Abstract
Particles in different states of oxidation were prepared by spray pyrolyses of aqueous solutions of silver and copper nitrates under different gas environments: air, nitrogen or mixture gas of 10 vol%H2-N2, respectively. Silver nitrate was converted to phase-pure silver at temperatures below 500 °C whose densification and crystallization were completed around 500 °C, irrespective of the gas environment. On the other hand, phase-pure copper(II) oxide was formed from copper nitrate up to 1,000 °C with air, but below 800 °C with nitrogen, above which copper(I) oxide was produced. Phase-pure copper particles were obtained with the mixture gas at temperatures above 400 °C. Copper(I) oxide was sintered and crystallized more easily than copper(II) oxide. The rates of the metallization, sintering and crystallization of copper were between those of silver and nickel.
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Park, E.K., Rah, S. & Kim, SG. Effect of gas environment on properties of particles prepared by spray pyrolysis of metal nitrates. Korean J. Chem. Eng. 25, 885–891 (2008). https://doi.org/10.1007/s11814-008-0146-7
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DOI: https://doi.org/10.1007/s11814-008-0146-7