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用两步烧结法制备(K0.48–xNa0.52)(Nb0.93–xSb0.07)O3–xLiTaO3无铅压电陶瓷
作者:朱孔军 王道利 邵斌 裘进浩 季宏丽 
单位:南京航空航天大学 机械结构力学与控制国家重点实验室 南京 210016 
关键词:无铅压电陶瓷 掺杂改性 两步烧结 压电性能 铁电性能 
分类号:TM282
出版年,卷(期):页码:2011,39(12):48-53
DOI:
摘要:

用传统固相法制备(K0.48–xNa0.52)(Nb0.93–xSb0.07)O3–xLiTaO3体系无铅压电陶瓷,X射线衍射物相分析结果表明:该体系陶瓷正交–四方转变的准同型相界位于0.035<x<0.04,在室温具有较高的压电性能。用传统烧结方法很难得到致密的压电陶瓷,用两步烧结工艺可以得到致密化且晶粒尺寸均一的陶瓷,因此重点研究采用两步烧结技术对x = 0.037 5的陶瓷进行烧结工艺的改进和优化,研究微观组织结构与陶瓷压电性能之间的关系。最佳两步烧结工艺为:θ1 = 1 120 ℃,t1 = 10 min,θ2 = 1 000 ℃,t2 = 5 h。制备陶瓷的电学性能如下:压电常数d33 = 261 pC/N,机械品质因数Qm = 29,相对介电常数εr = 1 659,平面机电耦合系数kp = 0.47。

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Multi-component alkaline niobate (K0.48–xNa0.52)(Nb0.93–xSb0.07)O3–xLiTaO3 lead-free piezoelectric ceramics were successfully prepared by conventional solid-state method. Experimental results from X-ray diffraction patterns indicate that the existence of an orthorhombic-tetragonal morphotropic phase boundary at the composition of 0.035<x<0.04, exhibits a good piezoelectric coefficient at room temperature. However, it is not easily sintered by ordinary sintering technique. A two-step sintering process has been developed for preparing ceramics which can achieve densification without grain growth during the final sintering stage and results in a uniform grain size. So this work investigated the fabrication of lead-free ceramics with the optimal composition of x = 0.037 5 using two-step sintering method. The two-step sintering technique was optimized, and relationships between microstructure and piezoelectric properties were studied. Under the optimal sintering process: θ1 = 1 120 ℃, t1 = 10 min, θ2 = 1 000 ℃, t2 = 5 h, excellent properties of piezoelectric strain constant d33 = 261 pC/N, electromechanical quality factor Qm = 29, relative dielectric constant εr = 1 659, and electromechanical coupling coefficient kp = 0.47 were achieved.

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基金项目:
国家自然科学基金(50872053,50830201);教育部新世纪优秀人才支持计划(NCET-10-0070);教育部长江学者创新团队(IRT0968)及江苏高校优势学科建设工程资助项目
作者简介:
朱孔军(1971—),男,教授
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参考文献:

