摩砕されたNiOおよびZnO粉末粒子の表面物性について

概要

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The crystallite dimension and the lattice distortion of the ground NiO and ZnO powder were measured by X-ray diffraction method, and the effects of dry ballmilling on the catalytic decomposition of H_2O_2 and apparent density and angle of repose were studied and excess oxygen were measured by iodometry. The following results have been obtaind (1) In the early stage of grinding process, the catalytic activation energy of the NiO powder increases by removal of the oxygen rich surface layer, and decreases as it formes, but the rate of grinding process, other active center would be increased as lattice distortion increases, and it appears that activation energy increases as excess oxygen increases. The changing of activation energy of ZnO powder with the change of excess oxygen shows symmetric behavior as that of NiO powder. (2)The frequency factor of the catalytic reaction with NiO and ZnO powder changed as activation energy changes. It shows compensation effect. (3)Excess oxygen of the NiO and ZnO powder changed as lattice distortion increases. (4)It seems that the coagulate force of the NiO powder changes as the excess oxygen changes.
社団法人日本材料学会の論文
1972-06-15