温度、铁含量和价态对电气石多面体扭曲的影响  

Influence of Temperature, The Content and Valence of Fe in Tourmaline on Their Polyhedron Distortion

作　　者：赵长春[1] 廖立兵[2] 原江燕[2] 程瑶[2] 

机构地区：[1]中国地质大学数理学院,北京100083 [2]中国地质大学材料科学与工程学院,北京100083

出　　处：《硅酸盐学报》2013年第1期103-109,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(40672031)资助项目

摘　　要：利用单晶X射线衍射对新疆、四川和云南的4种不同铁含量的电气石与经过48h和72h热处理的云南电气石在室温和-100℃的结构进行分析,计算了各多面体的扭曲参数,分析了铁含量、温度和热处理时间对多面体扭曲参数的影响。结果表明:在室温和-100℃,随着铁含量的增加,4种铁-镁电气石中T多面体的键长和键角扭曲均减小,而经过48 h和72 h热处理的电气石,随着热处理时间的延长,[SiO4]多面体的键长和键角扭曲均增大,可见,温度、铁含量及其价态是影响电气石中[SiO4]多面体的键长和键角扭曲的重要因素,也是影响电气石热释电性的重要因素。The structures of four tourmalines with different Fe contents from Xinjiang, Sichuan and Yunnan provinces, China and one tourmaline from Yunnan province heat-treated for 48h and 72h were characterized at room temperature and -100 ℃ by single crystal X-ray diffraction. The influences of temperature, content and valence of Fe on the polyhedron distortion parameters were analyzed. The results show that the bond-length and bond-angle distortion of the [SiO4] polyhedra in four tourmaline decreases with increasing the Fe content at room temperature and -100 ℃, and the bond-length and bond-angle distortion of the [SiO4] polyhedra increases with increasing the heat treatment time, indicating that the temperature, iron content and valence are important factors affecting on the bond length and bond angle distortions of the [SiO4] polyhedra in tourmaline and the pyroelectric properties of tourmaline.

关 键 词：电气石 多面体扭曲参数 热释电性 热处理 

分 类 号：P578[天文地球—矿物学] P584[天文地球—地质学]