辽宁后仙峪镁电气石热处理改性及其磁性研究

摘要

The tourmaline from Houxianyu,Liaoning Province was heated under different temperatures in oxidi-zing condition.The structure and phase changing after heating treatment were analyzed by optical microscope, XRF,XRD and IR spectroscopy.Magnetic susceptibility was also determined by the magnetic susceptibility tes-ting instrument.The results showed that the black tourmaline was dravite.Under the temperature of 700 ℃ the structure of tourmaline began to change and transformed to anorthite and hematite under the temperature of 800 ℃,sintering phenomenon was observed at the same time.The magnetic susceptibility of tourmaline had a negative correlation with the heating temperature.The low-frequency magnetic susceptibility got to lowest as 33.6×10-6 cm3/g at 900 ℃.Its magnetic decrease was related to the phase and the ionic valency change.%对辽宁省后仙峪矿区的黑色电气石进行研究.对该地电气石进行热处理，并采用光学显微镜、X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)、红外光谱分析仪(IR)研究了电气石随热处理温度的改变导致的结构与物相变化规律，并利用磁化率测试仪测定了电气石磁性，探讨了在不同温度下热处理对电气石磁学性能的影响.结果表明，该地区黑色电气石为镁电气石，红外光谱数据以及磁化率变化表明电气石在700℃时，晶体结构开始发生变化.在加热温度到达800℃时，镁电气石已开始转化为钙长石、赤铁矿，并呈现出烧结现象，电气石的磁化率随热处理的温度增加而降低，在900℃时低频磁化率降至33．6×10-6 cm3/g.分析认为电气石的物相变化和离子价态改变是热处理后电气石磁性减弱的根本原因.