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Normal spectral emissivities of liquid and solid Fe, Co, and Ni have been determined at their melting points at wavelengths from 650 to 800 nm and from 1000 to 1900 nm using an apparatus that consists of a cold crucible and diffraction grating spectroscopes. For all three metals, the emissivities of the liquid phases are slightly larger than those of the solid phases both in the visible and near-infrared...
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