Electrical transport properties and complex impedance investigation of Fe3+ and La3+ co-doping (Pb,Sr)TiO3 thin films

Author(s)

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]}

Affiliation

^[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

• Document type: Journal article
• Source: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS; v. 236, p. 179-188, OCT 2018.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 11/20536-7 - Multifunctional Ferroelectric Materials: Studies of Optical, Electrical and Photoluminescent Properties.
• Grantee: Debora da Silva Lima Pontes
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 12/14106-2 - Designe multifunctional oxides with perovskite architecture (Pb, Sr, La, BI) (Ti, Fe) O3
• Grantee: Fenelon Martinho Lima Pontes
• Support Opportunities: Regular Research Grants