超低膨胀陶瓷K_（2x）Ba_（1－x）Zr_4（PO_4）_6系统的X射线衍射  

X-ray Diffraction Studies on Ultralow-thermal Expansion Ceramics K_(2x)Ba_(1-x)Zr_4(PO_4)_6 System

作　　者：郭常霖[1] 郭荣发[1] 黄月鸿[1] 郭会明[1] 

机构地区：[1]中国科学院上海硅酸盐研究所

出　　处：《无机材料学报》1996年第3期525-530,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金

摘　　要：用高温Ｘ射线衍射方法对磷酸锆钡钾系统陶瓷材料的各向异性热膨胀作了研究．对七个组份试样的７７套高温Ｘ射线衍射图作了仔细的指标化和精密点阵常数测定．点阵常数随温度作非线性变化·对Ｋ_２ｘＢａ_１－ｘＺｒ_４（ＰＯ_４）_６的不同组份不同温度（３００～１３００Ｋ）的热膨胀系数。α_ａ、α_ｃ、　作了测定·该系统零膨胀陶瓷的组份为Ｋ_１．１６Ｂａ_０．４２Ｚｒ_４（ＰＯ_４）_６（ｘ＝０．５８）The anisotropic thermal expansion characteristics of K_2xBa_1-xZr_4(PO_4)_6 system were investigated by using the high-temperature X-ray diffraction method. 77 sets of diffraction patterns were indexed carefully and the accurate values of the lattice parameter of seven compounds in K_2xBa_1-xZr_4(PO_4)_6 system were determined at different temperatures ranging from 300 to 1300K. The lattice parameters were found to vary non-linearly with temperature. The thermal expansion coefficients α_a,α_c, of all seven compositions at different temperatures were determined. The composition of zeroexpansion ceramics was K_1.16Ba_0.42Zr_4(PO_4)_6 (x=0.58).

关 键 词：磷酸锆钡钾陶瓷 X射线衍射 陶瓷 热膨胀 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ174.1[化学工程—硅酸盐工业]