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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 20, Number 2
BKCSDE 20(2)
February 20, 1999 

Coupled Substitution of NiO and TiO2 in Hematite
Bong-Hoon Park, Dong-Su Kim
The partitionings of NiO and of NiO and TiO2 between hematite and Na2O2B203 melts were studied by the flux growth method as a function of solute concentration. The substitution mechanisms of NiO and/or TiO2 in -Fe2O3 lattice were discussed based on the concentration dependence of the distribution coefficients. The substitution of Ni2+ ion for Fe3+ was accompanied by the charge compensating oxy-en ion vacancies, while the coupled substitution of Ni2+ and Ti4+ ions for Fe3+ was accompanied by the formation of Fe2+ ion, which was confirmed by chemical analysis.
195 - 198
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