Infrared reflectance spectra of fayalite, and absorption datafrom assorted olivines, including pressure and isotope effects
Infrared reflectance spectra of fayalite, and absorption datafrom assorted olivines, including pressure and isotope effects
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铁橄榄石的红外反射光谱和各种橄榄石的吸收数据，包括压力和同位素效应
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发表时间：
1997
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通讯作者：
A. Hofmeister
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作者：
A. Hofmeister
合成铁橄榄石（Fe_2SiO_4）的偏振单晶红外（IR）反射光谱具有对称性所要求的所有峰，但只有一个峰，加上一些弱带可归因于泛音。 铁橄榄石在86 cm−1处有一个谱带，低于通常检测的频率范围，这表明含铁矿物的振动光谱可能需要重新测量。 还测量了天然钙镁橄榄石（接近MgCaSiO4）和合成Mg2Si18O4的B2u极化。收集了上述物种Co2SiO4、Mn2SiO4、Mg2SiO4、（Mg1.9Fe0.1）SiO4、Mg2GeO4和Mn2GeO4的薄膜吸收数据。IR峰位置（来自这些数据和来自先前的单晶研究）与平均阳离子质量的平方根倒数的关系用于进行谱带分配，估计缺失谱带的位置，并确定哪些峰是简并的。的压力依赖性的manticellite IR峰进行了测量和类似的其他橄榄石。
Abstract Polarized single-crystal infrared (IR) reflectance spectra measured for synthetic fayalite (Fe2SiO4) possess all but one of the peaks mandated by symmetry plus a few weak bands attributable to overtones. Fayalite has a band at 86 cm−1, which is below the frequency range commonly examined, suggesting that vibrational spectra of ferrous minerals may need remeasuring. B2u polarizations were also measured for natural monticellite (nearly MgCaSiO4) and synthetic Mg2Si18O4. Thin film absorption data were collected for the above species, Co2SiO4, Mn2SiO4, Mg2SiO4, (Mg1.9Fe0.1)SiO4, Mg2GeO4 and Mn2GeO4. The relationships of IR peak positions (from these data and from previous single-crystal studies) with the inverse square root of the average cation mass were used to make band assignments, to estimate the positions for missing bands, and to determine which peaks are degenerate. The pressure dependencies of monticellite IR peaks were measured and resemble those of other olivines.