熔盐法合成Na0.5K0.5NbO3粉体

功能材料, 2005, 36(12): 1974-1976.

熔盐法合成Na0.5K0.5NbO3粉体

范亚红 ^1, , 孙清池 ^2, , 王裕斌 ^3, , 潘铁政 ^4, , 陆翠敏 ^5,

1.天津大学,材料科学与工程学院,天津,300072

2.天津大学,材料科学与工程学院,天津,300072

3.天津大学,材料科学与工程学院,天津,300072

4.天津大学,材料科学与工程学院,天津,300072

5.天津大学,材料科学与工程学院,天津,300072

基金项目: 中国科学院资助项目(10232030)

关键词：无铅压电陶瓷 , 熔盐法 , XRD , 介电压电性

The preparation of (Na0.5K0.5) NbO3 powder by molten salt synthesis

Keywords： lead free piezoelectric ceramics , molten salt synthesis , X-ray diffraction , dielectric and piezoelectric properties

采用熔盐法在K2CO3和Na2CO3的熔盐(K2CO3/Na2CO3=45/55)中800℃并保温2h的条件下制备出了单相、纯钙态矿型结构的Na0.5K0.5NbO3粉体,运用XRD以及SEM技术对所得粉体进行了相组成及显微结构分析.结果表明:随着盐含量的增加,晶体结构从正交相转变为四方相,晶粒大小先增加而后稍微减小,并且获得较好的介电压电性:εT33/ε0(1kHz)=45～264,tgδ=1.5%～2.6%,Tc=402℃,TT-o=202℃,d33=88～98pC/N,Qm=465～574,Kp=29.09%～30.47%,在10kHz频率下,介电损耗有一点改变.NKN将有可能成为用于高频下的无铅压电陶瓷之一.

The (Na0.5K0.5)NbO3 powder with single-phase, pure perovskite was prepared at 800℃ for 2h in molten salt (K2CO3/Na2CO3 =45/55),which was characterized by the X-ray diffraction and SEM technique. It was found that the crystal structure changes from orthorhombic phase to tetragonal phase and grain size increases and then reduces a little with the increasing of salt.Good dielectric and piezoelectric properties can be observed: εT33/ε0 (1kHz) = 45 ～ 264, tgδ= 1.5 % ～ 2.6%, Tc = 402 ℃, TT-o =202℃ ,d33 =88～98pC/N, Qm =465～574, Kp =29.09%～30.47% and in the frequency of 10kHz, the dielectric loss changed a little.

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