Change in the short range order in the Al-transition metal hydroxides mixed system by mechanical stressing

S. Sekino; T. Isobe; M. Senna; T. Shinohara; F. Wagatsuma; K. Sumiyama; K. Suzuki

Change in the short range order in the Al-transition metal hydroxides mixed system by mechanical stressing

S. Sekino, T. Isobe, M. Senna, T. Shinohara, F. Wagatsuma, K. Sumiyama, K. Suzuki

応用化学科

研究成果: Conference article

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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.

元の言語	English
ページ（範囲）	I/-
ジャーナル	Materials Science Forum
巻	343
出版物ステータス	Published - 2000 1 1
イベント	ISMANAM-99: The International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials - Dresden, Ger 継続期間: 1999 8 30 → 1999 9 3

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ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Sekino, S., Isobe, T., Senna, M., Shinohara, T., Wagatsuma, F., Sumiyama, K., & Suzuki, K. (2000). Change in the short range order in the Al-transition metal hydroxides mixed system by mechanical stressing. Materials Science Forum, 343, I/-.

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title = "Change in the short range order in the Al-transition metal hydroxides mixed system by mechanical stressing",

abstract = "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.",

author = "S. Sekino and T. Isobe and M. Senna and T. Shinohara and F. Wagatsuma and K. Sumiyama and K. Suzuki",

year = "2000",

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note = "ISMANAM-99: The International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials ; Conference date: 30-08-1999 Through 03-09-1999",

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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 - 2000/1/1

Y1 - 2000/1/1

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

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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 -

Change in the short range order in the Al-transition metal hydroxides mixed system by mechanical stressing

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