硅酸盐学报

无籽固相法生长的K0.5Na0.5NbO3基压电单晶预合成工艺、结构与性能

作者：宋嘉庚江民红李林严亚飞郝崇琰张津玮

单位：桂林电子科技大学材料科学与工程学院广西信息材料重点实验室广西桂林 541004

分类号：TBO78

出版年,卷(期):页码：2017,45(9):1271-1279

DOI：10.14062/j.issn.0454-5648.2017.09.07

摘要：

采用无籽固相晶体生长技术制备99.7(99.6K0.5Na0.5NbO3–0.4LiBiO3)–0.3CaZrO3无铅压电单晶，研究了预合成温度对合成粉末的特性以及后续生长的单晶生长特性、微结构、压电和介电性能的影响。结果表明：随着预合成温度的升高，合成粉末趋于形成更稳定的正交相结构，但粉末粒度和形貌没有明显变化。采用不同预合成温度合成的粉末均能制备出厘米级的单晶，晶体呈淡黄色半透明状。在研究范围内，预合成温度的变化对晶体的生长特性和晶体结构没有明显影响。但随着预合成温度的升高，晶体压电常数d33先增加后减小，当预合成温度为850 ℃时，达到最大值d33=284 pC/N。

Single crystal of 99.7(99.6K0.5Na0.5NbO3–0.4LiBiO3)–0.3CaZrO3 was prepared by a seed-free solid-state crystal growth method. The characteristics, microstructure, piezoelectric and dielectric properties of the single crystal at different pre-synthesis temperatures were investigated. The pre-synthesis powder has a more stable tetragonal phase structure, but its granularity and morphology have little change as the pre-synthesis temperature increases. The centimeter-sized single crystal was prepared with the pre-synthesized powder at different temperatures. The crystal appears semi-transparent with light yellow color. The growth characteristics and microstructure of single crystal have little change at different pre-synthesis temperatures. However, its piezoelectric properties firstly increase and then decrease with increasing the pre-synthesis temperature. The single crystal of 99.7(99.6K0.5Na0.5NbO3–0.4LiBiO3)–0.3CaZrO3 has the optimum piezoelectric constant (i.e., d33=284 pC/N) when the pre-synthesis temperature is 850 ℃.

基金项目：

国家自然科学基金(51562004；51571142；51102056)；广西自然科学基金杰出青年基金、面上和创新团队项目(2016GXNSFFA380007；2015GXNSFAA139276；2016GXNSFGA380001)；广西高校优秀人才支持计划；人社部留学人员科技活动项目择优资助(优秀类)基金资助。

作者简介：

宋嘉庚(1991—)，男，硕士研究生。

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