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Thermal Conductivity of Nano ZnO Doped CaFe2O4

The research objective of this study was to examine whether Zn was an effective doping element for thermal conductivity. Ca1-xZnxFe2O4 (x = 0.0–0.5) were synthesized by solid state reaction method. The XRD results showed that all samples were mixed phase of CaFe2O4 and ZnFe2O4. The structure of Ca1-xZnxFe2O4 (x = 0.0–0.5) belonged to a group of an orthorhombic system (space group: Pbnm). It was observed that all the samples of Ca1-xZnxFe2O4 (x = 0.0–0.5) had positive Seebeck coefficient as shown on p-type semiconductor behavior. Thus thermal conductivity tended to decrease with increasing x value. The Ca0.6Zn0.4Fe2O4 showed lowest thermal conductivity of 6.52 W m−1 K−1 at 473 K, which was lower than 50.81% of CaFe2O4. These results suggested that Zn was an effective doping element for improving the thermal conductivity of Ca1-xZnxFe2O4.