Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/17929
Título: | Barium titanate thin films deposited by electrophoresis on p-doped si(001) substrates |
Autor(es): | Barbosa, José Gusman Pereira, Mário R. Moura, C. Mendes, J. A. Almeida, B. G. |
Palavras-chave: | Barium Titanate Solgel Electrophoresis Barium Titanate Films Electrophoretic Deposition Annealing Raman Spectroscopy Dielectric Properties |
Data: | Out-2011 |
Editora: | American Scientific Publishers |
Revista: | Journal of Nanoscience and Nanotechnology |
Resumo(s): | Barium titanate (BaTiO3) thin films have been prepared by electrophoretic deposition on p-doped and platinum covered silicon (Si) substrates. Their structure, nanostructure and dielectric properties were characterized. The as-deposited films were polycrystalline and composed by barium titanate nanograins with an average grain size ~9 nm. Annealing at high temperatures promoted grain growth, so that the samples annealed at 600 ºC presented average grain sizes ~24 nm. From Raman spectroscopy measurements it was found that the tetragonal (ferroelectric) BaTiO3 phase was stabilized on the films. Also, at higher annealing temperatures, cation disorder was reduced on the films. From measurements of the temperature dependence of the dielectric permittivity the corresponding paraelectric-ferroelectric phase transition was determined. The observed transition temperature (~100ºC) was found to be below the BaTiO3 bulk or thick film values, due to the small nanosized grains composing the films. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/17929 |
DOI: | 10.1166/jnn.2011.3494 |
ISSN: | 1533-4880 |
Versão da editora: | http://www.ingentaconnect.com/ |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - FAMO - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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NS233 final.pdf Acesso restrito! | Documento principal | 321,38 kB | Adobe PDF | Ver/Abrir |