SynopsisTypical calciumferrile clyslals were succesifllily synlhesized by Ihe so/idliquid reaction method which seems sUjJerior to Ihe convenlional solid-slate reaction method ill obtaining large and pC/feci clystals. Synlheses were carried out starling with each of the mixtures of CaO · FC 2 0 3 , 2Ca O · FC 2 0 3 , Ca O · 2Fe20 3, 4Ca O· FeO . 4Fe 2 0 3 , 3Ca O · 1'eO· 7Fe,0 3' and 4·Ca O· FeO · 8Fe 2 0 3 • Optical projJerties, r~(leclivily , etching eJlecl, m.icrohardness, and X-ray diJJractioll pattern, were examined all Ihe .rylllilesized calcium fe rrites. T wo comjJollllds were jJroved to coexist Ilear CaO· 2 Fe 2 0 " ill chemical composition; aile is CaO · 2Fe 2 0 " alld Ihe olher is a ternary calcium/errite which is cOllsidered to be aile of thefollowillgs: 3CaO·FcO · 7Fc 2 0 3 , 4CaO ·Fe O· 9Fc,0 3' alld 4CaO. 2FcO · 91'<' 2 0 3 · * O rig inall y published in T elsll-to-Hagane, 55 ( 1969), 669 in J a pa nese. En gl ish ve rsion received Dece m be r 2 1, 1968.
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