TY - JOUR
T1 - Change in the short range order in the Al-transition metal hydroxides mixed system by mechanical stressing
AU - Sekino, S.
AU - Isobe, T.
AU - Senna, M.
AU - Shinohara, T.
AU - Wagatsuma, F.
AU - Sumiyama, K.
AU - Suzuki, K.
PY - 2000
Y1 - 2000
N2 - The redox reaction between Al and Ni(OH)2 or Cu(OH)2 by milling was studied mainly by XRD, 27Al-NMR, 63Cu-NMR and SQUID. With the progress of milling, the crystallinity of Al and hydroxides were degraded, while new crystallized phases appeared. Oxidation of metallic Al was confirmed by 27Al-NMR spectra. A linear relationship with negative inclination was obtained between the Knight shift (27K) of 27Al-NMR and magnetic susceptibility (χ) for these milled products. This suggests that the electric field gradient of metallic Al nuclei be influenced by transition metal cations, accommodating in the surface oxide layer on metallic Al particles. From these observations, we conclude that redox reactions occur at the contact point between Al and transition metal hydroxides. Theoretical background of the reaction was also discussed.
AB - The redox reaction between Al and Ni(OH)2 or Cu(OH)2 by milling was studied mainly by XRD, 27Al-NMR, 63Cu-NMR and SQUID. With the progress of milling, the crystallinity of Al and hydroxides were degraded, while new crystallized phases appeared. Oxidation of metallic Al was confirmed by 27Al-NMR spectra. A linear relationship with negative inclination was obtained between the Knight shift (27K) of 27Al-NMR and magnetic susceptibility (χ) for these milled products. This suggests that the electric field gradient of metallic Al nuclei be influenced by transition metal cations, accommodating in the surface oxide layer on metallic Al particles. From these observations, we conclude that redox reactions occur at the contact point between Al and transition metal hydroxides. Theoretical background of the reaction was also discussed.
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M3 - Conference article
AN - SCOPUS:0033700642
VL - 343
SP - I/-
JO - Materials Science Forum
JF - Materials Science Forum
SN - 0255-5476
T2 - ISMANAM-99: The International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials
Y2 - 30 August 1999 through 3 September 1999
ER -