Thermoelectric Properties of La1-xSrxCuO2 5-δ/SrTiO3 Composite Materials

  • 安 旭花

Student thesis: Master's Thesis

Abstract

Thermoelectric materials and devices have been widely used in the fields of energy conversion sensors and thermoelectric cooling The ceramic thermoelectric materials are also well-known as environmentally friendly La1-xSrxCuO2 5-δ shows a good metallic electrical conductivity owing to its oxygen-defect perovskite structure Therefore it can be considered as one kind of thermoelectric materials The effect of adding SrTiO3 on sintering behavior and thermoelectric properties of La1-xSrxCuO2 5-δ were investigated in this study The precursor powders were prepared by solid state method After calcination at 800oC for 2 5 hours the powder shows a single phase of La0 8Sr0 2CuO2 5-δ Sintering temperature and contents of SrTiO3 become variable parameters After a sintering process at O2 atmosphere the relative density of bulk increases with increasing sintering temperature SrTiO3 inhibited the grain growth of La0 8Sr0 2CuO2 5-δ In terms of thermoelectric properties adding the SrTiO3 decreased the the electrical conductivity of bulk The highest value of electrical conductivity 880 S/cm was obtained by 0 wt% SrTiO3 sample However the Seebeck coefficient value increased with increasing the contents of SrTiO3 The highest value of Seebeck coefficient was 3550 ?V/K achieved by 5 wt% SrTiO3 sample at 350K The 5 wt% SrTiO3 sample showed the highest power factor is 9x104 ?W/mK2
Date of Award2014 Feb 7
Original languageEnglish
SupervisorChii-Shyang Hwang (Supervisor)

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