热压烧结增强Ca3Co4O9多晶的c轴择优织构和电输运性质的研究*

doi:10.11896/j.issn.1005-023X.2017.04.002

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Abstract Ca₃Co₄O₉ polycrystalline bulks were respectively prepared via solid-state reaction sintering in air and further hot-press sintering in vacuum. The influences of hot-press sintering on the texture and electrical transport properties of polycrystals were comparatively studied by the measurements of XRD, SEM, density, temperature dependent resistivity curve and Hall effect. The results showed that the polycrystalline bulks prepared via two different methods were all of c-axis preferred orientation. The c-axis orie-ntation and density were significantly enhanced after hot-press sintering, while the crystallization quality declined slightly owing to oxygen deficiency after sintering in vacuum. The hot-press sintered polycrystal exhibited much lower resistivity which was only one-seventh of pressureless sintered sample′s at room temperature, and the resistivity increased with decreasing temperature. This was mainly due to the dominant electrical transportation along the crystal ab-plane and increased Co⁴⁺ carrier mobility resulting from the enhanced (00l) preferential texture and less scattering effects at grain boundaries and defects.

Key words： Ca₃Co₄O₉ polycrystal hot-press sintering c-axis orientation electrical transport

Published: 25 February 2017 Online: 2018-05-02

CLC number:

TB34

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