Sintering Behaviour of ZnO:Cu Ceramics Fabricated by Sol-Gel Derived Powders
Z.B. Bahşia, A.Y. Orala, M.H. Aslanb, E. Kayahanc, d and M. Ozere
aDept. of Materials Science and Engineering, Gebze Institute of Technology, 41400, Kocaeli, Turkey
bDept. of Physics, Gebze Institute of Technology, 41400, Kocaeli, Turkey
cGebze MYO, Kocaeli University, 41420, Kocaeli, Turkey
dNatural and Applied Sci. Inst. Electro-optic and Sys. Eng. Umuttepe, Kocaeli University, 41380, Kocaeli, Turkey
eDept. of Physics, Istanbul Kultur University, 34156, Istanbul, Turkey
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Doped zinc(II) oxide (ZnO:Cu) ceramics were prepared from sol-gel derived nanocrystalline powders. Powders were prepared by dissolving zinc and copper acetates in isopropyl alcohol. Ethanolamine was used to enhance the solubility of acetates. Powders were produced by the calcination of the dried gels at 750°C. The crystal size of the undoped powders were uniform: and around 50 nm while grain size of Cu doped powders varied between 0.3 and 2 μm. X-ray mapping of the powders showed that Cu was not homogeneously distributed and some particles had higher Cu content. After pressing of the powders, both doped and undoped ceramics were sintered at 1200°C for 2 h. Microstructure of the Cu doped ceramics showed that Cu atoms partially dissolved in ZnO matrix and the rest formed a second phase in the grain boundaries. Average grain size of the ZnO:Cu ceramics was around 30 μm. Relative densities of the ceramics increased from 0.695 to 0.857 by Cu doping.
DOI: 10.12693/APhysPolA.121.271
PACS numbers: 81.05.Je, 81.05.Mh