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XXIII. The Transition Temperatures of Cobalt and of Nickel, Some Observations on the Oxides of Nickel

XXIII. The Transition Temperatures of Cobalt and of Nickel, Some Observations on the Oxides of... By Sterling B. Hendricks, . E. Jefferson, and J. P . Shultz. (With 1 figure). The first evidence for polymorphism of cobalt was the observation of A. W. Hull 1 ) that samples of the metal prepared under various conditions gave different types of x-ray powder diffraction patterns. He found that cast cobalt has a hexagonal close-packed structure. Annealing at 600° for six hours was sufficient to effect a partial transformation of the hexagonal structure to a cubic close-packed one. This later modification is apparently the more stable one at 600°; it alone was produced by reduction of the oxide at that temperature. The sluggish nature of the structure change prohibits the ready application of thermal methods to the determination of the transformation point. H. M a s u m o t o 2 ) and later W. C. Ellis 3 ), using such methods found the transition temperature to be between 400° and 450°. The point of transition of hexagonal to cubic cobalt can be established by reducing the oxides at fixed temperatures, rapidly cooling the resulting metal and determining its crystal structure. In applying such a method we reduced C03O4, obtained by ignition of ($)2 containing http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Zeitschrift für Kristallographie - Crystalline Materials de Gruyter

XXIII. The Transition Temperatures of Cobalt and of Nickel, Some Observations on the Oxides of Nickel

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Publisher
de Gruyter
Copyright
Copyright © 1930 by the
ISSN
2194-4946
eISSN
2196-7105
DOI
10.1524/zkri.1930.73.1.376
Publisher site
See Article on Publisher Site

Abstract

By Sterling B. Hendricks, . E. Jefferson, and J. P . Shultz. (With 1 figure). The first evidence for polymorphism of cobalt was the observation of A. W. Hull 1 ) that samples of the metal prepared under various conditions gave different types of x-ray powder diffraction patterns. He found that cast cobalt has a hexagonal close-packed structure. Annealing at 600° for six hours was sufficient to effect a partial transformation of the hexagonal structure to a cubic close-packed one. This later modification is apparently the more stable one at 600°; it alone was produced by reduction of the oxide at that temperature. The sluggish nature of the structure change prohibits the ready application of thermal methods to the determination of the transformation point. H. M a s u m o t o 2 ) and later W. C. Ellis 3 ), using such methods found the transition temperature to be between 400° and 450°. The point of transition of hexagonal to cubic cobalt can be established by reducing the oxides at fixed temperatures, rapidly cooling the resulting metal and determining its crystal structure. In applying such a method we reduced C03O4, obtained by ignition of ($)2 containing

Journal

Zeitschrift für Kristallographie - Crystalline Materials – de Gruyter

Published: Nov 1, 1930

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