Abstract
Mixtures of yttrium oxide and platinum powders undergo a chemical interaction that inhibits the sintering of the mixture, thereby stabilizing its open pore network at temperatures up to 1500 °C. A mechanism for this phenomenon has been proposed, based on the results of SEM, EPMA, and AES analysis. Sintering of the platinum particles beyond the intermediate stage (continuous pore channel) is inhibited by the formation of an yttrium-rich phase on the surface of the particles. The formation of this phase involves the wetting and spreading of yttrium oxide, initially present as 0.4 μm particles in the platinum. Spreading of yttrium oxide over the platinum inhibits sintering by lowering the surface energy of the platinum.
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Powell, B.R. Platinum sintering inhibition by yttrium oxide. Catal Lett 15, 189–197 (1992). https://doi.org/10.1007/BF00770911
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DOI: https://doi.org/10.1007/BF00770911