Electrical transport properties and complex impedance investigation of Fe 3+ and La 3+ co-doping (Pb,Sr)TiO 3 thin films
Carregando...
Arquivos
Fontes externas
Fontes externas
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Tipo
Artigo
Direito de acesso
Acesso aberto
Arquivos
Fontes externas
Fontes externas
Resumo
This work investigates the impact of Fe 3+ and La 3+ co-doping on the structural, electrical transport and dielectric relaxation properties of PST thin films. XRD and Raman spectroscopy data show that the Fe 3+ and La 3+ doping induce a pseudocubic to tetragonal structural phase transformation. Schottky barrier heights calculated from temperature-dependent current–voltage plots for the PST, PSTF and PSLTF films decreased to 1.20, 0.59, and 0.36 eV, respectively. This behavior was directly assigned to the increase in oxygen vacancies. The frequency dependence of sample's impedance revealed the presence of the typical electrical relaxation phenomenon in all films. Activation energies calculated from the imaginary part of the impedance are 1.73 and 0.57 eV: the high value (1.73 eV, PST films) suggests the presence of long-range oxygen vacancy diffusion, while the lower one (0.57 eV PSLTF films) should be associated to the short-range oxygen vacancy diffusion.
Descrição
Palavras-chave
Dielectric relaxation, Electrical transport, Impedance spectroscopy, Thin films
Idioma
Inglês
Citação
Materials Science and Engineering B: Solid-State Materials for Advanced Technology, v. 236-237, p. 179-188.
