Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Preparation of nanosized NiO powders by mixing acid and base nickel salts and their reduction behavior

Ni 산성염과 Ni 염기성 염의 혼합에 의한 나노 NiO 분말 제조 및 이의 환원 특성

  • Received : 2010.10.19
  • Accepted : 2010.12.10
  • Published : 2010.12.31
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Abstract

Nanosized NiO powder was prepared by mixing an acid nickel salt and a base nickel salt and their reduction behavior was studied. Ni formate was employed as an acid salt and nickel hydroxide and basic nickel carbonate as base salts. One equivalent acid salt was mixed with 9 equivalent base salt. The mixture of the formate and the carbonate produced ~100 run spherical NiO powder by heat treatment at $750^{\circ}C$/2 h, but the mixture of the formate and the hydroxide gave rise to ~100 nm pseudo spherical NiO powder by heat treatment at $600^{\circ}C$/2 h and grew fast to give pseudo cubic crystals of 100~600 run by heat treatment at $750^{\circ}C$/2 h. Reduction by hydrogen gas proceeded much faster for the one with the hydroxide than that with the carbonate to give porous body with well grown necks. Their behavior was studied by analysis of TG/DSC, XRD, and SEM.

나노 크기의 NiO 분말을 Ni 산성염과 Ni 염기성염을 혼합하여 제조하는 방법에서 원료가 생성되는 NiO와 이의 환원으로 생성되는 Ni 결정 특성에 미치는 영향을 연구하였다. 산성염으로는 Ni formate를 염기성염으로는 수산화 Ni과 염기성 Ni 탄산염을 사용하였다. 혼합비는 산성염 1당량에 염기성염 9당량을 사용하였으며, 탄산염을 사용한 경우 $750^{\circ}C$/2 h 하소에서도 ~100 nm의 구형의 NiO 분말을 얻었으며, 수산화 염을 사용한 경우는 $600^{\circ}C$/2 h에서는 ~100 nm의 유사 구형의 NiO가 생성되나, $750^{\circ}C$ 열처리에서는 100~600 nm의 유사 입방체 분말을 얻었다. 수산화 염을 사용한 경우에는 탄산염을 사용한 경우에 비하여 수소가스에 의한 환원이 훨씬 빠르게 진행되어 necking이 일어나며 소결이 이루어져 다공체를 형성하였다. 이들 특성을 TG/DSC, XRD, SEM으로 분석하였다.

Keywords

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