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Title: Instrument for stable high temperature Seebeck coefficient and resistivity measurements under controlled oxygen partial pressure

Abstract

The transport properties of ceramic materials strongly depend on oxygen activity, which is tuned by changing the partial oxygen pressure (pO2) prior to and during measurement. Within, we describe an instrument for highly stable measurements of Seebeck coefficient and electrical resistivity at temperatures up to 1300 K with controlled oxygen partial pressure. An all platinum construction is used to avoid potential materials instabilities that can cause measurement drift. Two independent heaters are employed to establish a small temperature gradient for Seebeck measurements, while keeping the average temperature constant and avoiding errors associated with pO2-induced drifts in thermocouple readings. Oxygen equilibrium is monitored using both an O2 sensor and the transient behavior of the resistance as a proxy. A pO2 range of 10-25–100 atm can be established with appropriate gas mixtures. Seebeck measurements were calibrated against a high purity platinum wire, Pt/Pt–Rh thermocouple wire, and a Bi2Te3 Seebeck coefficient Standard Reference Material. To demonstrate the utility of this instrument for oxide materials we present measurements as a function of pO2 on a 1 % Nb-doped SrTiO3 single crystal, and show systematic changes in properties consistent with oxygen vacancy defect chemistry. Thus, an approximately 11% increase in power factor over a pO2more » range of 10-19–10-8 atm at 973 K for the donor-doped single crystals is observed.« less

Authors:
 [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1184588
Report Number(s):
SAND-2014-19792J
Journal ID: ISSN 0022-2461; 542913
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Science
Additional Journal Information:
Journal Volume: 50; Journal Issue: 14; Journal ID: ISSN 0022-2461
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Ihlefeld, Jon F., Brown-Shaklee, Harlan James, and Sharma, Peter Anand. Instrument for stable high temperature Seebeck coefficient and resistivity measurements under controlled oxygen partial pressure. United States: N. p., 2015. Web. doi:10.1007/s10853-015-9049-2.
Ihlefeld, Jon F., Brown-Shaklee, Harlan James, & Sharma, Peter Anand. Instrument for stable high temperature Seebeck coefficient and resistivity measurements under controlled oxygen partial pressure. United States. https://doi.org/10.1007/s10853-015-9049-2
Ihlefeld, Jon F., Brown-Shaklee, Harlan James, and Sharma, Peter Anand. Tue . "Instrument for stable high temperature Seebeck coefficient and resistivity measurements under controlled oxygen partial pressure". United States. https://doi.org/10.1007/s10853-015-9049-2. https://www.osti.gov/servlets/purl/1184588.
@article{osti_1184588,
title = {Instrument for stable high temperature Seebeck coefficient and resistivity measurements under controlled oxygen partial pressure},
author = {Ihlefeld, Jon F. and Brown-Shaklee, Harlan James and Sharma, Peter Anand},
abstractNote = {The transport properties of ceramic materials strongly depend on oxygen activity, which is tuned by changing the partial oxygen pressure (pO2) prior to and during measurement. Within, we describe an instrument for highly stable measurements of Seebeck coefficient and electrical resistivity at temperatures up to 1300 K with controlled oxygen partial pressure. An all platinum construction is used to avoid potential materials instabilities that can cause measurement drift. Two independent heaters are employed to establish a small temperature gradient for Seebeck measurements, while keeping the average temperature constant and avoiding errors associated with pO2-induced drifts in thermocouple readings. Oxygen equilibrium is monitored using both an O2 sensor and the transient behavior of the resistance as a proxy. A pO2 range of 10-25–100 atm can be established with appropriate gas mixtures. Seebeck measurements were calibrated against a high purity platinum wire, Pt/Pt–Rh thermocouple wire, and a Bi2Te3 Seebeck coefficient Standard Reference Material. To demonstrate the utility of this instrument for oxide materials we present measurements as a function of pO2 on a 1 % Nb-doped SrTiO3 single crystal, and show systematic changes in properties consistent with oxygen vacancy defect chemistry. Thus, an approximately 11% increase in power factor over a pO2 range of 10-19–10-8 atm at 973 K for the donor-doped single crystals is observed.},
doi = {10.1007/s10853-015-9049-2},
journal = {Journal of Materials Science},
number = 14,
volume = 50,
place = {United States},
year = {Tue Apr 28 00:00:00 EDT 2015},
month = {Tue Apr 28 00:00:00 EDT 2015}
}

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Works referencing / citing this record:

Electrochemical Oxygen Sensor Based on the Interaction of Double-Layer Ionic Liquid Film (DLILF)
journal, January 2018

  • Zhang, Hao; Liu, Jingyuan; Liu, Qi
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