INFLUENCE OF THE NATURE OF MILLING MEDIA ON PHASE-TRANSFORMATIONS INDUCED BY GRI

2020-03-24 20:41:02

structure tools cubic Of oxide

责任者: BEGINCOLIN, S;LECAER, G;ZANDONA, M;BOUZY, E;MALAMAN, B 单位: UNIV METZ,ISGMP,MET MAT POLYCRISTALLINS LAB,F-57045 METZ 01,FRANCE.;UNIV NANCY 1,CHIM SOLIDE MINERAL LAB,CNRS,URA 158,F-54506 VANDOEUVRE NANCY,FRANCE. 来源出处: JOURNAL OF ALLOYS AND COMPOUNDS, v 227 1995, p 157- 166 摘要: Polymorphic transformations induced by dry ball milling in an argon atmosphere have been investigated in various oxides (TiO2, SnO2, Y2O3, WO3) by X-ray diffraction, Mossbauer spectroscopy and transmission electron microscopy (TEM). The transformations have been found to depend on the nature of the milling media, particularly when reduction reactions take place between grinding tools and oxide particles. When ground with steel tools, cubic yttria is transformed into a monoclinic modification as reported in the literature, while tin oxide is reduced. When ground with zirconia tools, cubic yttria with a bixbyite type structure is transformed into cubic yttria with a fluorite type structure, while monoclinic tungsten oxide is transformed into a cubic oxide with an ReO3 type structure. Plausible structural explanations are proposed. In all cases, nanometre-sized domains have been observed by TEM even after grinding times as short as some minutes. 关键词: GRINDING; OXIDES; POLYMORPHIC TRANSFORMATIONS; MILLING MEDIA; NIOBIUM PENTOXIDE; X-RAY; AMORPHIZATION; WO3; DIFFRACTION; ACTIVATION; SOLIDS; FILMS SOLIDS; FILMS