Comparison of MA processes and products from Ni(OH)2 with Al or Al(OH)3

S. Sekino, M. Senna, T. Isobe, T. Shinohara, F. Wagatsuma

研究成果: Conference article査読

1 被引用数 (Scopus)


Ni(OH)2 was milled either with Al metal or with Al(OH)3 particles to compare the process of compounding and the properties of the products. Although the Knight shift, 27K, of 27Al-NMR spectrum of Al(OH)3 is about 0ppm, it exceeds 10000ppm after milling with Ni(OH)2 for 12h. This shift increases to above 20000ppm at lower temperature. In metallic Al system, 27K under the same condition was ca. 1600ppm and slightly decreases with decreasing temperature. In the latter system, the average conduction electron density of metallic Al is reduced by Ni species in the surface oxide layer, and reduces the Fermi contact interaction at Al nuclei to change the Knight shift. In contrast, in Al(OH)3 system, Al(III) species are surrounded by Ni(II) so that 27K is directly influenced by the local magnetic field of Ni(II). From the viewpoint of materials synthesis, using Al(OH)3 is more beneficial due to much more homogeneous structure close to that of NiAl2O4. We further elucidated the change in the state of Al by heating the as-milled product to give well-crystallized NiAl2O4. 27Al-NMR, 27K-X Plot, Homogeneity, Mechanochemical Reaction, NiAl2O4.

ジャーナルMaterials Science Forum
出版ステータスPublished - 2001 1月 1
イベントMetastable, Mechanically Alloyed and Nanocrystalline Materials (ISMANAM 2000) - Oxford, United Kingdom
継続期間: 2000 7月 92000 7月 14

ASJC Scopus subject areas

  • 材料科学一般
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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