摘要
铌镁酸铅-钛酸铅[Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3),PMN-PT]陶瓷是一种典型的驰豫铁电体。为了研究晶粒尺寸对PMN-PT陶瓷介电性能的影响,采用两步固相反应法合成了0.8PMN-0.2PT粉体,使用放电等离子烧结技术在不同温度下制备0.8PMN-0.2PT陶瓷,并分析了陶瓷的晶体结构、微观形貌和介电性能。结果表明:采用两步法能得到纯0.8PMN-0.2PT粉体,其晶粒尺寸约为0.36μm;当烧结温度为1100℃时,采用放电等离子烧结技术可以得到晶粒细小的纯0.8PMN-0.2PT陶瓷,晶粒尺寸约为0.69μm,密度为8.02 g/cm^(3),但是其介电常数较低,最大值为12708,介电-顺电转变峰为一个较宽的峰,且随频率增加,介电-顺电转变温度(T_(c))向高温方向移动,呈现典型的弛豫特性。此外,在频率为1×10^(2)~2×10^(6)Hz时,随温度升高,介电常数和介电损耗都升高。因此,采用放电等离子烧结法可以得到细晶致密且介电常数较高的0.8PMN-0.2PT陶瓷。
Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)(PMN-PT,lead magnesium niobate-lead titanate)ceramic is a typical relaxor ferroelectric material.In order to investigate the effect of grain size on the dielectric properties of PMN-PT ceramics,0.8PMN-0.2PT powder was synthesized using a two-step solid-state reaction method and 0.8PMN-0.2PT ceramics were prepared using a spark plasma sintering at different temperatures.The crystal structure,microstructure,and dielectric properties of the ceramics were analyzed.The results showed that pure 0.8PMN-0.2PT powder could be obtained by the two-step reaction method,and the grain size of the powder was about 0.36μm.When the sintering temperature was 1100℃,pure 0.8PMN-0.2PT ceramics with fine-grained was obtained by spark plasma sintering.The grain size was about 0.69μm,the density was 8.02 g/cm^(3),but the dielectric constant was low,with the maximum value of 12708.The dielectric-paraelectric transition peak was a very broad peak.With the increase of frequency,the dielectric-paraelectric transition temperature(T_(c))moved towards the higher temperature,showing a typical relaxation characteristics.In addition,in the frequency range of 1×10^(2)to 2×10^(6)Hz,both dielectric constant and dielectric loss were increased with increasing temperature.Therefore,dense 0.8PMN-0.2PT ceramics with fine-grained and high dielectric constant could be obtained by spark plasma sintering.
作者
李磊
李岳磊
刘邦先
LI Lei;LI Yuelei;LIU Bangxian(Zhengzhou Technical College,Zhengzhou 450121,China;Zhengzhou University of Technology,Zhengzhou 450044,China)
出处
《无机盐工业》
CAS
CSCD
北大核心
2024年第11期139-144,共6页
Inorganic Chemicals Industry
基金
河南省高等学校重点科研项目计划支持项目(24A460028)。
关键词
铌镁酸铅-钛酸铅陶瓷
两步反应法
放电等离子烧结
细晶
介电性能
lead magnesium niobate-lead titanate ceramic
two-step reaction method
spark plasma sintering
fine-grained
dielectric properties
