Dissociation of Iridium Oxide¹

Controlled activation of iridium film for AIROF microelectrodes

“…It is supposed to be the reduction of Ir(VI) to Ir(IV) in Eq. (4) and the transformation of unstable IrO 3 to IrO(OH) 2 [41][42][43][44][45][46][47]. M a n u s c r i p t 21 / 21…”

Thermochemistry and oxidation potentials of the platinum group metals and their compounds

“…Martin (124) has also reported the following. H2RuOs(aq) = OH-(aq) + HRu04+(aq) K(20°) = 5.7 X [10][11][12][13][14][15] As a result of investigations by Silverman and Levy (187) and Connick and Hurley (45,46), we are able to give a consistent set of free energies for hydrous Ru02, Ru04-2(aq), and Ru04-(aq). Polarographic (187) and equilibrium measurements (123) in alkaline solutions have led to the following potentials.…”

“…Qi.o = 1 X [10][11][12] HOs06-(aq) = H+(aq) + 0s05"2(aq) Qi.0 ^3 X [10][11][12][13][14][15][16] Free energies of HOsOs-(aq) and 0s05-2 (aq) are calculated from these values and the tabulated AG°for H20s06(aq). The principal Os(VIII) species in 1 M OHsolution is the singly charged anion, and we calculate the following potential for Os|Os(VIII) in such solutions.…”

“…The more recent results of Cordfunke and Meyer (47) lead to AH°= -65.5 ± 1.5 kcal mole-1 for Ir02(c). These workers claim that a nonstoichiometric oxide becomes important at high temperatures, but Bell, Tagami, and Inyard (20) have contradicted this claim. The results of Bell, Tagami, and Inyard (20) and Schafer and Heitland (164) appear to be the most reliable and are in reasonable agreement.…”

Initial Assessment of Environmental Barrier Coatings for the Prometheus Project

“…4~1 0~ K" and 6.2~10" K-I for Re and lr, respectively). [29] These duplex coatings are grown sequentially by CVD on a molybdenum mandrel which is subsequently removed chemically, leaving a free-standing part. [30] Typically, the Ir coating is 50-100 pm thick with a base rhenium thickness of 2500 pm.…”