Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 96, Issue 1, Pages 209-217Publisher
WILEY
DOI: 10.1111/jace.12020
Keywords
-
Categories
Funding
- CNPq
- CAPES
- FAPESP
- National Laboratory of Synchrotron Light, LNLS-Campinas, SP, Brazil [11011]
Ask authors/readers for more resources
Ca1+xCu3-xTi4O12 powders were synthesized by a conventional solid-state reaction. X-ray diffraction (XRD) was performed to verify the formation of cubic CaCu3Ti4O12 (CCTO) and orthorhombic CaTiO3 (CTO) phases at long range. Rietveld refinements indicate that excess Ca atoms added to the Ca1-xCu3-xTi4O12 (x = 1.0) composition segregated in a CaTiO3 secondary phase suggesting that solubility limit of Ca atoms in the CaCu3Ti4O12 lattice was reached for this system. The FE-SEM images show that the Ca1+xCu3-xTi4O12 (0 < x < 3) powders are composed of several agglomerated particles with irregular morphology. X-ray absorption near-edge structure spectroscopy (XANES) spectra indicated [TiO5Voz]-[TiO6] complex clusters in the CaCu3Ti4O12 structure which can be associated with oxygen vacancies (Voz = Vox, Vo, and Vo) whereas in the CaTiO3 powder, this analysis indicated [TiO6][TiO6] complex clusters in the structure. Ultraviolet-visible (UVvis) spectra and photoluminescence (PL) measurements for the analyzed systems revealed structural defects such as oxygen vacancies, distortions, and/or strains in CaCu3Ti4O12 and CaTiO3 lattices, respectively.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available