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

Department of Applied Chemistry

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

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.

Original language	English
Pages (from-to)	I/-
Journal	Materials Science Forum
Volume	343
Publication status	Published - 2000
Event	ISMANAM-99: The International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials - Dresden, Ger Duration: 1999 Aug 30 → 1999 Sept 3

ASJC Scopus subject areas

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

Cite this

@article{b164b03ba90f447f954ba7b3da5fa94d,

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",

language = "English",

volume = "343",

pages = "I/--",

journal = "Materials Science Forum",

issn = "0255-5476",

publisher = "Trans Tech Publications",

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

}

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

SN - 0255-5476

VL - 343

SP - I/-

JO - Materials Science Forum

JF - Materials Science Forum

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

Abstract

ASJC Scopus subject areas

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