【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1350℃/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8596,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。更多还原

【Abstract】 Aim The influence of excess TiO₂ on phase composition, microstructure and dielectric properties of Nd-doped barium titanate ceramics by Sol-gel method were studied. Methods The BaNd_0.01Ti_1.02O₃ nanocrystalline powders and ceramics were prepared by Sol-gel method. The phase composition and microstructure of BaTiO₃ 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 BaTiO₃ phase. The Curie temperature of the BaNd_0.01Ti_1.02O₃ ceramics was 100℃ with the dielectric constant of 8 596 and the dielectric loss of 0.014. Conclusion The BaNd_0.01Ti_1.02O₃ nanocrystalline powders and its fine-grained ceramics were prepared by Sol-gel method and the excess TiO₂ for Nd-doped BaTiO₃ ceramics is very good for the modification of ceramics′ microstructure and dielectric properties.更多还原