Field-enhanced bulk conductivity and resistive-switching in Ca-doped BiFeO₃ ceramics

Abstract

Versión / Versió:Pre-print Cita bibliográfica / Cita bibliogràfica (ISO 690):MASÓ, Nahum, et al. Field-enhanced bulk conductivity and resistive-switching in Ca-doped BiFeO 3 ceramics. Physical Chemistry Chemical Physics, 2014, vol. 16, no 36, p. 19408-19416.

Induced p‐type semiconductivity in yttria‐stabilized zirconia

“…It was shown recently that electronic conduction can be introduced into Y‐doped ZrO 2 under the action of a small dc bias at high temperature . Similar conductivity increases had been observed in other acceptor‐doped systems such as Mg‐ or Zn‐doped BaTiO 3 perovskite but in those cases, the conductivity was also sensitive to p O 2 in the surrounding atmosphere, from which it was possible to determine that the carriers were p‐ type. As far as we are aware, there are no reports on the possible sensitivity of the conductivity of 8YSZ to higher values of p O 2.…”

Atmosphere- and Voltage-Dependent Electronic Conductivity of Oxide-Ion-Conducting Zr1–xYxO2–x/2 Ceramics

“…Recently, Masó and West [9] demonstrated that electronic conduction is introduced into YSZ08 under the action of a small dc bias at high temperature in air. Similar conductivity changes were seen with acceptor-doped titanate perovskites including Ca-, Zn-and Mgdoped BaTiO 3 [10][11][12] and Ca-doped BiFeO 3 [13], which all show enhanced conductivity on either increasing pO 2 in the measuring atmosphere or application of a small dc bias. The enhanced conductivity was attributed to ionization of underbonded O 2ions in the vicinity of acceptor dopants leading to hole creation on oxygen which conceptually, is the same as the creation of Oions:…”

Enhanced visible-light activities of porous BiFeO3 by coupling with nanocrystalline TiO2 and mechanism

“…The estimated work function is 4.2 eV and its Fermi level is about 0.2 eV, which lies below the bottom of conduction band [7]. BiFeO 3 is a p-type semiconductor [33][34][35][36], whose band gap varies from 2.0 to 2.7 eV and its Fermi level lies close to its valance band. Here the band gap of BFO is calculated to be 2.07 eV according to the UV-vis DRS spectra.…”