Influence of SnO2 concentration on electrical response of alpha-Fe2O3 sintered with different thermal history conditions

Autor(es)

Destro, Fabricio B. ; Sczancoski, Julio C. ; Soares, Mario R. S. ; Leite, Edson R.

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 46, n. 17, p. 7-pg., 2020-12-01.

Resumo

Hematite (alpha-Fe2O3) has been investigated as a promising material for the development of renewable energy technologies. However, intrinsic poor electrical conductivity and fast charge-carrier recombination rate of alpha-Fe2O3 are the limiting factors for such applications. A suitable approach to overcome these limitations is the insertion of electron-donor species into the alpha-Fe2O3 structure. This study describes the effects of incorporating SnO2 with different thermal histories on the electrical properties of alpha-Fe2O3. The sintering temperature at 1300 degrees C was responsible for a significant increase in the average grain sizes compared to the samples sintered at 1100 degrees C. Lower resistivity values were observed in samples obtained at 1100 degrees C with 2.0 wt% SnO2. As such, SnO2 was found to be an excellent modifying agent to favor the overall alpha-Fe2O3 electrical conductivity. Solid-state impedance spectroscopy was adopted as a versatile tool to analyze the occurrence of preferential grain boundaries for electrical current flow. (AU)

• Processo FAPESP: 17/03135-5 - Contornos de grãos em materiais eletro-cerâmicos: compreendendo a natureza e sua função na hematita (Fe2O3)
• Beneficiário: Edson Roberto Leite
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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: 12/14004-5 - Investigação das propriedades fotoluminescentes e fotocatalíticas de pós de BaWO4 e BaMoO4 puros e dopados com Mn, Cu e Zn
• Beneficiário: Júlio César Sczancoski
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado