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利用电子顺磁共振(EPR)和X射线衍射方法研究了天然和热处理钠长石单晶。热处理在500—850℃水热条件下完成。在外加磁场B平行于晶体c~*轴的方向上,测量了加热前后Fe~(3+)的EPR谱和线宽△B随温度和加热时间的变化。结果显示,线宽随Al、Si无序的增大而增加。由此得出结论,在低温钠长石中,Fe~(3+)位于Al~(3+)占据的T_1(o)位置,在被研究的温度范围内,Fe~(3+)未参与四面体位置T间Al、Si交换。谱线的加宽主要是由在Fe~(3+)邻近位置上Al、Si无序的增大引起的,同时与观测到的晶胞参数变化有关。在Al、Si无序更强的晶体中,Fe~(3+)谱变得极宽。
Natural and heat treated albite single crystals were studied by means of electron paramagnetic resonance (EPR) and X-ray diffraction. Heat treatment at 500-850 ℃ hydrothermal conditions to complete. The changes of EPR spectrum and linewidth △ B of Fe ~ (3+) with temperature and heating time before and after heating were measured in the direction of the applied magnetic field B parallel to the c ~ * axis of the crystal. The results show that the line width increases with the disorder of Al and Si. It is concluded from this that in the low temperature albite, Fe 3+ is located at T 1 (o) occupied by Al 3+, and Fe 3+ is not involved in the studied temperature range Tetrahedron position T, Al, Si exchange. The broadening of the spectrum is mainly caused by the increase of disorder of Al and Si in the vicinity of Fe ~ (3 +), which is also related to the observed change of unit cell parameters. In Al, Si disordered stronger crystals, Fe ~ (3 +) spectrum becomes extremely wide.