Abstract
In order to reduce sintering temperature and prevent adverse dielectric effects, pure BaTiO3 powder with the addition of Mn-Si-O glass was sintered in the temperature range of 1175–1300°C. Microstructural observation showed that BaTiO3 grains of the sintered samples only grew from the initial 400 nm to an average of 430 nm between 1175–1275°C for 1 h, or sintered at 1250°C as long as 27 h. Abnormal BaTiO3 grains are not found in the sintered samples. The microstructure and phase analysis showed that the dielectric properties, tetragonality, and grain growth of BaTiO3 are closely controlled by the formation of the liquid phase, newly formed Ba2TiSi2O8 grains, and Mn solid solution in BaTiO3 grains.
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References
S. Sumita, M. Ikeda, Y. Nakano, K. Nishiyama, T. Nomura, Degradation of multilayer ceramic capacitors with nickel electrodes. J. Am. Ceram. Soc. 74(ll), 2739–46 (1991)
C.A. Randall, S.F. Wang, D. Laubscher, J.P. Dougherty, W. Huebner, Structure property relationship in core-shell BaTiO3-LiF ceramics. J. Mater. Res. 8(4), 871–9 (1993)
L. Zhou, Z. Jiang, S. Zhang, Electrical properties of Sr0.7Ba0.3TiO3 ceramics doped with Nb2O5, 3Li2O-2SiO2, and Bi2O3. J. Am. Ceram. Soc. 74(11), 2925–7 (1991)
R.Z. Chen, A. Cui, X.H. Wang, Z.L. Gui, L.T. Li, Structure, sintering behavior and dielectric properties of silica-coated BaTiO3. Mater. Lett. 54, 314–7 (2002)
M. Valant, D. Suvorov, R.C. Pullar, K. Sarma, N.M. Alford, A mechanism for low-temperature sintering. J. Europ. Ceram. Soc. 26, 2777–83 (2006)
C. Metzmacher, K. Albertsen, Microstructural investigations of Barium Titanate-Based Material for base metal electrode ceramic multilayer capacitor. J. Am. Ceram. Soc. 84(4), 821–6 (2001)
Q. Feng, C.J. McConville, D.D. Edwards, Effect of oxygen partial pressure on the dielectric properties and microstructures of cofired base-metal- electrode multilayer ceramic capacitors. J. Am. Ceram. Soc. 89(3), 894–901 (2006)
D.F. Hennings, Dielectric materials for sintering in reducing atmospheres. J. Euro. Ceram. Soc. 21, 1637–42 (2001)
M.R. Opitz, K. Albetsen, J.J. Beeson, D.F. Hennings, J.L. Routbort, C.A. Randall, Kinetic process of reoxidation of base metal technology BaTiO3-based multilayer capacitors. J. Am. Ceram. Soc. 86(11), 1879–84 (2003)
Y.S. Jung, E.S. Na, U. Paik, J. Lee, J. Kim, A study on the phase transition and characteristics of rare earth elements doped BaTiO3. Mater Res Bull 37, 1633–40 (2002)
S. Wang, S. Zhang, X. Zhou, B. Li, Z. Chen, Investigation on dielectric properties of BaTiO3 co-doped with Ni and Nb. Mater. Lett. 60, 909–11 (2006)
S. Wang, S. Zhang, X. Zhou, B. Li, Z. Chen, Influence of sintering atmosphere on the microstructure and electrical properties of BaTiO3-based X8R materials. J. Mater. Sci. 41, 1813–7 (2006)
C.S. Chen, C.C. Chou, I.N. Lin, Microstructure of X7R type base-metal-electroded BaTiO3 capacitor materials prepared by duplex-structured process. J. Europ. Ceram. Soc. 25, 2743–7 (2005)
Y. Mizuno, T. Hagiwara, H. Kishi, Microstructural design of dielectrics for Ni-MLCC with ultra-thin active layers. J. Ceram. Soc. Japan 115(6), 360–4 (2007)
J.C.C. Lin, W.C.J. Wei, Melting and interface reaction of Mn-Si-O glass on BaTiO3. J. Am. Ceram. Soc. 92(9), 1926–33 (2009)
N. Louet, H. Reveron, G. Fantozzi, Sintering behaviour and microstructural evolution of ultrapure-alumina containing low amounts of SiO2. J. Europ. Ceram. Soc. 28, 205–15 (2008)
M.F. Yan, R.M. Cannon, H.K. Bower, in Ceramic Microstructures ’76, ed. by R.M. Fulrath, J.A. Pask (Westview, Boulder, 1977), pp. 276–307
C.J. Lin, W.C.J. Wei, Grain boundary pinning of polycrystalline Al2O3 by Mo inclusions. Mater. Chem. & Phys. 111, 82–6 (2008)
S.B. Lee, W. Sigle, M. Ruhle, Investigation of grain boundaries in abnormal grain growth structure of TiO2- excess BaTiO3 by TEM and EELs analysis. Acta Mater. 50, 2151–62 (2002)
G. Arlt, D. Hennings, G. de With, Dielectric properties of fine-grained barium titanate ceramics. J. Appl. Phys. 58, 1619–25 (1985)
A. Halliyal, A.S. Bhalla, S.A. Markgraf, L.E. Cross, R.E. Newnham, Unusual pyroelectric and piezoelectric properties of fresnoite (Ba2TiSi2O8) single crystal and polar glass-ceramics. Ferroelectrics 62(1), 27–38 (1985)
X. Wang, M. Gu, B. Yang, S. Zhu, W. Cao, Hall effect and dielectric properties of Mn-doped barium titanate. Microelectron. Eng. 66, 855–9 (2003)
M.A. Zubair, C. Leach, The influence of cooling rate and SiO2 additions on the grain boundary structure of Mn-doped PTC thermistor. J. Europ. Ceram. Soc. 28, 1845–55 (2008)
Acknowledgement
The authors like to thanks the funding partially from the National Science Council in Taiwan and from the Ministry of Economic Affairs, Taiwan, R.O.C. under contract numbers NSC94-2216-E-002-020 and 97-EC-1-A-08-S1-107, respectively.