Normal spectral emissivity of near‐stoichiometric single‐crystal nickel oxide in the red and in the green

Autor:	A. H. Madjid, J. M. Martinez
Rok vydání:	1973
Předmět:	Materials science business.industry Nickel oxide Non-blocking I/O Tantalum Analytical chemistry General Physics and Astronomy chemistry.chemical_element Optics chemistry Electrical resistivity and conductivity Emissivity Wafer Black-body radiation business Single crystal
Zdroj:	Journal of Applied Physics. 44:5419-5422
ISSN:	1089-7550 0021-8979
Popis:	The normal spectral emissivity of an indirectly heated wafer of single‐crystal NiO has been measured for λ = 0.645 μm and λ = 0.546 μm. The NiO was characterized by a room‐temperature resistivity of 7 × 1010 Ω cm, and the measurements were made using a thermal equivalent of an electrical potentiometer consisting of an incandescent NiO surface as the ``unknown'', a tantalum blackbody furnace as the ``standard'', and a thermoprobe as a ``comparison device'' with which the surface temperatures of the ``unknown'' and the ``standard'' may be compared. This arrangement is useful for the determination of emissivities of substances which are not readily fashioned into blackbodies. It is found that NiO is a very good emitter having an emissivity which ranges from about 0.94 to 0.90 as the temperature is varied from 1100 to 1500°K; and that the emissivity in the red is almost identical to the emissivity in the green. These results permit the speculation that NiO may well radiate as an almost black graybody over the...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d3e724132ab2ede5a4ab8f36e6eb04f9 https://doi.org/10.1063/1.1662167 Zobrazit plný text záznamu