Tolerance Factor of ABO<SUB>3</SUB>-type Ilmenite Compound

The tolerance factor of ABO_3-type ilmenite by analyzing the ABO_3 ilmenite crystal struc- ture is established,and combining with the electronegativity difference,regularities governing the forma- tion and the stability of ilmenite-type compounds are discussed.The tolerance factor equation is proved appropriate for ilmenite structure by analyzing the structure stability of some ilmenite compounds,such as MgTiO_3,NiTiO_3,CoTiO_3,ZnTiO_3 and(Zn_(1-x),M_x)TiO_3(M denote Mg,Ni,Co).According to the results of statistical analyzing the tolerance factor and electronegativity difference of the present ABO_3-type ilmenite,the experience tolerance factor value and experience electronegativity difference value to form stable ilmenite compound are obtained,that is,t0.80 and e1.465.