(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；
2. 哈尔滨工业大学 深圳研究生院 材料科学与工程学科部，深圳 518055)
摘 要: 采用固相反应合成法制备稀土Nd掺杂0.942(Na0.53K0.47)NbO3-0.058LiNbO3(KNNLN)无铅压电陶瓷。采用XRD、红外和拉曼等方法对其结构进行表征，并测试其介电性能。结果表明：掺杂稀土Nd能够有效地固溶到KNNLN基体中； Nd掺杂通过Nb位替代而扰乱了Nb-O6键并使得其强度变弱，进而导致KNNLN样品的相结构变化。Nd掺杂量在1%~2%时，样品中出现了四方相和立方相共存区；随着Nd掺杂量的进一步增加，KNNLN的晶体结构发生从四方和斜方相共存向四方和立方相共存的连续变化；稀土Nd掺杂能够明显地提高样品的室温介电常数并在一定程度上降低KNNLN基陶瓷的室温介电损耗。2%Nd掺杂KNNLN压电陶瓷样品的压电系数d33和介电常数εr值分别约为128 pC/N和694。相比之下，未掺杂KNNLN压电陶瓷的d33和εr值分别约为87 pC/N和545。
关键字: Nd；铌酸钠钾；无铅压电陶瓷；压电性能
（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
