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1.引言 由于PbTiO_3压电陶瓷较难合成,因而使它的推广应用比PZT陶瓷晚。但是由于它的介电常数ε小(200左右),居里温度高(490℃),故在高频器件、红外器件等方面有应用前途。目前应用较广的(Ba,Pb)TiO_3-PTC陶瓷的转变温度就是利用PbTiO_3的高温特性来提高的。 本文介绍的是利用PbTiO_3的介电常数小、Kt大和频率稳定度高的特点,把它用作滤
1. Introduction Since PbTiO_3 piezoelectric ceramics are more difficult to synthesize, their application has been delayed later than PZT ceramics. However, due to its small dielectric constant ε (around 200) and high Curie temperature (490 ℃), it has a promising future in high-frequency devices and infrared devices. At present, the transition temperature of (Ba, Pb) TiO_3-PTC ceramics is increased by using the high temperature characteristic of PbTiO_3. This article describes the use of PbTiO_3 small dielectric constant, Kt large and high frequency stability of the characteristics of its use as a filter