Abstract
ARTIFICIALLY produced crystals of magnesium oxide (MgO) are now available commercially ; since they are formed as a by-product in a commercial process, they are not expensive. Our samples were obtained from the Norton Company, Woreester, Mass., U.S.A. Most of the pieces of crystal are about 1 cm. × 1 cm. × 0.5 cm., but a few larger specimens up to 3 cm. × 3 cm. × 1 cm. are produced. Some specimens are quite clear, some are slightly yellow, and some are a. little cloudy. The clear specimens are transparent to 2200. The crystal belongs to the cubic system, but most specimens show some double refraction owing to residual strains.
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References
Bull. Amer. Phys. Soc., 9, No. 6 6, Dec. 1934.
W. P. Davey and E. O. Hoffman, Phys. Rev., 15, 333; 1920. W. Gerlach and O. Pauli, Z. Phys., 7, 116; 1921.
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DITCHBURN, R., HARDING, J. Properties of Crystalline Magnesium Oxide. Nature 136, 70–71 (1935). https://doi.org/10.1038/136070b0
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DOI: https://doi.org/10.1038/136070b0
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