Processing and Application of Ceramics 2022 Volume 16, Issue 2, Pages: 134-142
https://doi.org/10.2298/PAC2202134A
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Sintering of layered ferrite-BaTiO3 ceramics: Analysis of interfaces and effects of shrinkage mismatch
Amarante Mayara Dos Santos (Instituto Tecnológico de Aeronáutica - Programa de Pós-Graduação em Ciências e Tecnologias Espaciais, Praça Marechal Eduardo Gomes, São José dos Campos, Brazil)
Santos Júlia Maria de Morais (Departamento de Ciência e Tecnologia Aeroespacial - Instituto de Estudos Avançados, Putim, São José dos Campos, Brazil)
Machado João Paulo Barros (Instituto Nacional de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais, Jardim da Granja, São José dos Campos, Brazil)
Lente Manuel Henrique (Universidade Federal de São Paulo, Instituto de Ciência e Tecnologia, São José dos Campos, Brazil)
de Brito Vera Lúcia Othéro (Departamento de Ciência e Tecnologia Aeroespacial - Instituto de Estudos Avançados, Putim, São José dos Campos, Brazil), veravlob@fab.mil.br
In the present work, densification and microstructure evolution of cobalt
ferrite (FCO), nickel-cobalt ferrite (FNICO) and BaTiO3 (TB) ceramics under
different sintering conditions were investigated. Subsequently, layered
ferrite-BaTiO3 samples were formed by uniaxial pressing of the corresponding
ceramic powders. These green samples were sintered with two different
sintering schedules, aiming to study the ferrite-BaTiO3 interfaces after
sintering. The analyses were made at the cross section of the interfaces and
at the interface surfaces after separation of the layers. The sintered
layered samples were utilized to analyze sintering mismatch, diffusion at
the interfaces and identification of some newly formed phases. EDS analysis
across the TB-FCO interface showed evidences of diffusion. It was observed
that the FNICO layers were detached from TB during sintering, but the same
was not observed in the TB-FCO samples, although shrinkage mismatch resulted
in some defects. XRD analyses suggested the presence of Ti2O at the TB-FCO
interface and BaTiNiFe10O19 at the TB-FNICO interface as products of the
reactions between the ferrites and BaTiO3.
Keywords: multiferroics, ferrites, BaTiO3, sintering, interface structure
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