碱金属铌酸盐无铅压电陶瓷的介电和压电性研究  

Dielectric and Piezoelectric Properties of Alkali Niobate Ceramics

作　　者：吴玲[1] 任晓峰[1] 张家良[1] 王春雷[1] 王矜奉[1] 

机构地区：[1]山东大学物理与微电子学院,济南250100

出　　处：《四川大学学报（自然科学版）》2005年第S1期306-310,共5页Journal of Sichuan University(Natural Science Edition)

摘　　要：采用普通的固相反应烧结方法制备了(KxNa1-x)NbO3(KNN,x=0.40～0.70)和(Na0.485K0.485Li0.03)(Nb0.80Ta0.20)O3(NKLNT)陶瓷,研究了它们的介电和压电性能.发现KNN陶瓷的室温下的压电常数d33在0.4≤x≤0.65范围基本不依存于K和Na间的组分比、分布在100～130pC/N之间,而与陶瓷密度密切相关,但介电常数和介电损耗则随K组分含量的增加而降低.NKLNT陶瓷呈现出较高的d33,kp和kt值,然而介电损耗较大.添加了适量烧结助剂K5.4Cu1.3Ta10O29(KCT)的KLNT-KCT陶瓷致密度有显著的提高,相对密度大于96%,呈现出良好的压电性能,其d33达到215pC/N,kp=48%,kt=47%,tgδ≤0.75%.研究表明碱金属铌酸盐陶瓷是一类有发展前景的无铅压电材料.(K_ x Na_ 1-x )NbO_ 3 (KNN, x=0.40～0.70) and (Na_ 0.485 K_ 0.485 Li_ 0.03 )(Nb_ 0.80 Ta_ 0.20 )O_ 3 _ (NKLNT) ceramics are prepared using traditional solid-state reaction method, and their dielectric and piezoelectric properties are investigated. Further, the efficiency of a sintering aid K_ 5.4 Cu_ 1.3 Ta_ 10 O_ 29 (KCT) is examined for NKLNT. The results show that the piezoelectric constant d_ 33 has little dependence on the compositional ratio between K and Na within 0.4 ≤ x ≤ 0.65 in KNN, distributing i...

关 键 词：无铅压电陶瓷 碱金属铌酸盐 烧结助剂 

分 类 号：O482.4[理学—固体物理]