A series of experiments have been designed to explore the upper limits in properties that can be produced from the high pressure, high temperature process for the synthesis of ferro-magnetic chromium dioxide. These show that CrO2coercivity and surface area, i.e. particle size, can be controlled independently over a wide range by the selection of the Cr3+to Cr6+ratio and type and level of dopant. Examples of high coercivity, reduced aspect ratio and high surface area are discussed. The performance of the high surface area (37 m2/g) in consumer video media is presented. Along with these results, a methodology that separates the particle contribution to media performance from the tape process parameters, such as surface smoothness, is presented.
No takes yet. Share an insight, caveat, or question.
Chen et al. (1984) studied this question.