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Strong solute-solvent interactions in the systems Mg-Pd and Al-Pd: manifestation of charge transfer and s-p-d hybridization

Jacob, KT and Hoque, SM and Waseda, Y (1998) Strong solute-solvent interactions in the systems Mg-Pd and Al-Pd: manifestation of charge transfer and s-p-d hybridization. In: Zeitschrift fur Metallkunde, 89 (7). pp. 487-493.

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Abstract

The activities of Mg and Al in solid Pd have been measured in the temperature range 1425 to 1725 K using metal-oxide equilibration technique under controlled oxygen partial pressures. Thin foils of Pd were sandwiched between pellets of either MgO or $Al_2O_3$. Oxygen partial pressures were established using $H_2+CO_2$ gas mixtures and measured using a solid state cell based on yttria-doped thoria as the electrolyte. The concentration of Mg or Al in solid Pd was determined using inductively coupled plasma - atomic emission spectrometer (ICP-AES) and electron probe microanalysis (EPMA). The activity of Mg or Al was computed from the standard Gibbs energy of formation of MgO or $Al_2O_3$ and the oxygen potential established by the gas phase. The very small values for the activity coefficients $(2.3·10^{-7}<γ_{Mg}o<7.4·10^{-5}$ and $2.2·10^{-10}<γ_{Al}o<3.6·10^{-8})$ indicate unusually strong interaction between the solute and the solvent, caused primarily by charge transfer from the solute to the solvent, with a smaller contribution from hybridization and covalent bonding involving s, p and d electrons.

Item Type: Journal Article
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 08 Jan 2007
Last Modified: 27 Aug 2008 12:30
URI: http://eprints.iisc.ernet.in/id/eprint/9228

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