ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The influence of heating rates and environment conditions on the thermal behaviour of two cobalt basic salts,β-Co2(OH)3Cl and Co5(OH)8.5Cl1.5 · 2.5H2O, have been studied. The processes were followed using thermogravimetric and differential thermal analysis, X-ray diffraction, and infrared spectroscopy. When decomposition reactions are carried out in a nitrogen atmosphere, Co3O4 is always formed in quantities that seem to depend on the heating rates. When decomposition processes are carried out in an X-ray high-temperature diffraction chamber, pure cobalt is obtained at 750° C as the final product. Green cobalt hydroxychloride, the composition of which determined from chemical analysis seems to correspond to the formula Co5(OH)8.5Cl1.5 · 2.5H2O or alternatively 4Co(OH)2. CoCl1.5(OH)0.5 · 2.5H2O, has been isolated as a stable compound and the evolution of this material during the ageing process has been followed by X-ray diffraction, electron microscopy and BET surface-area determination.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01154598
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