Study On The Correlativity Between Preparation And Structure Of Perovskite Type Oxide Thermoelectric Material LaNiO₃

Thermoelectric materials are those materials that directly convert heat to electricity or conversely. The principle of thermoelectric materials was used as the thermoelectric generators and cooling devices. Its advantage is pollution-free, no radiation, device during the operation without noise, without the need for maintenance. In recent years, many scientists studied extensively. Now, many mature thermoelectric materials is mostly metal semiconductor alloy material, under high temperature, the metal semiconductor thermoelectric material is very unstable, easy to oxidation, high cost, and it is harmful to the human body, so these metallic materials are not ideal thermoelectric materials. Contrast, the oxide thermoelectric materials has been considered to be a potential material worthy of study, because it has the good structural stability, safety and no pollution, etc. Many of the early studies of oxide thermoelectric materials, its thermoelectric properties is very low, and cannot be applied to real life, so oxide thermoelectric materials research always remain stagnant.LaNiO3of the nickel-based material is a typical perovskite system materials, in recent years, research and reported rarely. In order to improve the thermoelectric properties of A-site doping less. In this study, using the sol-gel prepared by the SmxLa1-xNi03and SrxLa1-xNiO3two kinds of thermoelectric material, and research its structure, the morphology of the samples, the transport properties of the material and the thermoelectric properties. The thermoelectric properties has been improved by using the chemical doping and the improvement of preparation method. Finally, the powder metallurgy process prepared SmxLa1-xNiO3and SrxLa1-xNiO3bulk ceramic materials, by analyzing the impact of the repression of pressure and sintering time on the sample material, then come to the thermoelectric properties of doping x changes impact.We select the excellent properties of P type of semiconductor thermoelectric materials, through the power parameters tester, test device of electrical output performance, the results show that the voltage versus temperature differential increases showing a monotonous rising trend.