摘要
以熔盐法制备的K4Nb6O17片状粉体为前驱体,通过质子取代法制备了片状Nb2O5粉体,并且以其为模板结合模板晶粒生长(TGG)技术制备出较高织构度的K0.5Na0.5NbO3(KNN)织构化无铅压电陶瓷,研究了不同工艺参数(模板含量、烧结温度和保温时间)对KNN织构化陶瓷的显微结构、介电性能以及压电性能的影响规律。研究结果表明:当模板含量、烧成温度和保温时间分别为10wt%,1120℃和5 h时,可以获得织构度f为0.78的KNN织构化无铅压电陶瓷,并具有优异的压电和介电性能:平行于流延方向压电常数d33=141 pC/N,介电常数εT33/ε0=503和平面机电耦合系数k p=39.7%;垂直于流延方向d33=112 pC/N,εT33/ε0=454和k p=37.5%。
The Nb2O5 plate-like particles were synthesized by proton replace method from the precursor particles K4Nb6017 which synthesized by molten salt method. The high orientation degrees potassium sodium niobate K0.5 Na0.5 NbO3 （KNN） textured ceramic were fabricated by tape casting process which used Nb2O5 plate-like powder as template particles. The influence of different process parameters which were template content, sintering temperature and soaking time on the microstructure, dielectric and piezoelectric properties of the ceramic was studied. The results showed that the optimized orientation degree f is 0.78, piezoelectric properties and dielectric properties of the textured ceramic could be obtained when the template content, sintering temperature and soaking time were 10wt%, 1120 ℃ and 5 h, respectively. On parallel tape-casting direction the piezoelectric constant d33 reaches 141 pC/N, dielectric constant εT33/ε0 is 503 and planar electromechanical coupling factor kp is 39.7%, and on perpendicular tape-casting direction the d33 112 pC/N, εT33/ε0 = 454 and kp = 37.5 %, respectively.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第10期2043-2048,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(51262011
50962007)
江西省自然科学基金(20114BAB206023)
江西省主要学科学术和技术带头人培养计划(2010DD01100)
江西省教育厅科技项目(GJJ12508)
景德镇市学科带头人项目
