Probing the effects of oxygen-related defects on the optical and luminescence properties in CaCu3Ti4O12 ceramics

Autor(es)

Felix, A. A. ^[1] ; Spreitzer, M. ^[2] ; Vengust, D. ^[2] ; Suvorov, D. ^[2] ; Orlandi, M. O. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Chem Inst, Phys Chem Dept, UNESP, Araraquara, SP - Brazil

^[2] Jozef Stefan Inst, Adv Mat Dept, Ljubljana - Slovenia

• Tipo de documento: Artigo Científico
• Fonte: Journal of the European Ceramic Society; v. 38, n. 15, p. 5002-5006, DEC 2018.
• Citações Web of Science: 1

Resumo

The formation of oxygen-related lattice defects and their influence on optical and electronic properties in CaCu3Ti4O12 (CCTO) ceramics were studied by controlling the oxygen partial pressure during the sintering process at high temperatures. The samples were analyzed using complementary bulk spectroscopic techniques such as photoluminescence spectroscopy, ultraviolet-visible spectroscopy, Fourier-transform infrared spectroscopy, and electron paramagnetic resonance. Our comprehensive study shows that the oxygen content during sintering process exerts considerable control over the type and concentration of oxygen-related defects in the crystalline CCTO structure. Our results also suggest that the formation of different types of oxygen-related defects in the structure modifies electronic energy levels and thus directly affects the electronic and optical properties of the CCTO phase. These results provided further insight into the important role of oxygen in the crystalline defect arrangement in polycrystalline CCTO ceramics. (AU)

• Processo FAPESP: 09/00367-6 - Estudo das Propriedades de Filmes Nanoestruturados de CaCu3Ti4O12
• Beneficiário: Anderson André Felix
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/14647-6 - Sensores de gás a base de óxidos semicondutores do tipo-p: estudos avançados in-situ e operando
• Beneficiário: Anderson André Felix
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 12/51195-3 - Modeling effects of sensor response of semiconducting oxide with functionalized nanoparticles
• Beneficiário: José Arana Varela
• Modalidade de apoio: Auxílio à Pesquisa - Regular