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在30kbar和900℃条件下,用等化学计量氧化物混合物合成了11个斜方辉石系列的样品,并对合成的样品进行了X射线粉晶分析和红外光谱分析。分析结果表明,晶胞参数和红外光谱随化学成分的改变而产生复杂的变化。不仅晶胞参数b和M而且频率ν_(670cm)-1和M之间存在很好的线性相关关系,通过用最小二乘法所拟合的相关方程可容易地测定斜方辉石的成分,但是α和c与M之间只有较差的线性关系,而ν_(450cm)-1和M以及ν_(380cm)-1和M之间并无简单的线性相关关系,这可归因于Fe~(2+)在M_1和M_2位置的有序分布。
Eleven samples of orthopyroxene were synthesized from isostatically stoichiometric mixtures at 30kbar and 900 ℃. The synthesized samples were characterized by X-ray crystallography and infrared spectroscopy. The analysis results show that the unit cell parameters and the infrared spectrum change with the chemical composition to produce complex changes. Not only the unit cell parameters b and M but also the frequency ν 670cm -1 have a good linear correlation with M, and the composition of orthopyroxene can be easily determined by the correlation equation fitted by the least square method, but There is only a poor linear relationship between α and c and M, while there is no simple linear correlation between ν_ (450cm) -1 and M and ν_ (380cm) -1 and M due to Fe ~ ( 2+) in the order of M_1 and M_2.