Oxygen transport in epitaxial SrTiO3/SrTi1?xFexO3 multilayer stacks

Michal Schulz; Timna Orland; Alexander Mehlmann; Avner Rothschild; Holger Fritze

doi:10.5194/jsss-6-107-2017

Oxygen transport in epitaxial SrTiO₃/SrTi_1?xFe_xO₃ multilayer stacks

Michal Schulz, Timna Orland, Alexander Mehlmann, Avner Rothschild, Holger Fritze

Technion - Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

Nano-ionic materials made of strontium titanate (SrTiO3, STO) and solid solutions of strontium ferrite in STO (SrTi1 ĝ' xFexO3, STF) are grown on single crystalline STO substrates and characterized. Since STF exhibits an oxygen deficiency and, simultaneously, enables oxygen interstitial defects, a space charge area close to the STOĝ€|ĝ€STF interface is present. Oxygen tracer diffusion experiments and impedance spectroscopy at temperatures from 500 to 700ĝ€°C and at oxygen partial pressure ranging from 10ĝ'3 to 10ĝ'23ĝ€bar confirm fast oxygen transport caused by enhanced ionic conductivity at the interface. There, an oxygen diffusion coefficient of 3. 4 × 10ĝ'10ĝ€m2ĝ€sĝ'1 at 600ĝ€°C and a p type conductivity of about 360ĝ€Sĝ€mĝ'1 at 700ĝ€°C are calculated. Such structures open new options in design of nano-ionic materials for oxygen sensors and energy conversion at temperatures lower than those of conventional materials such as yttrium-doped zirconia.

Original language	English
Pages (from-to)	107-119
Number of pages	13
Journal	Journal of Sensors and Sensor Systems
Volume	6
Issue number	1
DOIs	https://doi.org/10.5194/jsss-6-107-2017
State	Published - 28 Feb 2017

All Science Journal Classification (ASJC) codes

Instrumentation
Electrical and Electronic Engineering

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title = "Oxygen transport in epitaxial SrTiO3/SrTi1?xFexO3 multilayer stacks",

abstract = "Nano-ionic materials made of strontium titanate (SrTiO3, STO) and solid solutions of strontium ferrite in STO (SrTi1 ĝ' xFexO3, STF) are grown on single crystalline STO substrates and characterized. Since STF exhibits an oxygen deficiency and, simultaneously, enables oxygen interstitial defects, a space charge area close to the STOĝ€|ĝ€STF interface is present. Oxygen tracer diffusion experiments and impedance spectroscopy at temperatures from 500 to 700ĝ€°C and at oxygen partial pressure ranging from 10ĝ'3 to 10ĝ'23ĝ€bar confirm fast oxygen transport caused by enhanced ionic conductivity at the interface. There, an oxygen diffusion coefficient of 3. 4 × 10ĝ'10ĝ€m2ĝ€sĝ'1 at 600ĝ€°C and a p type conductivity of about 360ĝ€Sĝ€mĝ'1 at 700ĝ€°C are calculated. Such structures open new options in design of nano-ionic materials for oxygen sensors and energy conversion at temperatures lower than those of conventional materials such as yttrium-doped zirconia.",

author = "Michal Schulz and Timna Orland and Alexander Mehlmann and Avner Rothschild and Holger Fritze",

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T1 - Oxygen transport in epitaxial SrTiO3/SrTi1?xFexO3 multilayer stacks

AU - Schulz, Michal

AU - Orland, Timna

AU - Mehlmann, Alexander

AU - Rothschild, Avner

AU - Fritze, Holger

PY - 2017/2/28

Y1 - 2017/2/28

N2 - Nano-ionic materials made of strontium titanate (SrTiO3, STO) and solid solutions of strontium ferrite in STO (SrTi1 ĝ' xFexO3, STF) are grown on single crystalline STO substrates and characterized. Since STF exhibits an oxygen deficiency and, simultaneously, enables oxygen interstitial defects, a space charge area close to the STOĝ€|ĝ€STF interface is present. Oxygen tracer diffusion experiments and impedance spectroscopy at temperatures from 500 to 700ĝ€°C and at oxygen partial pressure ranging from 10ĝ'3 to 10ĝ'23ĝ€bar confirm fast oxygen transport caused by enhanced ionic conductivity at the interface. There, an oxygen diffusion coefficient of 3. 4 × 10ĝ'10ĝ€m2ĝ€sĝ'1 at 600ĝ€°C and a p type conductivity of about 360ĝ€Sĝ€mĝ'1 at 700ĝ€°C are calculated. Such structures open new options in design of nano-ionic materials for oxygen sensors and energy conversion at temperatures lower than those of conventional materials such as yttrium-doped zirconia.

AB - Nano-ionic materials made of strontium titanate (SrTiO3, STO) and solid solutions of strontium ferrite in STO (SrTi1 ĝ' xFexO3, STF) are grown on single crystalline STO substrates and characterized. Since STF exhibits an oxygen deficiency and, simultaneously, enables oxygen interstitial defects, a space charge area close to the STOĝ€|ĝ€STF interface is present. Oxygen tracer diffusion experiments and impedance spectroscopy at temperatures from 500 to 700ĝ€°C and at oxygen partial pressure ranging from 10ĝ'3 to 10ĝ'23ĝ€bar confirm fast oxygen transport caused by enhanced ionic conductivity at the interface. There, an oxygen diffusion coefficient of 3. 4 × 10ĝ'10ĝ€m2ĝ€sĝ'1 at 600ĝ€°C and a p type conductivity of about 360ĝ€Sĝ€mĝ'1 at 700ĝ€°C are calculated. Such structures open new options in design of nano-ionic materials for oxygen sensors and energy conversion at temperatures lower than those of conventional materials such as yttrium-doped zirconia.

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DO - 10.5194/jsss-6-107-2017

M3 - مقالة

SN - 2194-8771

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JO - Journal of Sensors and Sensor Systems

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Oxygen transport in epitaxial SrTiO₃/SrTi_1?xFe_xO₃ multilayer stacks

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