[1]  CROSS E. Lead-free at last [J]. Nature, 2004, 432: 24–25.
[2]  SHROUT T R, ZHANG S J. Lead-free piezoelectric ceramics: Alternatives for PZT? [J]. J Electroceram, 2007, 19: 111–124.
[3]  肖定全, 万征. 环境协调型铁电压电陶瓷[J]. 压电与声光, 1999, 21(5): 363—366.
XIAO Dingquan, WAN Zheng. Piezoelectfics Acoustooptics, 1999, 21(5): 363–366.
[4]  EGERTON L, DILLON D M. Piezoelectric and dielectric properties of ceramics in the system potassium–sodium niobate [J]. J Am Ceram Soc, 1959, 42(9): 438–442.
[5]  张利民, 张波萍, 李敬锋, 等. 无铅压电陶瓷铌酸钾钠的常压烧结及其电学性能[J]. 硅酸盐学报, 2007, 35(1): 1–5.
ZHANG Limin, ZHANG Boping, LI Jinfeng et al. J Chin Ceram Soc, 2007, 35(1): 1–5.
[6]  YANG Z P, CHANG Y F, WEI L L. Phase transitional behavior and electrical properties of lead-free (K0.44Na0.52Li0.04)(Nb0.96–xTaxSb0.04)O3 piezoelectric ceramics [J]. Appl Phys Lett, 2007, 90: 042911-1– 042911-3.
[7]  LI J F, WANG K. Ferroelectric and piezoelectric properties of fine- grained Na0.5K0.5NbO3 lead-free piezoelectric ceramics prepared by spark plasma sintering [J]. J Am Ceram Soc, 2006, 89(2): 706–709.
[8]  JAEGER R E, EGERTON L. Hot pressing of potassium–sodium niobates [J]. J Am Ceram Soc, 1962, 45(5): 209–213.
[9]  TAKAHASHI H, NUMAMOTO Y. Lead-free barium titanate ceramics with large piezoelectric constant fabricated by microwave sintering [J]. Jpn J Appl Phys, 2006, 45: L30–L32.
[10]  BIROL H, DAMJANOVIC D. Preparation and characterization of (K0.5Na0.5)NbO3 ceramics [J]. J Eur Ceram Soc, 2006, 26: 861–866.
[11]  CHEN I W, WANG X H. Sintering dense nanocrystalline ceramics without final-stage grain growth [J]. Nature, 2000, 404: 168–171.
[12]  WANG X H, DENG X Y, BAI H L. Two-step sintering of ceramics with constant grain-size,Ⅱ: BaTiO3 and Ni–Cu–Zn ferrite [J]. J Am Ceram Soc, 2006, 89(2): 438–443.
[13]  MAZAHERI M, ZAHEDI A M, SADRNEZHAAD S K. Two-step sintering of nanocrystalline ZnO compacts: Effect of temperature on densification and grain growth [J]. J Am Ceram Soc, 2008, 91(1): 56–63.
[14]  KARAKI T, YAN K, ADACHI M. Subgrain microstructure in high- performance BaTiO3 piezoelectric ceramics [J]. J Appl Phys Express, 2008, 1: 111402-1–111402-3.
[15]  ZOU T T, WANG X H, WANG H. Bulk dense fine-grain (1–x)BiScO3– xPbTiO3 ceramics with high piezoelectric coefficient [J]. Appl Phys Lett, 2008, 93: 192913-1–192913-3.
[16]  SAITO Y, TAKAO H, TANI T, et al. Lead-free piezoceramics [J]. Nature, 2004, 432: 84–87.
[17]  GUO Y P, KAKIMOTO K I, OHSATO H. (Na0.5K0.5)NbO3–LiTaO3 lead-free piezoelectric ceramics [J]. J Mater Lett, 2005, 59: 241–244.
[18]  WANG Y Y, WU J G., XIAO D Q. Microstructure, dielectric, and piezoelectric properties of (Li, Ag, Ta) modified (K0.5Na0.5)NbO3 lead-free ceramics with high Curie temperature [J]. J Appl Phys, 2007, 102: 054101-1–054101-5.
[19]  WU J G, PENG T, WANG Y Y, et al. Phase structure and electrical properties of (1–x)(K0.48Na0.52)(Nb0.95Ta0.05)O3–xLiSbO3 lead-free piezoelectric ceramics [J] . J Am Ceram Soc, 2008, 91(1): 319–321.
[20]  SHEN Z Y, ZHEN Y H, WANG K, et al. Influence of sintering temperature on grain growth and phase structure of compositionally optimized high-performance Li/Ta-modified (Na,K)NbO3 ceramics [J]. J Am Ceram Soc, 2009, 92(8): 1748–1752.
[21]  ARLT G., HENNINGS D,WITH G D. Dielectric propertiesof fine- grained barium titanate ceramics [J]. J Appl Phys, 1985, 58(4): 1619–1625.
 

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