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Synchrotron infrared reflectivity measurements of iron at high pressures

机译：铁在高压下的同步辐射红外反射率测量

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The infrared reflectance of iron was studied using high-pressure synchrotron radiation methods up to 50 GPa at room temperature in a diamond anvil cell of 1000-8000 cm~(-1) (1.25-10 (mu)m). The magnitude of the reflectivity shows a weak pressure dependence up to the transition from the body centered cubic (alpha) to hexagonal close packed (epsilon) phase transition, where a discontinuous change in both the slope and magnitude of the reflectivity was observed. Reflectance spectra were corrected for diamond absorption and treated with a Kramers-Kronig analysis to extract the optical constants; the emissivity of iron was derived from Kirchoff's law. The pressure and wavelength dependence of the emissivity is characterized by an empirical function for 1.5-1.9 (mu)m; this wavelength range is useful for spectroradiometric temperature measurements from 1000 K up to approx2500 K. alpha-Fe is a nonideal emitter; however, epsilon-Fe behaves as an almost perfect greybody in the infrared up to the highest pressures of the measurements. Temperature measurements based on the spectroradiometry of iron samples should take into account the wavelength dependent emissivity below the alpha-epsilon phase transition at approx13 GPa.
机译：在室温下，在1000-8000 cm〜（-1）（1.25-10μm）的金刚石砧室中，使用高达50 GPa的高压同步辐射法研究了铁的红外反射率。反射率的大小显示出微弱的压力依赖性，直到从体心立方（α）到六方密堆积（epsilon）相变为止，在该处都观察到反射率的斜率和大小不连续变化。校正反射光谱的金刚石吸收率，并用Kramers-Kronig分析法处理以提取光学常数。铁的发射率源自基尔霍夫定律。发射率的压力和波长依赖性通过1.5-1.9μm的经验函数来表征。该波长范围可用于从1000 K到大约2500 K的光谱辐射温度测量。α-Fe是非理想的发射器;然而，在最高测量压力下，ε-Fe在红外线中的表现几乎是完美的灰体。基于铁样品的光谱辐射法进行的温度测量应考虑到在大约13 GPa时低于α-ε相变的与波长有关的发射率。

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