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首页> 外文期刊>ACS applied materials & interfaces >Grain Boundary Phase Segregation for Dramatic Improvement of the Thermoelectric Performance of Oxide Ceramics
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Grain Boundary Phase Segregation for Dramatic Improvement of the Thermoelectric Performance of Oxide Ceramics

机译：晶界相偏析，氧化陶瓷热电性能

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摘要

This work presents a novel approach of dramatically increasing the energy conversion efficiency of thermoelectric CaMnO3-delta ceramics through the combination of lattice dopants substitution and secondary phase segregation at the grain boundaries. The oxide ceramic samples are with the nominal composition of Ca1-xBixMnCuyO3-delta (x = 0, 0.02, 0.03; y = 0.02, 0.04). When Cu is introduced into the Ca1-xBixMnCuyO3-delta samples, the grain growth from Bi-doped CaMnO3-delta grains is accompanied by the limited solubility of Cu ions in the grain interior, whereas Cu mainly formed a CuO secondary phase at the grain boundaries. Cu nonstoichiometry addition subsequently resulted in the increase of the Seebeck coefficient and decrease of electrical resistivity simultaneously. The sample with designed chemistry of Ca2.97Bi0.03MnCu0.04O3-delta exhibits the power factor of 2.4 mW m(-1) K-2 at 337 K and figure of merit ZT of 0.67 at 773 K. This ZT of 0.67 is by far the highest ZT reported for various perovskites oxide ceramics. Such enhancements in electrical power factor and the overall ZT are attributed to the synergistic effect of decreasing the carrier concentration to increase the Seebeck coefficient and simultaneously increasing the carrier mobility through the existence of CuO phase at the grain boundaries.
机译：该工作介绍了一种新的方法，可以通过晶格掺杂剂取代和晶界的二次相偏析的组合显着提高热电CAMNO3-DELTA陶瓷能量转换效率。氧化物陶瓷样品具有Ca1-xbixmncuyo3-delta的标称组成（x = 0,0.02,0.03; y = 0.02,0.04）。当将Cu被引入Ca1-xbixmncuyo3-δ样品时，来自双掺杂Camno3-δ晶粒的晶粒生长伴随着Cu离子在晶粒内部的有限溶解度，而Cu主要在晶界形成CuO二次相。 Cu非计量量作为随后导致塞贝克系数的增加和电阻率同时降低。具有Ca2.97bi0.03mncu0.04o3-delta设计化学的样品，在337 k和773k时显示出在337 k和0.67的优异Zt的数字的功率因数。这ZT为0.67是对于各种钙钛矿氧化物陶瓷报告的最高ZT。电力因数和整体ZT的这种增强归因于降低载流子浓度的协同效应，以增加塞贝克系数，并通过在晶界处存在Cuo相同时增加载流子迁移率。

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