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Electronic active defects and local order in doped ZnO ceramics inferred from EPR and Al-27 NMR investigations
Sun, Qianying; Tian, Tian; Zheng, Laoying; Man, Zhenyong; Li, Guorong; Barre, Maud; Dittmer, Jens; Bulou, Alain; Kassiba, Abdel Hadi
2019-08-01
Source PublicationJOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN0955-2219
Volume39Issue:10Pages:3070
SubtypeArticle
AbstractDoped ZnO based ceramics were fabricated by using a solid state reaction of ZnO co-doped by TiO2, Al2O3 and MgO and sintered in different atmospheres (Air, N-2, N-2 + CO). The crystalline structures consist in wurtzite ZnO and a minor spinel phase Zn2TiO4. The electrical conductivity is modulated by the sintering conditions with the highest value ((similar to)10(5) S m(-1)) obtained in the reducing atmosphere (N-2 + CO). The role of defects and vacancies on the electrical behavior was exhaustively investigated by Raman, electron paramagnetic resonance (EPR) and solid state NMR methods. The paramagnetic centres inferred from EPR studies show a Pauli-like spin susceptibility. Their origin was assigned to shallow donors from interstitial defects (Zn-i) favored by substitutional Al ions (Al-zn). The NMR spectral features with a characteristic 185 ppm line which correlates with the electrical conductivity are presumed to be caused by the Knight shift effect from the conduction electrons and the involved paramagnetic centres.
KeywordZnO ceramics Doping EPR NMR Conductivity
DOI10.1016/j.jeurceramsoc.2019.04.024
Language英语
WOS Research AreaMaterials Science
PublisherELSEVIER SCI LTD
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/26953
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Sun, Qianying,Tian, Tian,Zheng, Laoying,et al. Electronic active defects and local order in doped ZnO ceramics inferred from EPR and Al-27 NMR investigations[J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,2019,39(10):3070.
APA Sun, Qianying.,Tian, Tian.,Zheng, Laoying.,Man, Zhenyong.,Li, Guorong.,...&Kassiba, Abdel Hadi.(2019).Electronic active defects and local order in doped ZnO ceramics inferred from EPR and Al-27 NMR investigations.JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,39(10),3070.
MLA Sun, Qianying,et al."Electronic active defects and local order in doped ZnO ceramics inferred from EPR and Al-27 NMR investigations".JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 39.10(2019):3070.
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