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Recommended Papers for: J. J. Yuan

Total Papers Found: 6

Thermoelectric Properties of Ca1−xGdxMnO3−delta (0.00, 0.02, and 0.05) Systems

The thermoelectric properties of the Ca1-xGdxMnO3-delta system where x= 0.00, 0.02, and 0.05 were evaluated. It was determined that the sample with the lowest electrical resistivity was the Ca0.95Gd0.05MnO3-delta sample. This result was attributed to the increase content of Mn3+ in the Mn4+ matrix resulting from doping of gadolinium. The dominant charge carriers in all samples were holes, as the thermopower was negative. The highest thermoelectric figure of ...

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The effects of Si doping on the thermoelectric and magnetic properties of Ca0.98Bi0.02Mn1−xSixO3−delta with x = 0.00, 0.02 and 0.03

Single phase, orthohombic structured Ca0.98Bi0.02Mn1−xSixO3−delta (x = 0.00, 0.02 and 0.03) samples were prepared using solid state reaction. The authors investigated whether they could improve the thermoelectric properties of the product by substituting calcium and manganese with bismuth and silicon, respectively. The resulting products had an increase in electrical resistivity and thermopower and a decrease in thermal conductivity as the amount of silicon added increased. Magnetic moments decreased in the ...

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Correlation Between the Electronic Structure and the Thermoelectric Properties of Gd-Doped CaMnO3−delta 

The effects of the substitution of Ca with Gd in the Ca1-xGdxMnO3-delta system were investigated. It was determined that the partial substitution of Gd resulted in decreased resistivity and increased thermal conductivity. The change in these properties was attributed to electronic effects....

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Thermoelectric properties of n-type Ca1-xBixMnO3-delta (0.00, 0.02, and 0.05) system

Calcium is partially substituted by bismuth in the Ca1-xBixMnO3-delta (x=0.00, 0.02, and 0.05) system in order to determine how this substitution affects the electrical resistivity, thermopower, and thermal conductivity. The experimental results were then used to calculate the thermoelectric figure of merit for each sample. The highest observed figure of merit was 0.047, which represented a 487% increase over the unsubstituted sample....

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Thermoelectric and Magnetic Properties of Ca0.98RE0.02MnO3d (RE = Sm, Gd, and Dy)

Samples of Ca0.98RE0.02MnO3- delta (RE = Sm, Gd, and Dy) were tested for their thermoelectric and magnetic properties. It was determined that 2% doping at the Ca site with rare-earth elements reduced the electrical resistivity and thermal conductivity in comparison to the undoped material....

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