Electrochemical investigations of SrTiO{sub 3} boundaries

Denk, I; Claus, J; Maier, J

doi:10.1149/1.1838044

Title: Electrochemical investigations of SrTiO{sub 3} boundaries

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Abstract

Interfaces (grain boundaries and surfaces) are studied in acceptor (Fe) doped SrTiO{sub 3} bicrystals, single crystals, and ceramics as a function of temperature (423 K {le} T {le} 1,023 K), oxygen partial pressure (1 Pa {le} p{sub o{sub 2}} {le} 10{sup 5} Pa), and Fe doping content (1.9 {times} 10{sup 18} cm{sup {minus}3} {le} c{sub F{sub e}} {le} 9.5 {times} 10{sup 19} cm{sup {minus}3}) using electrochemical methods. In particular, impedance spectroscopy and dc polarization techniques have been applied. The electrochemical investigation of tilt and twist grain boundaries in bicrystals combined with structural and chemical grain boundary characterization by transmission electron microscopy, electron diffraction x-ray analysis, and electron energy loss spectroscopy allowed the authors to clarify grain boundary effects in SrTiO{sub 3}. The use of reversible (nonblocking) YBa{sub 2}Cu{sub 3}O{sub 6{minus}x} electrodes proves to be a convenient technique to measure conductivities without electrode effects, since blocking effects at the sample surface were minimized. These results have been compared with those obtained for grain boundaries in polycrystalline samples as well as with the interface between metallic electrodes and SrTiO{sub 3} single crystals. Besides individual features, all findings at the investigated boundaries and interfaces could be consistently explained by the appearance of pronouncedmore »« less

Authors:

Denk, I; Claus, J; Maier, J ^[1]

Max-Planck-Inst. fuer Festkoerperforschung, Stuttgart (Germany)

Publication Date:: Wed Oct 01 00:00:00 EDT 1997

Sponsoring Org.:: USDOE

OSTI Identifier:: 562214

Resource Type:: Journal Article

Journal Name:: Journal of the Electrochemical Society

Additional Journal Information:: Journal Volume: 144; Journal Issue: 10; Other Information: PBD: Oct 1997

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; STRONTIUM OXIDES; TITANIUM OXIDES; ELECTRIC CONDUCTIVITY; INTERFACES; GRAIN BOUNDARIES

Citation Formats


                    Denk, I, Claus, J, and Maier, J. Electrochemical investigations of SrTiO{sub 3} boundaries.  United States: N. p., 1997. 
        Web.  doi:10.1149/1.1838044.

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                    Denk, I, Claus, J, & Maier, J. Electrochemical investigations of SrTiO{sub 3} boundaries.  United States.  https://doi.org/10.1149/1.1838044

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                    Denk, I, Claus, J, and Maier, J. 1997.  
        "Electrochemical investigations of SrTiO{sub 3} boundaries".  United States.  https://doi.org/10.1149/1.1838044.

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@article{osti_562214,

  title        = {Electrochemical investigations of SrTiO{sub 3} boundaries},

  author       = {Denk, I and Claus, J and Maier, J},

  abstractNote = {Interfaces (grain boundaries and surfaces) are studied in acceptor (Fe) doped SrTiO{sub 3} bicrystals, single crystals, and ceramics as a function of temperature (423 K {le} T {le} 1,023 K), oxygen partial pressure (1 Pa {le} p{sub o{sub 2}} {le} 10{sup 5} Pa), and Fe doping content (1.9 {times} 10{sup 18} cm{sup {minus}3} {le} c{sub F{sub e}} {le} 9.5 {times} 10{sup 19} cm{sup {minus}3}) using electrochemical methods. In particular, impedance spectroscopy and dc polarization techniques have been applied. The electrochemical investigation of tilt and twist grain boundaries in bicrystals combined with structural and chemical grain boundary characterization by transmission electron microscopy, electron diffraction x-ray analysis, and electron energy loss spectroscopy allowed the authors to clarify grain boundary effects in SrTiO{sub 3}. The use of reversible (nonblocking) YBa{sub 2}Cu{sub 3}O{sub 6{minus}x} electrodes proves to be a convenient technique to measure conductivities without electrode effects, since blocking effects at the sample surface were minimized. These results have been compared with those obtained for grain boundaries in polycrystalline samples as well as with the interface between metallic electrodes and SrTiO{sub 3} single crystals. Besides individual features, all findings at the investigated boundaries and interfaces could be consistently explained by the appearance of pronounced Schottky barriers which were composed of depletion layers of mobile majority charge carriers.},

  doi          = {10.1149/1.1838044},

  url          = {https://www.osti.gov/biblio/562214},
  journal      = {Journal of the Electrochemical Society},
number       = 10,

  volume       = 144,

  place        = {United States},

  year         = {Wed Oct 01 00:00:00 EDT 1997},

  month        = {Wed Oct 01 00:00:00 EDT 1997}

}

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