宽温区热释电陶瓷的复合烧结法与性能研究

The Study on Mixed Sintering Method and Properties of Pyroelectric Ceramics with Wide Temperature Range

富锆型PZT陶瓷在室温附近发生低温铁电三方相到高温铁电三方相的相变(FRL-FRH)相变并产生很大的热释电系数,相变过程中介电常数和损耗变化很小,相变温区很窄,相变温度随锆钛比的不同而不同。该文选取锆钛比为95/5和93.5/6.5的Mn掺杂PZT材料进行复合烧结,以期展宽相变温区。实验结果表明,两种初始原料1 100℃预处理后按照质量比1∶1进行复合烧结,相变温区得到了有效的展宽,在19～43℃内热释电系数p大于6.3×10-8 C/(cm2.℃),探测率优值FD大于7.7×10-5 Pa-1/2。通过对热释电、介电和铁电性能的综合研究,发现复合烧结在优化PZT陶瓷热释电性能的同时优化了其介电和铁电性能。

There is a famous FRI -FRH phase transition giving high pyroelectric coefficient with very little change in the dielectric constant and loss occurred near room temperature in Zr-rich PZT ceramics. However, the tempera ture range of this phase transition is very narrow and the transition temperature could be changed by the variation of the Zr/Ti ratio. In this paper, two kinds of Mn doped starting materials, those Zr/Ti ratio were 95/5 and 93.5/6.5 respectively, were mixed sintered in order to broaden the phase transition temperature. It was found that, the tem- perature range was successfully extended when the two starting materials were pre-treated at 1100℃ before mixed by the mass ratio of 1 ： 1. The pyroelectric coefficient p was higher than 6.3 ×10^-8 C/（cm2 . ℃） and the figure of merit FD was higher than 7.7 × 10^-8 Pa^-1/2 in the temperature range 19 ℃ to 43 ℃. The effects of mixed sintering on their pyroelectric,dielectric and ferroelectric properties have been comprehensively studied, and it was found that the dielectric and ferroelectric properties were also improved.