Decomposition of iron, cobalt, nickel, and copper formates

Khimchenko, Yu. I.; Vasilenko, V. P.; Radkevich, L. S.; Myalkovskii, V. V.; Chubar, T. V.; Chegoryan, V. M.

doi:10.1007/bf00791078

Cited by 7 publications

(3 citation statements)

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“…The production of nickel by the thermal decomposition of some organic and organometallic nickel compounds, as well as the reduction of nickel l hydroxyde with hydrogen, are among the most usual chemical procedures [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Nickel basic salts as inorganic precursors in the production of nickel

et al. 1987

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The utilization of sorne nickel basic salts, nickel hydroxychloride and nickel hydroxynitrate, as inorganic precursors in the obtention of nickel powder, has been studied. When these materials are thermally decomposed in an X-ray high-temperature diffraction chamber, pure nickel is formed as the only compound at about 700· C but if nickel hydroxide is the starting material, small amounts of nickel oxide are always present even if the temperature is raised up to 900· C.

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Section: Introductionmentioning

confidence: 99%

Nickel basic salts as inorganic precursors in the production of nickel

et al. 1987

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“…It is believed [2,4] that the less thermodynamically stable component in some powder systems containing components with different reducing ability accelerates the reduction of the other component and nucleates a new metal phase. This phenomenon is associated with the catalytic action of metal in the reduction of the less thermodynamically stable component.…”

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confidence: 99%

“…1 and 2) of mixtures and separately each component [2][3][4] shows that pure components decompose at a greater rate. For example, Ni(COOH) 2 · 2H 2 O decomposes at the maximum rate of 16 %/min.…”

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confidence: 99%

Double mixtures of ultrafine metal powders: Production, rolling, and sintering. I. Thermal decomposition of double metal formate mixtures

Lyushinskii¹

2008

Powder Metall Met Ceram

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The thermal decomposition of metal formates in the production of ultrafine metal powders permits controlling particle size and specific surface S sp , i.e., controlling free surface energy [1,2]. It is believed [3] that the smaller the particles and the more developed the surface, the more nonequilibrium their state and the higher their activity in subsequent pressing and sintering. In turn, this activity reveals itself when thermal and mechanical loads on these powders are low.This paper examines how the process of producing double formate mixtures and thermal decomposition modes affect the composition, particle size, and physical and chemical properties of ultrafine powders.Two methods were employed to produce double powder mixtures (nickel + copper, nickel + cobalt, copper + cobalt) containing components in different ratios, %: 10 + 90, 25 + 75, 50 + 50, 75 + 25, and 90 + 10. The first method involved obtaining pure metal formates, their careful mechanical mixing until they are uniform, and thermal decomposition. The second method involved obtaining formates in the form of solid solutions (or formate of a mixture) with a needed ratio of components, and their thermal decomposition [2].The production of pure metal formates and solid-solution formates is based on the precipitation of basic carbonates or hydroxides of these metals, their subsequent dissolution in the equimolecular amount of formic acid, and sedimentation of practically insoluble formates from the oversaturated solutions. Nickel and cobalt nitrates and copper sulfate are starting compounds for obtaining pure metal formates. Excess sodium carbonate is added to the solution of appropriate salts at 50-60ºC and vigorously mixed to precipitate basic metal carbonates according to the following reactions: 2Ni

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