Papers by Keyword: BaTiO3 Ceramic

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Authors: V.V. Mitié, Lj.M. Kocié, I. Mitrović
Authors: L. Mitoseriu, Massimo Viviani, M.T. Buscaglia, V. Buscaglia, A. Testino, Paolo Nanni
Authors: Xiang Ping Jiang, M. Zeng, K.W. Kowk, Helen Lai Wah Chan
Abstract: Barium titanate with A-site substituted by various amount of bismuth oxide (Ba1-x BixTiO3, abbreviated as BBT, x=0.05, 0.1, 0.15) were prepared by solid-state reaction. The effect of bismuth substitution on crystallographic phase, dielectric and ferroelectric properties was studied. The X-ray diffraction shows that the samples were crystallized into pure perovskite structure when x=0.05 and 0.1, while for x=0.15 sample, second phase appeared in the dominant perovskite phase. The temperature dependence of dielectric permittivity of the ceramics was investigated and the evolution from normal ferroelectrics to relaxor ferroelectric sates was observed. In the range 0≤x≤0.1, the temperature of dielectric peak Tm is independence of the frequency, indicating the normal ferroelectrics behavior. At x=0.15, dielectric relaxation process with a broadening distribution of the permittivity dielectric is observed.
Authors: Zong Zhang, Jia Liang Zhang, Shou Fu Shao, Peng Zheng, Chun Lei Wang
Abstract: Various ceramics were prepared by the conventional solid-state reaction technique according to the compositional formula of (1-x) BaTiO3 + x CuO with x = 0.00 ~ 0.05. The influence of CuO additive on microstructure, crystalline structure and dielectric and piezoelectric properties were investigated. It has been found that CuO acts like a sintering aid in the CuO-modified BaTiO3 ceramics to promote the ceramic densification and suppress the abnormal grain growth during sintering process, and decreases the orthorhombic-tetragonal phase transition temperature. The CuO-modified BaTiO3 ceramics show desirable microstructures with high density, small average grain size and uniform grain size distribution. For the one with x = 0.01, it has the good piezoelectric properties of d33 = 300 pC/N, kp = 0.49, k33 = 0.62 and Qm = 425 at room temperature, and exhibits a ε' peak at -5°C and a d33 maximum of 353 pC/N at 0°C, respectively.
Authors: L.M. Li, Guo Li Ji, Y.P. Yang, Zhao Xian Xiong
Abstract: Practical evolutions of pores in BaTiO3 ceramics during sintering are studied, including the preparation of practical BaTiO3 ceramics and observation of ceramic microstructure by SEM. The reduction of porosity and thus dense process results from the change of the free energy in the ceramic system, which is altered by the disappearing of the interface between solid and pore. The sintering process are monitored, including sintering neck growth, pore shape and size changing, grain growth and compact body contracting. Theoretical formulae during the sintering process are applied for the computer simulation. The experimental results of BaTiO3 ceramics are in good agreement with that of simulation.
Authors: L. Normand, R. Kilaas, Y. Montardi, A. Thorel
Authors: Qing Zhang, Rui Yuan Niu, Min Wang, Bin Cui, Zhu Guo Chang
Abstract: Li-Ti-O (abbreviated as LTO) nano-composites were synthesized via sol-gel process, and then doped BaTiO3 based X7R type ceramics. The LTO nano-composites and their ceramics were characterized by means of thermaogravimetric, Fourier-transform infrared, X-ray diffraction methods, transmission electron microscopy. We also characterized the dielectric properties of the LTO doped BaTiO3 based ceramics of X7R type. The results indicated that LTO nano-composites were nanometer scale powders. The pH value and calcining temperature had an influence on particle size of LTO sintering aids. At pH about 3 and with calcining at 600 °C, the nano-composites attained minimum particle size (about 10 nm). By adding 0.10 wt% of the LTO nano-composites, the temperature permittivity achieved about 4200 when sintered at 1240 °C for 4 h, and the dielectric properties met X7R standard.
Authors: Ai Guo Kang, Xiao Hui Wang
Abstract: For nanocrystalline BaTiO3 ceramics, the ferroelectric P-E hysteresis loop was measured with different impressing rate of field. The results are interesting for different grain size samples. Based on the combination of the theory of Avrami mode and the reorientation of polarization vector, the experimental results are analyzed. It is shown that the reorientation of polarization vector is the chief mechanism of hysteresis for large grain and the formation of new domain is important for samples of small grain size.
Authors: V.V. Mitié, M. Radmanovié, Lj.M. Kocié, Z. Dukié
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