Investigations on structure and proton diffusion coefficient of rare earth ion (Y3+/Nd3+) and aluminum codoped α-Ni(OH)2
来源期刊：JOURNAL OF RARE EARTHS2008年第4期
论文作者：LIU Aifang LI Yanwei SONG Sha LIU Changjiu
Key words：α-nickel hydroxide; chemical coprecipitation; proton diffusion coefficient; rare earths;
Abstract: Rare earth ion (Nd3+/Y3+) and Al3+ codoped α-Ni(OH)2 powers were synthesized by chemical coprecipitation method. The structure was analyzed with X-ray diffraction (XRD) and thermal gravity (TG). Cyclic voltammetry (CV) tests were performed to evaluate the proton diffusion coefficients of the samples. The results indicated that codoping of Y-Al and Nd-Al resulted in more water molecules contained within the crystal lattice and accordingly increased the interlayer spacing. In particular, the Y-Al codoped α-Ni(OH)2 showed a turbostratic structure. The calculated diffusion coefficients of the Y-Al codoped α-Ni(OH)2 and Nd-Al codoped α-Ni(OH)2 were 3.5×10-10 cm2/s and 2.8×10-10 cm2/s, respectively.
LIU Aifang1，LI Yanwei1，SONG Sha1，LIU Changjiu1
(1.Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China)
Abstract:Rare earth ion (Nd3+/Y3+) and Al3+ codoped α-Ni(OH)2 powers were synthesized by chemical coprecipitation method. The structure was analyzed with X-ray diffraction (XRD) and thermal gravity (TG). Cyclic voltammetry (CV) tests were performed to evaluate the proton diffusion coefficients of the samples. The results indicated that codoping of Y-Al and Nd-Al resulted in more water molecules contained within the crystal lattice and accordingly increased the interlayer spacing. In particular, the Y-Al codoped α-Ni(OH)2 showed a turbostratic structure. The calculated diffusion coefficients of the Y-Al codoped α-Ni(OH)2 and Nd-Al codoped α-Ni(OH)2 were 3.5×10-10 cm2/s and 2.8×10-10 cm2/s, respectively.
Key words:α-nickel hydroxide; chemical coprecipitation; proton diffusion coefficient; rare earths;
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