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采用溶胶-凝胶(Sol-Gel)法制备了Ti/Ba=1.02的掺镍钛酸钡纳米晶粉体及其陶瓷。通过XRD、SEM和TEM对掺镍钛酸钡基粉体及陶瓷进行表征,并测定了陶瓷的介电性能。结果表明:Ti/Ba=1.02的掺镍钛酸钡基粉体约40 nm,主要相组成为立方相钛酸钡,并有少量的碳酸钡,经烧结后全部转化为四方相钛酸钡。掺镍明显降低了钛酸钡基陶瓷的烧结温度(约降低100℃);随着掺镍量的增大,陶瓷粒径先增大后减小,掺镍量mol比为3.0%时陶瓷εm大(5 571),并且tanδ小(0.011);与Ti/Ba=1.00的掺镍钛酸钡陶瓷相比,钛过量掺镍钛酸钡陶瓷粒径细小,ε-T谱峰值降低。
Barium-doped barium titanate nanocrystalline powders with Ti / Ba = 1.02 and their ceramics were prepared by sol-gel method. The XRD, SEM and TEM were used to characterize the barium-doped barium titanate-based powders and ceramics, and the dielectric properties of the ceramics were measured. The results show that the barium titanate-based powders with Ti / Ba = 1.02 are about 40 nm. The main phases are cubic barium titanate and a small amount of barium carbonate. After sintering, all the barium titanate barium titanate is transformed into tetragonal barium titanate. The sintering temperature of BaTiO3-based ceramics decreased by about 100 ℃ with the addition of nickel. With the increase of Ni content, the grain size of the ceramics first increased and then decreased. When the mole ratio of Ni to Ni was 3.0% (5 571), and the tan δ is small (0.011). Compared with the Ti / Ba = 1.00 doped barium titanate ceramic, the particle size of the barium titanate-doped barium titanate ceramics is small and the peak value of ε-T decreases.