Pb(Zn_(1/3)Nb_(2/3))O_3-PbTiO_3陶瓷的合成及性能

Synthesis of Perovskite Phase of Pb(Zn_(1/3) Nb_(2/3) )O_3 PbTiO_3 Cera mic and its Piezoelectric Properties

采用不同固相合成法对钙钛矿型Ｐｂ（Ｚｎ１／３Ｎｂ２／３）０．８Ｔｉ０．２陶瓷材料的合成过程进行了研究。ＸＤＲ结果表明，相同合成条件下，不同合成方法得到的陶瓷粉末钙钛矿含量不同，其中，传统固相合成法（ＰｂＯ＋ ＺｎＯ＋ Ｎｂ２Ｏ５＋ ＴｉＯ２）钙钛矿得率最低，简单先驱体合成法（ＰｂＯ＋ ＺＮ＋ ＴｉＯ２）钙钛矿得率较高，复合先驱体合成法（ＰｂＯ＋ ＺＮＴ）钙钛矿得率最高。先驱体合成法具有抑制Ｂ位复合钙钛矿固相合成过程中焦绿石相形成的作用。采用复合先驱体合成法以少量钛酸钡作为晶型稳定剂采用适当的合成工艺可以得到钙钛矿纯度大于９８％ Ｐｂ［（Ｚｎ１／３Ｎｂ２／３）０．８Ｔｉ０．２］Ｏ３ 陶瓷粉末。其具有较宽的烧成温度范围，该陶瓷材料的居里温度为１９０ °Ｃ，具有较高的压电常数，且压电常数随烧结温度的提高而降低。用ＤＴＡ 对各合成方法的配合料进行了研究，发现，差热特征峰峰位与合成过程中焦绿石的出现和钙钛矿的合成温度有很好的对应关系。

The synthesis of perovs kite phase for Pb(Zn 1/3 Nb 2/3 ) 0.8 Ti 0.2 ceramic with different synthes is m ethods was studied by XRD.It was found t hat the contents of perovskite in cerami c powders synthesized at similar conditi on was different for different methods.B y the traditional method,(PbO+ZnO+Nb 2O 5+TiO 2) ,ceramic powder with lower cont ent of perovskite can be obtained.By the simple precursor method,(PbO+ZN+TiO 2), ceramic powder with higher content than for traditional methods can be obtained. By compostie precursor method,it can obt ain the power with highest content of pe rovskite.The formation of pyrochlore pha se can be controlled well in processes o f precursor methods.The ceramic powder w ith perovskite content higher than 98 pe rcents can be obtain by composite synthe sis methods with little BaTiO 3 as cryst al stabilizer.Such kind of ceramic powde r possesses broad range of sintering tem perature.The curie temperature of Pb[(Zn 1/3 Nb 2/3 ) 0.8 Ti 0.2 ]O 3 cerami c is 190 °C.The ceramic has higher piezo electric property,and the d 33 of th e ceramic decrease with increasing of si ntering temperature.