FIBROUS MAGNESIUM OXIDE AND PROCESS FOR PRODUCTION THEREOF

摘要

A magnesium oxide having a cubic system needle-like crystal structure and a length-to-diameter ratio, determined by an electron microscope at a magnification of 10,000, of at least about 5; and a process for producing a magnesium oxide having a cubic system needle-like crystal structure, which comprises calcining a basic magnesium compound having a needle-like crystal structure expressed by the following formula Mg(OH)2-nxAxn-.mH2O wherein An- represents a monovalent (n=1) to tetravalent (n=4) anion, x is 0.2