锰掺杂对PMN-PT陶瓷介电和压电特性的影响  

Effect of Mn Dopant on Dielectric and Piezoelectric Properties of PMN-PT Ceramics

作　　者：谈鸿恩[1] 庄志强[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《材料导报》2007年第F11期345-347,共3页Materials Reports

摘　　要：采用氧化物固相反应法制备了Mn掺杂0.67Pb(Mg_(1/3)Nb_(2/3))O_3-0.33PbTiO_3陶瓷,研究了锰掺杂量时陶瓷相结构、介电和压电性能的影响。实验发现,随着锰掺杂量的增加,陶瓷焦绿石相含量的逐渐较少,材料变"硬"。即当锰掺杂量少于1.5mol%时,介电系数ε、压电常数d_(33)和机械品质因数Q_m逐渐增加,介电损耗tanδ减少。随着锰掺杂量的进一步增加,弛豫程度变得更加明显。当压电陶瓷组分中锰掺杂量为1.5mol%时,其介电和压电性能各为:ε=2300,K_p=0.54,Q_m=900,tantδ=0.004,d_(33)=400pC/N,适于制作大功率压电陶瓷变压器。Mn-doped 0.67Pb（Mgl/3Nb2/3）O3-0.33PbTiO3 ceramics are prepared by an oxide solid state reaction method. The phase structure,dielectric and piezoelectric properties of the ceramics are studied. It is demonstrated from the experiments that the content of pyrochlore phase decreases and the ceramics get hardened with the increase of Mn composition, The dielectric constant e, piezoelectric constant d33 and electro-mechanical quality factor Qm increase, but the dielectric loss tanδ decreases with Mn composition increasing when Mn composition is less than 1.5mol%. The ferroelectric behavior gets more diffused when the content of Mn-dopant is large than 1.5mol%. ε,kp ,Qm, tanδ and d33 of the ceramic doped with 1.5mol% Mn are 2300,0.54,900,0.004 and 400pC/N respectively. The ceramics could be used for the preparation of high power piezoelectric transformer.

关 键 词：压电陶瓷 PMN-PT Mn相结构 介电 压电 

分 类 号：TQ174.758.11[化学工程—陶瓷工业] TM221.014[化学工程—硅酸盐工业]