Importance

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Abstract

An iron oxide whisker of high aspect ratio or titanium oxide whisker of high aspect ratio that is useful as a magnetic material for magnetic recording, a part of micromachine, etc.; and a structure having such a whisker erected on a basal plate that is useful as a catalyst, etc. There is provided an iron oxide whisker of 5 nm to 2 .mu.m diameter and .gtoreq.20 aspect ratio wherein the content of non-iron metal atoms is .ltoreq.10 at %, and provided a titanium oxide whisker of 5 nm to 20 .mu.m diameter and .gtoreq.5 aspect ratio wherein the content of non-titanium metal atoms is .ltoreq.10 at %. Further, there is provided a structure, such as a basal plate having these whiskers densely erected thereon. These whiskers excel in magnetic properties, etc., and the structures having these erected exert excellent characteristics, such as large contact area as a catalyst and freedom from clogging, and hence are useful. In the production of these oxide whiskers, an iron or titanium material is brought into contact with an oxidative atmosphere so as to react the surface iron or titanium atoms with oxygen brought into contact therewith at high temperature, thereby attaining growth as oxide whiskers.

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First Claim