(1. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 哈爾濱工業(yè)大學(xué) 深圳研究生院 材料科學(xué)與工程學(xué)科部，深圳 518055)
摘 要: 采用固相反應(yīng)合成法制備稀土Nd摻雜0.942(Na0.53K0.47)NbO3-0.058LiNbO3(KNNLN)無(wú)鉛壓電陶瓷。采用XRD、紅外和拉曼等方法對(duì)其結(jié)構(gòu)進(jìn)行表征，并測(cè)試其介電性能。結(jié)果表明：摻雜稀土Nd能夠有效地固溶到KNNLN基體中； Nd摻雜通過(guò)Nb位替代而擾亂了Nb-O6鍵并使得其強(qiáng)度變?nèi)酰M(jìn)而導(dǎo)致KNNLN樣品的相結(jié)構(gòu)變化。Nd摻雜量在1%~2%時(shí)，樣品中出現(xiàn)了四方相和立方相共存區(qū)；隨著Nd摻雜量的進(jìn)一步增加，KNNLN的晶體結(jié)構(gòu)發(fā)生從四方和斜方相共存向四方和立方相共存的連續(xù)變化；稀土Nd摻雜能夠明顯地提高樣品的室溫介電常數(shù)并在一定程度上降低KNNLN基陶瓷的室溫介電損耗。2%Nd摻雜KNNLN壓電陶瓷樣品的壓電系數(shù)d33和介電常數(shù)εr值分別約為128 pC/N和694。相比之下，未摻雜KNNLN壓電陶瓷的d33和εr值分別約為87 pC/N和545。
關(guān)鍵字: Nd；鈮酸鈉鉀；無(wú)鉛壓電陶瓷；壓電性能
（1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;
2. Division of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology,
Shenzhen 518055, China）
Abstract:The Nd doped 0.942(Na0.53K0.47)NbO3-0.058LiNbO3 (KNNLN) lead-free piezoceramics were prepared by the solid reaction method. The structure, phase transition and electrical properties were studied by XRD, infrared spectra and Raman spectra. The results show that the single phase perovskite is dominant in these samples. The continuous change of the bond of NbO6 is closely related to B-site Nd substitution in KNNLN. The successive phase transitions from tetragonal to orthorhombic, and then to cubic are observed in Nd doped KNNLN ceramics. The piezoelectric constant (d33) and dielectric constant (εr) are significantly improved by Nd doping due to the appearance of phase coexistence zone. The highest d33 of 128 pC/N appears in 2% Nd doped ceramics and its dielectric constant εr is 694. In contrast, the values of d33 and εr of undoped KNNLN are 87 pC/N and 545, respectively.
Key words: Nd; K0.5Na0.5NbO3; lead-free piezoceramics; piezoelectric property
