摘要
目的研究钛过量对溶胶-凝胶法制备的掺钕钛酸钡粉体及其陶瓷的相组成、显微结构和介电性能的影响.方法采用溶胶-凝胶法制备BaNd0.01Ti1.02O3纳米晶粉体及其陶瓷,通过TEM,SEM,XRD等对钛酸钡基纳米晶粉体及其陶瓷的相组成和显微结构进行了表征,并测定陶瓷的介电性能.结果溶胶-凝胶法合成出BaNd0.01Ti1.02O3纳米晶粉体(35～50nm),主晶相为立方相,在1 350℃/2h烧结后为四方相细晶陶瓷,其居里温度为100℃,最大介电常数为8 596,介电损耗为0.014.结论溶胶-凝胶法可制得BaNd0.01Ti1.02O3纳米晶粉体及其细晶陶瓷,钛过量可改善陶瓷的微观形貌和介电性能.
Aim The influence of excess TiO_2 on phase composition, microstructure and dielectric properties of Nd-doped barium titanate ceramics by Sol-gel method were studied. Methods The BaNd_(0.01)Ti_(1.02)O_3 nanocrystalline powders and ceramics were prepared by Sol-gel method. The phase composition and microstructure of BaTiO_3 based an powders and ceramics were characterized by XRD, SEM and TEM methods and the dielectric properties were determined. Results The results showed that the powders synthesized by Sol-gel method were nanometer(35～50nm) and were mainly composed of cubic barium titanate phase. The derived ceramics sintered at 1 350℃ for 2h were composed of fine-grained tetragonal BaTiO_3 phase. The Curie temperature of the BaNd_(0.01)Ti_(1.02)O_3 ceramics was 100℃ with the dielectric constant of 8 596 and the dielectric loss of 0.014. Conclusion The BaNd_(0.01)Ti_(1.02)O_3 nanocrystalline powders and its fine-grained ceramics were prepared by Sol-gel method and the excess TiO_2 for Nd-doped BaTiO_3 ceramics is very good for the modification of ceramics′ microstructure and dielectric properties.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第3期299-302,共4页
Journal of Northwest University（Natural Science Edition）
基金
陕西省教育厅纳米专项招标课题基金资助项目(02JN1-8)
陕西省教育厅专项科研基金资助项目(02JK058)
关键词
溶胶-凝胶法
介电性能
纳米材料
钛酸钡
掺杂
Sol-gel method
dielectric properties
nanometer materials
barium titanate
doping
