Development and Characterization of Titanium Dioxide Ceramic Substrates with High Dielectric Permittivities
Antonio E. Freitas,
Taise M. Manhabosco,
Ronaldo J. C. Batista,
Alan K. Rêgo Segundo,
Humberto X. Araújo,
Fernando Gabriel S. Araújo,
Adilson R. Costa
Affiliations
Antonio E. Freitas
REDEMAT-Laboratório de Engenharia de Superfícies e Técnicas Afins–LESTA, Centro Histórico, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
Taise M. Manhabosco
Departamento de Física–DEFIS/REDEMAT, Campus Universitário Morro do Cruzeiro, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
Ronaldo J. C. Batista
Departamento de Física–DEFIS/REDEMAT, Campus Universitário Morro do Cruzeiro, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
Alan K. Rêgo Segundo
Departamento de Engenharia de Controle e Automação–DECAT, Campus Universitário Morro do Cruzeiro, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
Humberto X. Araújo
Colegiado de Engenharia Elétrica, Universidade Federal do Tocantins, 77600-000 Palmas, Brazil
Fernando Gabriel S. Araújo
Departamento de Física–DEFIS/REDEMAT, Campus Universitário Morro do Cruzeiro, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
Adilson R. Costa
REDEMAT-Laboratório de Engenharia de Superfícies e Técnicas Afins–LESTA, Centro Histórico, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Brazil
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.
