Enhanced thermoelectric performance of Nb-doped SrTiO3 by nano-inclusion with low thermal conductivity.
Enhanced thermoelectric performance of Nb-doped SrTiO3 by nano-inclusion with low thermal conductivity.
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低导热率纳米夹杂物增强 Nb 掺杂 SrTiO3 的热电性能
DOI：
10.1038/srep03449
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发表时间：
2013-12-09
影响因子：
4.6
通讯作者：
Koumoto, Kunihito
中科院分区：
文献类型：
--
作者：
Wang, Ning;Chen, Haijun;He, Hongcai;Norimatsu, Wataru;Kusunoki, Michiko;Koumoto, Kunihito
作者报道了一种通过纳米夹杂物来提高导电性而降低导热性从而提高ZT值的有效途径。通过这种方法，钇稳定氧化锆（YSZ）纳米夹杂物的Nb掺杂SrTiO 3的ZT值提高了9倍。YSZ夹杂物位于晶粒内部和三重结处，通过有效的界面声子散射降低热导率，通过促进晶粒异常长大提高电导率，从而导致ZT值明显提高，这有力地表明，低热导率的纳米夹杂物不仅可以降低热导率，而且可以提高电导率。该研究将为高性能氧化物热电材料的制备提供有益的启示。
Authors reported an effective path to increase the electrical conductivity while to decrease the thermal conductivity and thus to enhance the ZT value by nano-inclusions. By this method, the ZT value of Nb-doped SrTiO 3 was enhanced 9-fold by yttria stabilized zirconia (YSZ) nano-inclusions. YSZ inclusions, located inside grain and in triple junction, can reduce the thermal conductivity by effective interface phonon scattering, enhance the electrical conductivity by promoting the abnormal grain growth and thus lead to the obvious enhancement of ZT value, which strongly suggests that, it is possible to not only reduce the thermal conductivity, but also increase the electrical conductivity by nano-inclusions with low thermal conductivity. This study will give some useful enlightenment to the preparation of high-performance oxide thermoelectric materials.
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通讯作者：
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