Publication: Cold sintering process of ZnO ceramics: effect of the nanoparticle/microparticle ratio
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2020-12
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Elsevier
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We show the efficiency in the preparation of 95% dense ZnO ceramics by cold sintering process through the incorporation of ZnO nanoparticles in the 1-10 wt% range at temperatures of 170 degrees C, pressures of 750 MPa and a pellet height/diameter ratio of 0.38. Morphological, structural and physical properties are dependent on the amount of ZnO nanoparticles incorporated into the system. After the densification by cold sintering process, ZnO ceramics show a reduction of the average valence indicating the deficiency of oxygen, similar to ceramics sintered by the conventional route. Besides, the generation of structural disorder and modifications into the ZnO lattice are identified in sintered ceramics, inducing intrinsic defects related to the loss of oxygen ions, the diffusion of zinc and zinc vacancies, which depend on the sintering process and the starting powders. These characteristics influence the final functional properties of the sintered ZnO ceramics, such as the visible photoluminescence signal.
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© 2020 Elsevier Ltd. All rights reserved.
This work has been supported by the Ministerio Espanol de Ciencia, Innovacion y Universidades (MCIU) through the projects MAT201786540-C4-1-R, MAT2017-86540-C4-3-R and RTI2018-095303-A-C52. The European Synchrotron (ESRF), MCIU and Consejo Superior de Investigaciones Cientificas (CSIC) are acknowledged for the provision of synchrotron radiation facilities. We also thank the BM25-SpLine staff for the technical support beyond their duties. A.S. acknowledges financial support from the Comunidad de Madrid for an "Atraccion de Talento Investigador" contract (No. 2017-t2/IND5395).