PTC铁电半导体陶瓷

• 作 者: 黄仲臧
• 机 构: 中国科学院上海硅酸盐研究所,
• 出 处: 仪表材料
• 发表日期: 1981年01期
• 关键词: 陶瓷材料 室温电阻率 铁电半导体 PTC 负温度系数 施主杂质 电容器陶瓷 钡离子 陶瓷样品 铁电陶瓷

一、前言十多年来,一种新型的陶瓷材料——PTC(Positive Temperature Coefficient ofResistivity)铁电半导体陶瓷——获得了迅速的发展。这种陶瓷材料具有非常特殊的电阻率随温度变化的特征:室温下,它是半体导,随着温度的升高,电阻率稍有降低,显现了负温度系数,当达到一定温度时,电阻车急剧地增加几个数量级,而变成为绝缘体,如图1所示。据最近资料报道,这一电阻率的突变已达到7～8个数量级。这种电阻率随温度的变

I. Introduction For more than a decade, a new type of ceramic material, PTC (Positive Temperature Coefficient of Resistivity) ferroelectric semiconductor ceramics, has enjoyed rapid development. This ceramic material has a very special characteristic of resistivity with temperature changes: at room temperature, it is a half-body guide, with the temperature increases, the resistivity slightly decreased, showing a negative temperature coefficient, when a certain temperature, The resistance car increases sharply by several orders of magnitude and becomes an insulator, as shown in Figure 1. According to recent data reports, this resistivity mutation has reached 7 to 8 orders of magnitude. This resistivity varies with temperature