YBa2Cu3Oyの高温における電気抵抗と熱起電力

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Effect of Fe substitution for Cu(up to 3at%) on the high temperature phase equilibria of YBa2 Cu3 Oy was investigated under various oxygen partial pressures by electrical conductivity, thermoelectric power measurements and X-ray diffraction. The YBa2 (Cu1-x Fex )3 Oy (x=0-0.03) had orthorhombic structure at room temperature. The electrical conductivity of YBa2 (Cu1-x Fex )3 Oy (x=0-0.03) increased abruptly at about 450°C and the temperature dependence of the resistivity showed a slope change at the temperature which corresponds to the orthorhombic-tetragonal transition. Arrhenius plots of the electrical conductivities of YBa2 (Cu1-x Fex )3 Oy measured under various Po2 consisted of five straight lines. The temperatures at which the straight lines intersected were confirmed to correspond to the phase transition temperatures, which markedly decreased with increasing Fe content(x). The thermoelectric power of YBa2 (Cu1-x Fex )3 Oy (x=0-0.03) is negative across the entire temperature range and Po2 range investigated, which indicates that YBa2 - (Cu1-x Fex )3 Oy (x=0-0.03) is of n-type. The temperature dependence of the thermoelectric power was very similar to that of the electrical resistivity.
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