Correlation Between Photoluminescence and Structural Defects in   Ca   1+ x    Cu   3 −  x    Ti   4   O   12  Systems | Zendy

Oliveira Larissa H. | Zendy; Paris Elaine C. | Zendy; Avansi Waldir | Zendy; Ramirez Miguel A. | Zendy; Mastelaro Valmor R. | Zendy; Longo Elson | Zendy; Varela José A. | Zendy

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Correlation Between Photoluminescence and Structural Defects in Ca 1+ x Cu 3 − x Ti 4 O 12 Systems

Author(s) -

Oliveira Larissa H.,

Paris Elaine C.,

Avansi Waldir,

Ramirez Miguel A.,

Mastelaro Valmor R.,

Longo Elson,

Varela José A.

Publication year - 2013

Publication title -

journal of the american ceramic society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.9

H-Index - 196

eISSN - 1551-2916

pISSN - 0002-7820

DOI - 10.1111/jace.12020

Subject(s) - orthorhombic crystal system , photoluminescence , xanes , materials science , crystallography , rietveld refinement , powder diffraction , x ray crystallography , spectroscopy , analytical chemistry (journal) , absorption spectroscopy , crystal structure , diffraction , chemistry , physics , quantum mechanics , optics , optoelectronics , chromatography

Ca 1+ x Cu 3 − x Ti 4 O 12 powders were synthesized by a conventional solid‐state reaction. X ‐ray diffraction ( XRD ) was performed to verify the formation of cubic CaCu 3 Ti 4 O 12 ( CCTO ) and orthorhombic CaTiO 3 ( CTO ) phases at long range. Rietveld refinements indicate that excess Ca atoms added to the Ca 1 − x Cu 3 − x Ti 4 O 12 ( x = 1.0) composition segregated in a CaTiO 3 secondary phase suggesting that solubility limit of Ca atoms in the CaCu 3 Ti 4 O 12 lattice was reached for this system. The FE‐SEM images show that the Ca 1+ x Cu 3 − x Ti 4 O 12 (0 < x < 3) powders are composed of several agglomerated particles with irregular morphology. X ‐ray absorption near‐edge structure spectroscopy ( XANES ) spectra indicated [ TiO 5 V o z ]‐[ TiO 6 ] complex clusters in the CaCu 3 Ti 4 O 12 structure which can be associated with oxygen vacancies (V o z = V o x , V o • , and V o •• ) whereas in the CaTiO 3 powder, this analysis indicated [ TiO 6 ]–[ TiO 6 ] complex clusters in the structure. Ultraviolet‐visible ( UV –vis) spectra and photoluminescence ( PL ) measurements for the analyzed systems revealed structural defects such as oxygen vacancies, distortions, and/or strains in CaCu 3 Ti 4 O 12 and CaTiO 3 lattices, respectively.

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