Effect of interface resistance on thermoelectric properties in (1-x)La${}_{0.95}$Sr${}_{0.05}$Co${}_{0.95}$Mn${}_{0.05}$O${}_3$/(x)WC composite

Abstract

In this study, the synergistic effect of the particle size of the dispersed phase and the interface thermal resistance (R${}_{int}$) between the phases on the phonon thermal conductivity (${\kappa }_{ph}$) of the (1-x)La${}_{0.95}$Sr${}_{0.05}$Co${}_{0.95}$Mn${}_{0.05}$O${}_3$/(x)WC thermoelectric composite, is demonstrated. Further, the correlation between the R${}_{int}$ and the Kapitza radius is discussed using the Bruggeman's asymmetrical model. In particular, the polycrystalline La${}_{0.95}$Sr${}_{0.05}$Co${}_{0.95}$Mn${}_{0.05}$O${}_3$ sample is synthesized using a standard-solid state route. The presence of WC nanoparticle is confirmed from the electron microscopy images. Electrical conductivity ($\sigma$) increases, and the Seebeck coefficient ($\alpha$) decreases with the increase in conducting WC volume fraction in the composite. The simultaneous increase in $\sigma$ and a decrease in ${\kappa }_{ph}$ with the WC volume fraction results in an increased figure of merit (zT) for (1-x)La${}_{0.95}$Sr${}_{0.05}$Co${}_{0.95}$Mn${}_{0.05}$O${}_3$/(x)WC composite. A maximum zT $\sim$ 0.20 is obtained for (1-x)La${}_{0.95}$Sr${}_{0.05}$Co${}_{0.95}$Mn${}_{0.05}$O${}_3$/(x)WC composite for x=0.010 at 463 K. The results obtained in the present study shows promise to design thermoelectric composites with desired phonon thermal conductivity considering the elastic properties between the phases.

15 pages, 6 figures, 1 table

References in corpus (4)

• La0.95Sr0.05CoO3: An efficient room-temperature thermoelectric oxide
• Application of flash method in the measurements of interfacial thermal resistance in layered and particulate composite materials
• Effective Thermal Conductivity of SrBi${}_4$Ti${}_4$O${}_{15}$-La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ Oxide composite: Role of Particle Size and Interface Thermal Resistance
• Thermal conductivity of PbTe-CoSb3 bulk polycrystalline composite: the role of microstructure and interface thermal resistance

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