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本文以流变相反应法原位合成了聚对苯撑/LiNi_(0.5)Fe_2O_4纳米复合热电材料,并对其热电性能进行表征,研究了放电等离子烧结时保温时间对其热电性能的影响.结果发现,复合材料铁氧体颗粒粒径为100—300 nm,其外部被一层聚对苯撑膜包覆.电子在Fe~(2+)和Fe~(3+)之间的跳跃机理在铁氧体电导中占主导作用,因此聚对苯撑/LiNi_(0.5)Fe_2O_4复合材料具有n型导电特性.随着保温时间增加,复合材料电导率基本不变,但热导率逐渐增大且Seebeck系数逐渐减小,导致热电优值系数降低.由于结合了有机物高电导率和低热导率以及无机材料高赛贝克系数的优点,所制备的复合材料热电性能较单一材料有较大提高.
In this paper, poly (p-phenylene oxide) / LiNi_ (0.5) Fe_2O_4 nanocomposite thermoelectric materials were synthesized in situ by rheological phase reaction method, and their thermoelectric properties were characterized. The effect of holding time on the thermoelectric properties during discharge plasma sintering was investigated. , The composite ferrite particles have a particle size of 100-300 nm and are externally coated with a layer of polyphenylene oxide film.The jumping mechanism of electrons between Fe 2+ and Fe 3+ is as follows: Therefore, the poly (p-phenylenevinylene) / LiNi_ (0.5) Fe_2O_4 composites have n-type conductivity.With the increase of holding time, the conductivity of the composites does not change, but the thermal conductivity gradually increases and Seebeck Coefficient decreases gradually, which leads to the reduction of the thermoelectric figure of merit.Because of combining the advantages of high conductivity and low thermal conductivity of organic materials and high Seebeck coefficient of inorganic materials, the thermoelectric properties of the prepared composite materials are greatly improved compared with a single material.