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Received July 19, 2014
Accepted September 22, 2014
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LiCl 용융염에서 전해환원법을 통한 La0.5Nd0.5Ni5 합금 제조
Preparation of La0.5Nd0.5Ni5 Alloy by an Electrochemical Reduction in Molten LiCl
충북대학교 화학공학과, 362-763 충북 청주시 서원구 충대로 1
Department of Chemical Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk 362-763, Korea
smjeong@chungbuk.ac.kr
Korean Chemical Engineering Research, April 2015, 53(2), 145-149(5), 10.9713/kcer.2015.53.2.145 Epub 30 March 2015
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Abstract
LiCl 용융염에서 희토류 금속을 포함한 Nd2O3-La2O3-NiO 복합산화물의 전해환원을 통한 La0.5Nd0.5Ni5 합금제조에 대한 연구를 수행하였다. Nd2O3-La2O3-NiO 복합산화물은 1100 oC에서 소결시에 NiNd2O4 (스피넬)과 LaNiO3 (페로브스카이트) 구조가 생성되었다. 스피넬 및 페로브스카이트 구조는 복합산화물의 전해환원 반응속도를 증가시켰다. LiCl 용융염에서 전해환원 반응 동안 Nd2O3-La2O3-NiO 복합산화물은 Ni, NiLa2O4 등의 다양한 중간생성물을 거쳐 La0.5Nd0.5Ni5 합금으로 환원됨을 확인할 수 있었다. XRD 분석결과를 통해 최종 생성물인 La0.5Nd0.5Ni5의 생성 메카니즘을 제시하였다.
The electrochemical behavior of Nd2O3-La2O3-NiO mixed oxide including rare earth resources has been studied to synthesize La0.5Nd0.5Ni5 alloy in a LiCl molten salt. The Nd2O3-La2O3-NiO mixed oxide was converted to NiNd2O4 (spinel) and LaNiO3 (perovskite) structures at a sintering temperature of 1100 oC. The spinel and perovskite structures led a speed-up in the electrolytic reduction of the mixed oxide. Various reaction intermediates such as Ni, NiLa2O4 were observed during the electrochemical reduction by XRD analysis. A possible reaction route to La0.5Nd0.5Ni5 in the LiCl molten salt was proposed based on the analysis result.
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