具有c轴择优的CuCr1-xMgxO2多晶的热电输运性质及Mg掺杂效应

doi:10.11896/cldb.18080134

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Abstract CuCr_1-xMg_xO₂(0≤x≤0.08) polycrystalline samples with c-axis orientation were prepared by solid-state reaction. The microstructure and thermoelectric transport properties of the samples were characterized by X-ray diffraction, scanning electron microscopy, resistivity-temperature and Seebeck coefficient-temperature curves. In the single-phase delafossite structure with increasing Mg doping amount within x=0—0.03, the crystal grains grow significantly along the ab-plane and (00l) lotgering factor is up to 0.53, the grain boundary and pore decrease significantly, and the density increases successively. The polycrystalline samples exhibit semiconducting electrical transport behavior according with Arrhenius thermal activation mode. The activation energy decreases from 0.273 eV to 0.031 eV, and the conductivity increases by 3—4 orders of magnitude at room temperature, the Seebeck coefficient at high temperature decreases from 481.2 μV·K^-1to 334.7 μV·K^-1and increases with the increasing temperature which due to the contribution of phonon drag in the Mg-doped samples. After x>0.03, the thermoelectric transport remain basically unchanged, the polycrystalline microstructure changes little, and the MgCr₂O₄ octahedral spinel phase is observed at the grain boundary. In conclusion, the maximum solid solubility of Mg doping is 0.03. As Mg²⁺ replace the Cr³⁺ sites, they introduce an acceptor level and expanding near the top of the valence band, causing the thermal activation energy of the electrical transport drops significantly. The increased hole carrier concentration and the stronger c-axis orientation with more transport component in ab-plane are mainly account for the conductivity enhancement. The effect of carrier mobility is secondary.

Key words： CuCr_1-xMg_xO₂ polycrystals solid solubility conductivity thermal activation energy Seebeck coefficient

Published: 29 August 2019

CLC number:

TB34

About author:: Kai Cui pursuing his master’s degree in materials science at Kunming University of Science and Technology (KMUST), focusing on the research of optoelectro-nic materials and devices.Lan Yureceived her Ph.D. degree in materials science from joint training of Kunming University of Science and Technology and Max Planck Institute for Solid State Research in 2012. Her research interests focus on the strong correlation systems and atomic layer thermopile characteristic oxides, preparation and characterization of polycrystalline ceramics and epitaxial films of semiconductor thermoelectric materials, thermoelectric and magnetic transport properties, transverse thermoelectric effects, and transport anisotropy of layered oxide films. She has published more than 50 journal papers, applied 20 national invention patents and 7 of them were authorized.

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	CUI Kai
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	QIN Meng
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Cite this article:

CUI Kai,YU Lan,LIU Anan, et al. Thermoelectric Transport Properties and Mg Doping Effect of CuCr_1-xMg_xO₂Polycrystals with c-Axis Orientation[J]. Materials Reports, 2019, 33(20): 3363-3366.

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http://www.mater-rep.com/EN/10.11896/cldb.18080134 OR http://www.mater-rep.com/EN/Y2019/V33/I20/3363

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