Dielectric and piezoelectric properties and PTC behavior of Ba0.9Ca0.1Ti0.9Zr0.1O3−xLa ceramics prepared by hydrothermal method
Dielectric and piezoelectric properties and PTC behavior of Ba0.9Ca0.1Ti0.9Zr0.1O3−xLa ceramics prepared by hydrothermal method
复制标题
DOI：
10.1016/j.matlet.2013.12.043
复制
发表时间：
2014-03
影响因子：
3
通讯作者：
Zixiong Sun;Y. Pu;Zijing Dong;Yao Hu;Xiaoyan Liu;Peikui Wang;Meng Ge
中科院分区：
文献类型：
--
作者：
Zixiong Sun;Y. Pu;Zijing Dong;Yao Hu;Xiaoyan Liu;Peikui Wang;Meng Ge
采用水热法和快速微波烧结法制备了无铅Ba0.9Ca0.1Ti0.9Zr0.1O3-xLa（x=0.000，0.005，0.010，0.015和0.020）陶瓷，研究了La掺杂对Ba0.9Ca0.1Ti0.9Zr0.1O3电性能的影响。在x ≤0.10时，观察到单一的正交相;在x =0.015和0.020时，观察到正交相和四方相共存。少量La 3+的掺杂使材料的介电常数和介电损耗降低，在x =0.010时介电常数和介电损耗均出现最小值。当x ≥0.015时，Ba_（0.9）Ca_（0.1）Ti_（0.9）Zr_（0.1）O_（3-x）La_（3-x）陶瓷转变为半导体，并观察到PTC行为。在50 °C下测得的压电常数（d33）在La 3+部分取代后增加，这是因为正交相和四方相共存的增强。TC随La 3+的增加而降低，x =0.02时，样品的铁电和压电性能不能被检测到。
Lead-free Ba0.9Ca0.1Ti0.9Zr0.1O3–xLa (x=0.000, 0.005, 0.010, 0.015, and 0.020) ceramics have been prepared by hydrothermal method and were assisted by fast microwave sintering, and the effects of La-doping on the electrical properties of Ba0.9Ca0.1Ti0.9Zr0.1O3were studied. The single orthorhombic phase was observed in the composition ofx≤0.10 and the coexistence of orthorhombic and tetragonal phase were detected atx=0.015 and 0.020. The substitution of small amount of La3+resulted in an decreasing of dielectric constant and dielectric loss, and they both possessed a minimum value atx=0.010. With the addition ofx≥0.015, the Ba0.9Ca0.1Ti0.9Zr0.1O3–xLa ceramics became semi-conductors and the PTC behavior was observed. The piezoelectric constant (d33) measured at 50 °C of the ceramics were increased after the partial substitution of La3+because of the enhancement of coexistence of orthorhombic and tetragonal phases. TheTCwas decreased with increasing La3+, and the ferroelectric and piezoelectric properties cannot be detected at samples withx=0.02.