(14-x)SrCO_3-xCaCO_3-24CuO系统低于1000℃固态反应过程中物相的演变  

Phase evolution of (14-x)SrCO_3-xCaCO_3-24CuO system under ambient pressure below 1000 ℃

作　　者：曾艺[1] 潘复苏[1] 余祖兴[1] 石兢[1] 

机构地区：[1]武汉大学物理科学与技术学院,湖北武汉430072

出　　处：《材料科学与工艺》2007年第3期417-420,424,共5页Materials Science and Technology

基　　金：国家自然科学基金资助项目(10474074)

摘　　要：详细报告了采用粉末x射线衍射(XRD)和差热分析(DTA)技术研究(14-x)SrCO3-xCaCO3-24CuO系统在环境压力下低于1000℃温度范围内固态反应过程中物相的演变的结果.根据实验,当钙的掺入量x=8.4,11.2,13.6和14时,该系统的固态反应过程比较复杂,1000℃下得到的样品都是多相物;在945℃附近新观测到了一个尚未鉴定的相,它与其DTA曲线上第三个吸热峰相吻合.对于x=0,0.4,2.8和5.6的样品,其固态反应的规律非常相似:The phase evolution below 1000℃ during the solid -state reactions of （14 -x）SrCO3 -xCaCO3 - 24CUO system under ambient pressure is reported by means of X -ray diffraction （XRD） and differential thermal analysis （DTA） techniques in order to improve understanding of the phase equilibria of SrO - CaO - CuO system and to optimize the synthesis procedure of spin - ladder compound Sr14-xCaxCu24041. XRD experiments indicated that for （ 14 - x）SrCO3 - xCaCO3 - 24CUO system with x = 8.4, 11.2, 13.6 and 14, no single - phase was obtained below 1000℃ and an unidentified phase was newly observed around 945℃, which matches well with the formation of the third endothermic peak in the corresponding DTA curve. XRD experiments showed that for the system with x = 0, 0. 4, 2. 8 and 5.6 the reactions followed very similar mechanisms.

关 键 词：固态反应 粉末X射线衍射 差热分析 相图 自旋梯状结构化合物 

分 类 号：TM262[一般工业技术—材料科学与工程]