Study of Strontium Ferrate and Its Substituted Analogues

Strontium ferrate (SrFe03) has the classic perovskite structure just like lanthanum cobaltate (LaCo03). In SrFe03, iron is tetravalent and strontium is bivalent. In LaCo03, both lanthanum and cobalt are trivalent. Although these pristine compounds themselves are very interesting, some combinations of the two acquire even more exciting properties. 

Starting from SrFe03, substituting Ba or Ca for Sr, and Co for Fe, the resultant material absorbs CO2 heavily at high temperatures and this is why these compounds have become subjects of several studies. It was found that absorption properties can be optimized by applying the appropriate ratio of these elements at the respective lattice sites. It was found that while SrFe03 does not absorb CO2 readily, partial substitution of Fe by Co, and partial substitution of Sr by Ca results in significant increase in the CO2 absorption rate and capacity [15], 

1 Study of Sro.95C3o.o5Coo.5F6o.503 s snd Sr0.5C30.5Co0.5FG0.5O3 

The iron content of these materials gives an opportunity for the direct use of Mossbauer spectroscopy (TMS technique) as a tool to learn more about the CO2 absorption mechanism in these systems. It was reported on the basis of TMS 

19 TRANSMISSION AND EMISSION MOSSBAUERSTUDIES ON PEROVSKITES AND RELATED OXIDE SYSTEMS 

---