| Texto completo | |
| Autor(es): |
Pontes, F. M.
[1]
;
Pontes, D. S. L.
[1]
;
Chiquito, A. J.
[2]
;
Colmenares, Y. N.
[3]
;
Mastelaro, V. R.
[3]
;
Longo, E.
[4, 1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Estaritial Paulista, UNESP, Dept Chem, POB 473, BR-17033360 Bauru, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Phys, NanO LaB, Via Washington Luiz, Km 235, POB 676, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Sao Paulo, Phys Inst Sao Carlos IPSC, Sao Carlos, SP - Brazil
[4] Univ Fed Sao Carlos, Dept Chem, CDMF, LIEC, Via Washington Luiz, Km 235, POB 676, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS; v. 236, p. 179-188, OCT 2018. |
| Citações Web of Science: | 0 |
| Resumo | |
This work investigates the impact of Fe3+ and La3+ co-doping on the structural, electrical transport and dielectric relaxation properties of PST thin films. XRD and Raman spectroscopy data show that the Fe3+ and La3+ 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. (AU) | |
| Processo FAPESP: | 11/20536-7 - Materiais Ferroelétricos Multifuncionais: Estudos das Propriedades Ópticas, Elétricas e Fotoluminescente. |
| Beneficiário: | Debora da Silva Lima Pontes |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 12/14106-2 - Designe de óxidos multifuncionais com arquitetura perovskite (Pb,Sr,La, Bi) (Ti,Fe) O3 |
| Beneficiário: | Fenelon Martinho Lima Pontes |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |