Development and Characterization of Titanium Dioxide Ceramic Substrates with High Dielectric Permittivities
by
Antonio E. Freitas 1,2,*
, Taise M. Manhabosco 3, Ronaldo J. C. Batista 3, Alan K. Rêgo Segundo 4, Humberto X. Araújo 5, Fernando Gabriel S. Araújo 3 and Adilson R. Costa 1
Antonio E. Freitas 1,2,*, Taise M. Manhabosco 3, Ronaldo J. C. Batista 3, Alan K. Rêgo Segundo 4, Humberto X. Araújo 5, Fernando Gabriel S. Araújo 3 and Adilson R. Costa 1
1
REDEMAT-Laboratório de Engenharia de Superfícies e Técnicas Afins–LESTA, Centro Histórico, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
2
Departamento de Tecnologia em Engenharia Civil, Computação e Humanidades–DTECH, Campus Alto Paraopeba, Universidade Federal de São João del Rei, 36301-158 Ouro Branco, Brazil
3
Departamento de Física–DEFIS/REDEMAT, Campus Universitário Morro do Cruzeiro, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
4
Departamento de Engenharia de Controle e Automação–DECAT, Campus Universitário Morro do Cruzeiro, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
5
Colegiado de Engenharia Elétrica, Universidade Federal do Tocantins, 77600-000 Palmas, Brazil
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 386; https://doi.org/10.3390/ma13020386
Received: 21 November 2019 / Revised: 3 January 2020 / Accepted: 7 January 2020 / Published: 14 January 2020
(This article belongs to the Special Issue Sintering and Grain Growth Behavior of Ceramics)
Titanium dioxide substrates have been synthesized by means of solid-state reactions with sintering temperatures varying from 1150 °C up to 1350 °C. X-ray diffraction and scanning electron microscopy (SEM) where employed to investigate the crystal structure, grain size and porosity of the resulting samples. The obtained ceramics are tetragonal (rutile phase) with average grain sizes varying from 2.94 µm up to 5.81 µm. The average grain size of samples increases with increasing temperature, while the porosity decreases. The effect of microstructure on the dielectric properties has been also studied. The reduction of porosity of samples significantly improves the dielectric parameters (relative dielectric permittivity and loss tangent) in comparison to those of commercial substrates, indicating that the obtained ceramic substrates could be useful in the miniaturization of telecommunication devices.
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MDPI and ACS Style
Freitas, A.E.; Manhabosco, T.M.; Batista, R.J.C.; Segundo, A.K.R.; Araújo, H.X.; Araújo, F.G.S.; Costa, A.R. Development and Characterization of Titanium Dioxide Ceramic Substrates with High Dielectric Permittivities. Materials 2020, 13, 386.
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