利用熔融法制备了BaO-SrO-TiO2-SiO2玻璃,并在温度梯度条件下制备了极性微晶Ba2-xSrxTiSi2O8沿c轴一维取向的压电玻璃陶瓷.用X-ray衍射分析和扫描电镜对极性微晶的取向生长结构进行了分析.建立了极性微晶沿c轴取向生长的模型,其结果与实验结果相一致.结果表明在光滑的表面,温度梯度方向和偶极子电场方向都是沿c轴晶格能大的方向,其共同作用的结果使极性微晶沿c轴一维取向生长.
Polar piezoelectric glass-ceramics of composition Ba2-xSrxTiSi2O8 with c-axis oriented growth
were prepared by crystallizing the BaO-SrO-TiO2-SiO2 glasses in a high temperature gradient. The structure was determined by XRD and SEM. The
physical model of driving force of the polar piezoelectric Ba2-xSrxTiSi2O8 crystal along c-axis dimension was set up,
in accord with the experiment. The results show that the c-axis oriented growth of polar crystal is synchronously driven by gradient of temperature, dipole field and c-axis maximum energy of crystal lattice. The interior
driving forces are both the difference of energy of ionic crystal lattice in different axis and dipole field produced by spontaneous polarization of polar
crystal. The exterior driving force is the gradient of temperature.
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