high dielectric Y5V capacitors in the field of material technology process Broken and realized, is material from the micro crystal structure and defect chemistry design a theoretical breakthrough, this breakthrough is of great value in improving macro dielectric properties of materials, the amount of rare earth low utilization rate increased significantly.
【技术实现步骤摘要】
本专利技术涉及一种电容器用材料,更具体地说,涉及一种高介电Y5V型三 稀土掺杂钛酸钡陶瓷材料。
技术介绍
随着电子工业的飞速发展, 一个在电子器件领域的连续最小化倾向需要 愈来愈高的介电体效率,可以通过两个方式实现(1)提高介电常数;(2) 减小晶粒尺寸。钛酸钡是具有最高介电常数的简单化合物,室温介电常数大 约1600,统治性地用作高介电电容器材料。虽然通过不同合成方法与晶粒尺 寸的控制,室温介电常数提高到6000左右,但仍未克服如较高的温度系数、 高介电损耗、和随电压与频率的不稳定性等许多不受欢迎的性质。裉据国际电子工业协会EIA (Electronic Industries Association)标准,Y5V 型是指以25 r的电容值为基准,在温度从-30 'C到+85 r的范围内,容温变 化率介于+22 % ~ -82 %。 Y5V型材料可分为两大类一类是由对环境有害的 含铅铁电体组成,另一类是环境友好型、以BaTiQj的固溶体为基材的非铅系 铁电体组成。并且后者机械强度、抗老化性能、可镀性以及可靠性均优于前 者,因此,通过掺杂对BaTi03的结构修改而 ...
【技术保护点】
一种高介电Y5V型三稀土掺杂钛酸钡陶瓷材料,其特征在于,具有由化学式ABO↓[3]表示的立方钙钛矿结构,含有BaTiO↓[3]作为主要成份,三种稀土元素Re作为A位和B位的立方结晶相,其中BaTiO↓[3]成份≥94mol%;三种稀土元素Re作为A位填加剂≤5mol%;三种稀土元素Re作为B位填加剂≤5mol%;稀土元素包括镧、铈、镨、钕、钐、铕、铡、铽、镝、钬、铒、镱、镥。
【技术特征摘要】
【专利技术属性】
技术研发人员:路大勇,孙秀云,
申请(专利权)人:吉林化工学院,
类型:发明
国别省市:22[中国|吉林]
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