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A1: Low temperature materials
CuMnO2 has low bandgap and high Seebeck coefficient, it can be a candidate of thermoelectric material at low temperature. However, CuMnO2 is difficult to synthesis because it must control the oxygen atmosphere and stoichiometry in narrow range. In this study, CuO and Mn2O3 powders were used as staring materials to form the green compacts with composition of CuMn1+xO2 (x = 0 to 0.2) by cold isostatic pressing process. Then the CuMn1+xO2 sintered bulks were obtained at 1080 ℃ in argon atmosphere. The phase identification and microstructures of all bulk samples have been confirmed by XRD and SEM, respectively. The CuMn1.1O2 and CuMn1.143O2 sintered bulks showed the monoclinic structure of CuMnO2 agreed with PDF #50-0860. The relative density of CuMn1.1O2 and CuMn1.143O2 sintered samples measured by Archimedes method were 90.9 % and 91 %, respectively. The SEM images showed that the morphology of CuMn1+xO2 was layer structure, which could be helpful to decrease the thermal conductivity due to phonon scattering. Thermoelectric properties (electrical conductivity, Seebeck coefficient and thermal conductivity) of CuMn1+xO2 (x = 0~0.2) sintered bulks were measured at temperatures from 300 K to 600 K. Effects of compositions on the thermoelectric properties of CuMn1+xO2 sintered samples were investigated in this work.