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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。
Four kinds of tourmaline with different iron contents in Xinjiang, Sichuan and Yunnan and those with Yunnan tourmaline heat-treated at 48h and 72h at room temperature and -100 ℃ were analyzed by single crystal X-ray diffraction. The distortion parameters of each polyhedron were calculated, The effect of iron content, temperature and heat treatment time on the distortion parameters of polyhedrons was analyzed. The results show that at room temperature and -100 ℃, with the increase of iron content, the bond length and bond angle of T polyhedrons in four kinds of Fe-Mg tourmaline decrease, while the tourmaline, With the extension of heat treatment time, the bond length and bond angle of [SiO4] polyhedrons increase. It can be seen that temperature, iron content and valence are the important factors affecting the bond length and bond angle distortion of [SiO4] polyhedra in tourmaline. Factors, but also affect the pyroelectricity of tourmaline an important factor.