铌酸钾钠基无铅压电陶瓷的X射线衍射与相变分析  

X-ray diffraction and phase transition analysis for (K,Na) NbO_3-based lead-free piezoelectric ceramics

作　　者：明保全[1] 王矜奉[1] 臧国忠[2] 王春明[1] 盖志刚[1] 杜鹃[1] 郑立梅[1] 

机构地区：[1]山东大学物理学院,济南250100 [2]聊城大学材料科学与工程学院,聊城252059

出　　处：《物理学报》2008年第9期5962-5967,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50572056);教育部博士点基金(批准号:20070422059)资助的课题~~

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.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）NbOB-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°.

关 键 词：铌酸钾钠 无铅压电陶瓷 X射线衍射 相变 

分 类 号：TM282[一般工业技术—材料科学与工程]