Structural, electrical and optical properties of (K,Ba)(Nb,Ni)O3-delta electroceramics: Oxygen vacancy and grain size effects

Author(s)

Guerra, J. D. S. ^{[1, 2]} ; Silva, M. C. O. ^[1] ; Silva, A. C. ^[1] ; Oliveira, M. A. ^[1] ; Mendez-Gonzalez, Y. ^[3] ; Monte, A. F. G. ^[4] ; M'Peko, J-C ^[2] ; Hernandes, A. C. ^[2]

Affiliation

^[1] Univ Fed Uberlandia, Inst Fis, Grp Ferroeletr & Mat Multifuncionais, BR-38408100 Uberlandia, MG - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, Grp Nanomat & Ceram Avancadas, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ La Habana, Inst Ciencia & Tecnol Mat, Fac Fis, Havana 10400 - Cuba

^[4] Univ Fed Uberlandia, Inst Fis, Grp Opt & Fototerm, BR-38408100 Uberlandia, MG - Brazil

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 46, n. 12, p. 20201-20206, AUG 15 2020.
• Web of Science Citations: 0

Abstract

KNbO3-based ferroelectric materials have been largely investigated as a result of many interesting physical properties that make them suitable for designing multifunctional electronic components. In particular, ferroelectric (1-x)KNbO3-xBaNi(1/2)Nb(1/2)O(3-delta) (KBNN) solid solutions have received special attention for optical applications, including for high-performance photovoltaic devices. In this work, KBNN ceramics were produced via conventional solid-state sintering, followed by a comprehensive study of their (micro)structural, electrical and optical properties. The processed data are analyzed and discussed in terms of the effect from structural oxygen-vacancy defects in such materials and from the grain size, in the specific case of the observed electrical response. Overall, the results suggest these perovskite-structured semiconducting ferroelectric oxides as a good alternative for solar cell applications. (AU)

• FAPESP's process: 18/24352-7 - Development and Study of Electroceramic Materials with Technological Interest
• Grantee: Antônio Carlos Hernandes
• Support Opportunities: Research Grants - Visiting Researcher Grant - Brazil