DEVELOPMENT OF THERMOELECTRIC Co-XIDES

从环境的角度来看，我们需要研究和开发新的热电氧化物，这些热氧化物可以改变从自动车辆、热植物喷射到电气的高温热量。在一种坚实的状态材料中，在两条边缘之间存在温度差异，存在着电动力的性质与温度差异。高效率的热电材料包括低电抵抗力、低热条件和巨像热功率。在高温（500 - 800摄氏度）下，材料通常被氧化化。如果氧化物被雇佣了，不管怎样，应该没有问题。Furthermore，高Tc氧化物的发现导致了高诱导性共过氧化物氧化物的成功合成。从这一点来看，目前的项目已经处理了Bi_（2-x）Pb_XSr_（3-y）Y_yCo_2O（_9-δ）多晶林陶瓷，研究了通过改变x/y比率和优化热电效应的动力学的最佳热力学材料。作为一个结果，Y-掺杂在热电性能中具有显著的影响，通过三个订单减少抵抗力，并将该材料从绝缘体转化为导体。由于该化合物含有与热氧化物效应的动力学相互干扰的影响，Bi_（1.5）Pb_（0.5）Ca_（2-x）M_xCo_2O_（8-δ）已准备好了这一氧化物，因为它不包含污染阶段。通过Sc^（3+）、Y^（3+）或La^（3+） ·替换从0到0.3的人数x，合作空间已经改变。Then thermoelectric properties （抵抗力和热功率）和magnetic properties been measured。从磁性计量指标指标估计的有效磁性时刻，使Co_g和O2 p水平之间的电荷-转移-能量可以主要计入热电性能。在这一点上，特异性的氧溶解度和强度变形对热电特性也有重大影响。

From the environmental viewpoint, we need the research and development of new thermoelectric oxides that can transform the high temperature heat in the gases ejected from automobiles, thermal plants and so on to electricity. In a solid state material that has the temperature difference between two edges, there is the electromotive force proportional to the temperature difference. The high effective thermoelectric material contains low electric resistivity, low thermal conductivity and colossal thermopower. At high temperature (500℃-800℃), usually materials are oxidized. If oxides are employed, however, there should be no problems. Furthermore, the discovery of high Tc oxides leads to the successful syntheses of high conductive Co-perovskite oxides. From this point of view, the present project has treated Bi_(2-x)Pb_XSr_(3-y)Y_yCo_2O(_9-δ) polycrystalline ceramics, explored the best thermopower material by changing the x/y-ratio and then elucidated the kinetics of the thermoelectric effect. As a result, Y-doping has the significant effect in the thermoelectric properties, reducing the resistivity by three orders and transforming this material from the insulator to the conductor. Since this compound contains impurity phases that interfere with the elucidation of the kinetics of the thermopower effect, Bi_(1.5)Pb_(0.5)Ca_(2-x)M_xCo_2O_(8-δ)has been prepared because this oxide does not contain impurity phases. By Sc^(3+)、Y^(3+) or La^(3+) ・ substitution for Mand changing x from 0 to 0.3, the Co-O spacing has been changed. Then thermoelectric properties (resistivity and thermopower) and magnetic properties have been measured. The effective magnetic moments estimated from the magnetic measurements indicate that the charge-transfer-energy between Co e_g and O 2p levels can mainly account for the thermoelectric properties. Besides this, oxygen solubility and attice deformation in the specimens contain also important effects on the thermoelectric features.