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Normal spectral emissivities of alloys are indispensable to temperature measurements using one-colour pyrometers in various metallurgical processes, because the accuracy in measured temperatures is determined principally by that in emissivity data. In the previous work, one of the present authors reported normal spectral emissivities for solid Cu–Ni alloys at high temperature determined for a wavelength of 632.8 nm by ellipsometry, along with a brief review of emissivity data for solid alloys, which review showed that emissivity data were available only for limited alloys. This situation has been unchanged still now and further accumulation of data is required. Thus, the aim of the present work is to determine normal spectral emissivities at 632.8 nm for solid Ni–Co alloys at high temperature by ellipsometry. There is only one report available for emissivity data of the alloy although several studies have been made on nickel and cobalt. Furthermore, emissivity measurements on Ni–Co alloys are of scientific interest because these alloys form complete solid solution in certain temperature ranges, in which the alloys experience magnetic transformation.

Ellipsometric Determination of Normal Spectral Emissivities at 632.8 nm for Solid Ni–Co Alloys at High Temperature