具有不同居里点的两种铁电体粉末在共烧时会产生过渡相．这种过渡相的特性与原始物相的性质密切相关·ＢａＴｉＯ３（简称ＢＴ）和Ｐｂ（Ｍｇ１／３Ｎｂ２／３）Ｏ３（简称ＰＭＮ）共烧时，介温特性发生异常变化．结果显示，在低温端介温曲线明显抬起，表明具有更低居里温度（Ｔｃ）的新相形成．而在高温端ＢＴ的Ｔｃ值升高，表明Ｐｂ进驻ＢＴ的晶格．共烧体的性能可以达到室温介电常数＞３０００，损耗＜６０，容温变化率符合Ｘ７Ｒ标准．
The transitional phase appeared when two ferroelectric powders with different Curie point were
mixed and sintered together. The characteristics of the transitional phase were related to the original phases. After
BaTiO3 (BT) and Pb(Mg1/3Nb2/3)O3 (PMN) were co-fired, the dramatic dielectric-temperature characteristics can be observed.
The results show a new phase with a lower Curie temperature (Tc) formed. The Tc of BT raises under the high ambient temperature,
which indicates the entrance of the Pb cation into the lattice of BT. The co-fired sample can be prepared with such excellent characteristics,
the dielectric constant is more than 3000 at room temperature, the dissipation factor is lower than 60 and the temperature coefficient of
capacitance (TCC) accords to the X7R standard.
参考文献
| [1] | Syamaprasad U, Sheeja Nair A R, Sarma M S, et al. J. Mater. Sci., 1997, 8: 199--205. [2] Koyuncu M, Pilgrim S M. J. Am. Ceram. Soc., 1999， 82 (11): 3075--3079. [3] Yohachi Yamshita. American Ceramic Society Bulletin, 8, 1994, 73 (8): 74--80. [4] 阮立坚, 李龙土, 桂治轮. 功能材料, 1997, 28 (2): 140--142. |
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