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Title: AGES: Automated Gas Environment System for in situ neutron powder diffraction

Abstract

High fluxes available at modern neutron and synchrotron sources have opened up a wide variety of in situ and operando studies of real processes using scattering techniques. This has allowed the user community to follow chemistry in the beam, which often requires high temperatures, gas flow, etc. In this paper, we describe an integrated gas handling system for the general-purpose powder diffraction beamline Powgen at the Spallation Neutron Source. The Automated Gas Environment System (AGES) allows control of both gas flow and temperature (room temperature to 850 °C), while measuring the partial pressure of oxygen and following the effluent gas by mass spectrometry, concurrent with neutron powder diffraction, in order to follow the structural evolution of materials under these conditions. The versatility of AGES is illustrated by two examples of experiments conducted with the system. In solid oxide fuel cell electrode materials, oxygen transport pathways in double perovskites PrBaCo 2O 5+δ and NdBaCo 2O 5+δ were elucidated by neutron diffraction measurements under atmosphere with oxygen partial pressures (pO 2) of 10 –1 to 10 –4 (achieved using mixtures of nitrogen and oxygen) and temperatures from 575 to 850 °C. In another example, the potential oxygen storage material La 1–xSr xFeOmore » 3 was measured under alternating flows of 15% CH 4 in N 2 and air (20% O 2 in N 2) at temperatures from 135 to 835 °C. As a result, from the oxygen stoichiometry, the optimal composition for oxygen storage was determined.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1493150
Alternate Identifier(s):
OSTI ID: 1471796
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Kirkham, Melanie J., Heroux, Luke, Ruiz-Rodriguez, Mariano, and Huq, Ashfia. AGES: Automated Gas Environment System for in situ neutron powder diffraction. United States: N. p., 2018. Web. doi:10.1063/1.5031432.
Kirkham, Melanie J., Heroux, Luke, Ruiz-Rodriguez, Mariano, & Huq, Ashfia. AGES: Automated Gas Environment System for in situ neutron powder diffraction. United States. doi:10.1063/1.5031432.
Kirkham, Melanie J., Heroux, Luke, Ruiz-Rodriguez, Mariano, and Huq, Ashfia. Fri . "AGES: Automated Gas Environment System for in situ neutron powder diffraction". United States. doi:10.1063/1.5031432. https://www.osti.gov/servlets/purl/1493150.
@article{osti_1493150,
title = {AGES: Automated Gas Environment System for in situ neutron powder diffraction},
author = {Kirkham, Melanie J. and Heroux, Luke and Ruiz-Rodriguez, Mariano and Huq, Ashfia},
abstractNote = {High fluxes available at modern neutron and synchrotron sources have opened up a wide variety of in situ and operando studies of real processes using scattering techniques. This has allowed the user community to follow chemistry in the beam, which often requires high temperatures, gas flow, etc. In this paper, we describe an integrated gas handling system for the general-purpose powder diffraction beamline Powgen at the Spallation Neutron Source. The Automated Gas Environment System (AGES) allows control of both gas flow and temperature (room temperature to 850 °C), while measuring the partial pressure of oxygen and following the effluent gas by mass spectrometry, concurrent with neutron powder diffraction, in order to follow the structural evolution of materials under these conditions. The versatility of AGES is illustrated by two examples of experiments conducted with the system. In solid oxide fuel cell electrode materials, oxygen transport pathways in double perovskites PrBaCo2O5+δ and NdBaCo2O5+δ were elucidated by neutron diffraction measurements under atmosphere with oxygen partial pressures (pO2) of 10–1 to 10–4 (achieved using mixtures of nitrogen and oxygen) and temperatures from 575 to 850 °C. In another example, the potential oxygen storage material La1–xSrxFeO3 was measured under alternating flows of 15% CH4 in N2 and air (20% O2 in N2) at temperatures from 135 to 835 °C. As a result, from the oxygen stoichiometry, the optimal composition for oxygen storage was determined.},
doi = {10.1063/1.5031432},
journal = {Review of Scientific Instruments},
number = 9,
volume = 89,
place = {United States},
year = {2018},
month = {9}
}

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