Showing papers on "Chromium(III) oxide published in 1989"
TL;DR: Etude par microscopie electronique a transmission des transitions de phases lors de lhydrolyse des suspensions de particules d'oxyde de chrome (III) as mentioned in this paper.
Abstract: Etude par microscopie electronique a transmission des transitions de phases lors de l'hydrolyse des suspensions de particules d'oxyde de chrome (III)
12 citations
01 Jan 1989
TL;DR: In this article, the defect and transport properties of Cr2O3 are analyzed based on studies of the electrical conductivity and Seebeck coefficient of TiO2-and MgO-doped Cr 2O3.
Abstract: Based upon studies of the electrical conductivity and Seebeck coefficient of TiO2- and MgO-doped Cr2O3, the point defect structure of Cr2O3 was determined. It is found that the defect and transport properties in Cr2O3 are complicated. At high temperatures, different defects may be present depending upon the oxygen partial pressure. In general, at high PO2, Cr2O3 is a p-type semiconductor with electron holes and chromium vacancies as the dominant defects; at intermediate PO2, it behaves as an intrinsic semiconductor with electrons and electron holes dominant; and at low PO2, near the Cr/Cr2O3 equilibrium oxygen pressure, it changes to an n-type semiconductor with electrons and chromium interstitials dominant. The equilibrium constants associated with the formation of different defects are also obtained.
7 citations
TL;DR: In this article, the authors describe the method of laser induced pyrolysis of gaseous compounds for the continuous production of very fine powders, which can be varied in the range from 50 nm to 350 nm by changing different process parameters such as pressure and nature of the carrier gas.
5 citations
TL;DR: The reduction exceeding a certain amount of surface oxygen species on α-Cr2O3 by CO causes a change in surface structure, with the conversion of more active to less active sites, which is visualized by measuring the distribution of the oxidation power of the surface oxygen as discussed by the authors.
Abstract: The reduction exceeding a certain amount of surface oxygen species on α-Cr2O3 by CO causes a change in surface structure, with the conversion of more active to less active sites, which is visualized by measuring the distribution of the oxidation power of the surface oxygen species.
4 citations