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Defects and microstructure of highly conducting Al-doped ZnO ceramics obtained via spark plasma sintering

Abstract : Al-doped ZnO ceramics were sintered by conventional sintering method and spark plasma sintering (SPS) respectively. Electrical properties and microstructure have been investigated by various measurements. The samples sintered via SPS exhibit a huge electrical conductivity, up to 3.0 × 105 S/m at room temperature, which was much higher than that of the sample sintered via the conventional sintering. Structural and morphorlogical characterizations pointed out that the further incorporation of Al ions and the absence of a secondary phase, contribute to the increase of the carrier concentration. Raman spectroscopy revealed the occurrence of structural distortions and a disorder induced by Al doping. Photoluminescence spectra were interpreted by different electronic active defects such as the defect complexes (AlZn-Zni) which play a key for the high electrical conductivity. Thus, SPS and Al doping modified the microstructure and the concentration of the electronic active defects to ensure high electrical conductivities in doped ZnO-based ceramics.
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Submitted on : Monday, August 22, 2022 - 3:48:33 PM
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Haoxian Chen, Qianying Sun, Tian Tian, Liaoying Zheng, Maud Barré, et al.. Defects and microstructure of highly conducting Al-doped ZnO ceramics obtained via spark plasma sintering. Journal of the European Ceramic Society, Elsevier, 2020, 40 (15), pp.5529-5534. ⟨10.1016/j.jeurceramsoc.2020.06.030⟩. ⟨hal-03219941⟩

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