Topic
Chromium(III) oxide
About: Chromium(III) oxide is a research topic. Over the lifetime, 163 publications have been published within this topic receiving 2526 citations. The topic is also known as: green oxide of chromium & green chromium oxide.
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TL;DR: In this article, the transformations in nanosized chromium layers at different layer thicknesses and thermal treatment temperatures were studied by optical spectroscopy, microscopy, and gravimetry.
Abstract: The transformations in nanosized chromium layers at different layer thicknesses (d = 14–154 nm) and thermal treatment temperatures (T = 673–873 K) were studied by optical spectroscopy, microscopy, and gravimetry. The kinetic curves of conversion at different chromium film thicknesses and treatment temperatures are well approximated by the linear, inverse logarithmic, cubic, and logarithmic functions. The contact potential difference for Cr and Cr2O3 films and photo-emf for Cr-Cr2O3 systems were measured. An energy band diagram of Cr-Cr2O3 systems was constructed. A model of thermal transformation was constructed for Cr films that included the stages of oxygen adsorption, charge carrier redistribution in the contact field of Cr-Cr2O3, and chromium(III) oxide formation.
5 citations
Patent•
11 Dec 1978TL;DR: In this article, a process for the production of low sulphur chromium(III) oxide comprising annealing at a calcining temperature from about 800° C. to 1100° C was described.
Abstract: A process for the production of low sulphur chromium(III) oxide comprising annealing at a calcining temperature from about 800° C. to 1100° C. a mixture of alkali metal chromate and about 0.7 to 0.96 times its molar amount of ammonium sulfate, and separating the chromium(III) oxide formed from the alkali metal salt. Advantageously the ammonium sulfate in the form of a concentrated solution is mixed with solid alkali metal dichromate and the mixture thereafter is adjusted prior to calcination to a water concentration of less than about 15% by weight of water.
5 citations
TL;DR: In this paper, the lysozyme (LSZ) presence effect on the chromium(III) oxide (Cr 2 O 3 ) suspension stability is described. And the results show that at the LSZ concentrations above 50 ppm the macromolecules cover completely the particle surface, which is evidenced by the observed zeta potential values.
5 citations
01 May 1974
TL;DR: In this paper, it was shown that the rate of oxidative vaporization of Cr2O3 was markedly enhanced in the presence of O atoms, and the enhancement was about 10 to the 9th power at 820 K in oxygen containing 2.5 percent atoms.
Abstract: Rates of oxidative vaporization of Cr2O3 were found to be markedly enhanced in the presence of O atoms. Investigations were conducted over the temperature range 470 to 1520 K. For Cr2O3 the enhancement was about 10 to the 9th power at 820 K in oxygen containing 2.5 percent atoms. Rapid oxidative vaporization of bare chromium was observed below 1070 K, the rate being about one-half that of Cr2O3. Results are interpreted in terms of thermochemical analysis.
4 citations
17 Jan 2013-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this paper, the solubility of Cr(III) species originating from dissolution of Cr2O3 in cryolite-based melts was studied in the temperature range 1173 K to 1293 K (900 °C to 1020 °C).
Abstract: The solubility of Cr(III) species originating from dissolution of Cr2O3 in cryolite-based melts was studied in the temperature range 1173 K to 1293 K (900 °C to 1020 °C). The molar ratio n(NaF)/n(AlF3) was in the range of 1.4 to 2.6. It was found that the solubility depends markedly on the molar ratio n(NaF)/n(AlF3), high ratios resulting in higher solubility. A semi-empirical model describing the solubility of Cr2O3 was developed. The standard deviation between calculated and experimental data is 10 pm (ca 2.4 pct).
4 citations