Rh2O3 has been found in two major forms. The hexagonal form adopts thecorundum structure. It transforms into anorthorhombic structure when heated above 750 °C.[1]
Rhodium oxide films behave as a fast two-colorelectrochromic system: Reversible yellow ↔ dark green or yellow ↔ brown-purple color changes are obtained inKOH solutions by applying voltage ~1V.[7]
Rhodium oxide films are transparent and conductive, likeindium tin oxide (ITO) - the common transparent electrode, but Rh2O3 has 0.2 eV lowerwork function than ITO. Consequently, deposition of rhodium oxide on ITO improves the carrier injection from ITO thereby improving the electrical properties oforganic light-emitting diodes.[5]
^abCoey, J. M. D. (1970-11-01). "The crystal structure of Rh2O3".Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry.26 (11). International Union of Crystallography (IUCr):1876–1877.doi:10.1107/s0567740870005022.ISSN0567-7408.
^H. L. Grube (1963). "The Platinum Metals". In G. Brauer (ed.).Handbook of Preparative Inorganic Chemistry, 2nd Ed. NY: Academic Press. p. 1588.
^Wold, Aaron; Arnott, Ronald J.; Croft, William J. (1963). "The Reaction of Rare Earth Oxides with a High Temperature Form of Rhodium(III) Oxide".Inorganic Chemistry.2 (5). American Chemical Society (ACS):972–974.doi:10.1021/ic50009a023.ISSN0020-1669.
^Mulukutla, Ravichandra S.; Asakura, Kiyotaka; Kogure, Toshihiro; Namba, Seitaro; Iwasawa, Yasuhiro (1999). "Synthesis and characterization of rhodium oxide nanoparticles in mesoporous MCM-41".Physical Chemistry Chemical Physics.1 (8). Royal Society of Chemistry (RSC):2027–2032.Bibcode:1999PCCP....1.2027M.doi:10.1039/a900588i.ISSN1463-9076.
^Gottesfeld, S. (1980). "The Anodic Rhodium Oxide Film: A Two-Color Electrochromic System".Journal of the Electrochemical Society.127 (2). The Electrochemical Society: 272.doi:10.1149/1.2129654.ISSN0013-4651.
^Pino, P.; Botteghi, C. (1977). "Aldehydes from olefins: cyclohexanecarboxaldehyde".Organic Syntheses.57: 11.doi:10.15227/orgsyn.057.0011.
^Mulukutla, Ravichandra S; Shido, Takafumi; Asakura, Kiyotaka; Kogure, Toshihiro; Iwasawa, Yasuhiro (2002). "Characterization of rhodium oxide nanoparticles in MCM-41 and their catalytic performances for NO–CO reactions in excess O2".Applied Catalysis A: General.228 (1–2). Elsevier BV:305–314.doi:10.1016/s0926-860x(01)00992-9.ISSN0926-860X.
