Study of CuFe2O4-SnO2 nanocomposites by Moessbauer spectroscopy with high velocity resolution

High velocity resolution Moessbauer spectroscopy was used to study of (CuFe2O4)1-x(SnO2)x nanocomposites (x = 0, 1, 5, 10, 20 wt.%). Moessbauer spectra were measured at room temperature with registration in 4,096 channels and further presentation in 1,024 channels. Moessbauer spectra of CuFe2O4 and (CuFe2O4)0.99 + (SnO2)0.01 were better fitted using three sextets while spectra of (CuFe2O4)0.95 + (SnO2)0.05 and (CuFe2O4)0.80 + (SnO2)0.20 were better fitted using four sextets and one doublet. In contrast, spectrum of (CuFe2O4)0.80 + (SnO2)0.20 was better fitted using five sextets and one doublet. Moessbauer hyperfine parameters were related to octahedral and tetrahedral sites in copper ferrites. The presence of two different tetrahedral sites in studied ferrites and two different octahedral sites in (CuFe2O4)0.80 + (SnO2)0.20 was supposed.