【摘要】 分析了斜方相、四方相铌酸钾钠基无铅压电陶瓷材料的结构和X射线衍射图谱的特点.对于铌酸钾钠基压电材料斜方相结构,从构成晶胞的一个单斜原胞进行分析,计算出X射线衍射谱上每个衍射角附近的衍射峰数目和相对强度.提出了2θ在20°—60°范围内根据(1 0 2)衍射峰(52°附近)和(1 2 1)衍射峰(57°附近)劈裂的数目区分斜方和四方相的新方法.对于多晶陶瓷粉末,可以更简便的由22°(或45°)附近前后峰的相对高低来判断斜方、四方相.更多还原

【Abstract】 Characteristic of the orthorhombic and tetragonal phase of（K,Na）NbO₃-based lead-free piezoelectric ceramics was analyzed in theory.X-ray diffraction differences between the orthorhombic and tetragonal phase were clarified in the 2θ range from 20° to 60°.For the orthorhombic（K,Na）NbO₃-based piezoelectric ceramics,the number and relative intensity of X-ray diffraction peaks were calculated from a monoclinic primitive cell.A method distinguishing orthorhombic and tetragonal phase from the X-ray diffraction patterns was proposed.It is found that the phases of（K,Na）NbO₃-based piezoelectric ceramics can be distingwished exactly from peaks of the primitive cell planes（1 0 2） and（1 2 1）.For the powder diffraction,the phases can be distinguished more easily by relative intensities of the diffraction peaks for the peak-split position at around 22° or 45°.更多还原