park plasma sintering and electric conductivity of anatase TiO2 nanoceramic

Autor(es)

Roca, Roman Alvarez ^[1] ; Londono Badillo, Fernando Andres ^[2] ; Eiras, Jose Antonio ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, CDMF LIEC Chem Dept, Sao Carlos, SP - Brazil

^[2] Univ Antioquia, Inst Fis, Grp Sci Instrumentat & Microelect, Medellin - Colombia

^[3] Univ Fed Sao Carlos, Phys Dept, Grp Ferro Mat, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 33, n. 7, p. 4375-4387, MAR 2022.
• Citações Web of Science: 0

Resumo

We investigated the densification and electric conductivity in uncommon ultra-fine-grained anatase TiO2 nanoceramics. These materials were prepared by Spark Plasma Sintering (SPS) at 850 degrees C and exhibited a relative density of 95% and mean grain size of 57 nm. The structural TiO2 anatase phase and microstructural characteristics were determined by XRD and SEM analyses, respectively. A main densification mechanism was proposed based on the grain size-relative density relationship, where an effective pinning effect of nanopores on agglomerates was suggested. Measurements of electric impedance and modulus revealed the influence of SPS conditions on electrical properties. The conductivity relaxation and activation energy in such dense anatase TiO2 nanoceramics were also examined. (AU)

• Processo FAPESP: 17/19548-7 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Román Alvarez Roca
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado