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- W2521961679 abstract "Transition metal salts dissolved in dimethyl ether (Me{sub 2}O) or tetrahydrofuran (THF) are rapidly reduced to metal particles with diameters from < 3 to 15 nm by reaction with dissolved K{sup +}(15-crown-5){sub 2}K{sup {minus}}. The small size and high reactivity of the particles makes them good candidates for solid-state synthesis. For example the reactions in Me{sub 2}O, with M = Ta or Mo: MCl{sub 5} + 5/2K{sup +}(15C5){sub 2}K{sup {minus}} {yields} M(s) + 5/2K{sup +}(15C5){sub 2}Cl{sup {minus}} + 5/2K{sup +}Cl{sup {minus}} produce metal particles with crystallite sizes < 30 {angstrom}. In the case of Mo, the nitride, {gamma}-Mo{sub 2}N was prepared by heating the washed product of reduction of MoCl{sub 5} in flowing nitrogen for 5 hours at 800{degrees}C. The major problem in preparing such oxophyllic metal powders is the difficulty of removing the byproducts without metal oxidation. Successive washings with Me{sub 2}O and NH{sub 3} (with intermediate grinding of the powder) was used to prepare salt-free metal samples." @default.
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- W2521961679 date "1993-12-31" @default.
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- W2521961679 title "Nanoscale metal particles by reduction with alkalides or electrides as synthesis precursors" @default.
- W2521961679 hasPublicationYear "1993" @default.
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