Investigation of the hydrogen uptake of doped SrCeO3 by TEM, thermogravimetry and cold neutron prompt gamma activation analysis (CNPGAA)

Krug, F.; Schober, T.; Paul, Rick L.; Springer, T.

doi:10.1016/0167-2738(94)00267-v

Cited by 28 publications

(9 citation statements)

References 2 publications

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“…That the dissolution of water into the bulk must be low is supported by the observation that the unit cell dimensions of proton-conducting perovskites, within experimental error, are the same in the dry and wet states. 31,36 Given the typical weight gain that polycrystalline samples undergo, however, it is impossible for the grain boundaries to account for the entirety of the H 2 O uptake. 4 A high activation energy in the grain boundary region may be understood if one presumes, as has been recently proposed, 37 that O-Ce-O bending vibrations are an essential step for the proton transport mechanism.…”

Section: Discussionmentioning

confidence: 99%

The role of microstructure and processing on the proton conducting properties of gadolinium-doped barium cerate

1998

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The influence of grain boundary conductivity and microstructure on the electrical properties of BaCe 0.85 Gd 0.15 O 32d have been examined. Grain sizes were varied by sintering at various temperatures. Impedance data were analyzed using the brick layer model, and some new consequences of this model are presented. The specific grain boundary conductivity exhibits an activation energy of ϳ0.7 eV, and for similar processing routes, is independent of grain size. An isotope effect was observed, indicating that protons (or deuterons) are the mobile species. TEM investigations showed the intergranular regions to be free of any glassy phase that could account for the differences in bulk and grain boundary properties. Single-crystal fibers, grown by a modified float zone process, were notably barium deficient, and exhibited a low conductivity, comparable to that of polycrystalline Ba 0.96 Ce 0.85 Gd 0.15 O 32d .

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Section: Discussionmentioning

confidence: 99%

The role of microstructure and processing on the proton conducting properties of gadolinium-doped barium cerate

1998

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“…One may measure the weight of a sample in a certain atmosphere versus temperature (isobars A technique used occasionally -providing one has the facility at hand -is cold neutron prompt gamma analysis which gives a measure of hydrogen nuclei in the sample [26]. In secondary ion mass spectrometry (SIMS) we may measure the compositionboth chemical and isotopic distributions -of a material by sputtering the surface by an ion beam and analyzing the secondary ionized species with a mass spectrometer.…”

Section: Various Procedures Are In Usementioning

confidence: 99%

Dense Ceramic Membranes for Hydrogen Separation

Norby

Haugsrud

2007

Membranes for Energy Conversion

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“…Since hydrogen has a very large incoherent neutron scattering cross-section, a small amount of H contaminant can lead to measurement problems in neutron scattering studies. Consequently, hydrogen and other elemental concentration measurements by PGAA are regularly performed to complement neutron scattering at the NCNR [ 125 , 126 , 127 ].…”

Section: Compositional Analysis Of Materials By Nuclear Methodsmentioning

confidence: 99%

Materials research with neutrons at NIST

Rl¹,

Cj²,

Krueger³

et al. 2001

J. Res. Natl. Inst. Stand. Technol.

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The NIST Materials Science and Engineering Laboratory works with industry, standards bodies, universities, and other government laboratories to improve the nation’s measurements and standards infrastructure for materials. An increasingly important component of this effort is carried out at the NIST Center for Neutron Research (NCNR), at present the most productive center of its kind in the United States. This article gives a brief historical account of the growth and activities of the Center with examples of its work in major materials research areas and describes the key role the Center can expect to play in future developments.

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Investigation of the hydrogen uptake of doped SrCeO3 by TEM, thermogravimetry and cold neutron prompt gamma activation analysis (CNPGAA)

Cited by 28 publications

References 2 publications

The role of microstructure and processing on the proton conducting properties of gadolinium-doped barium cerate

The role of microstructure and processing on the proton conducting properties of gadolinium-doped barium cerate

Dense Ceramic Membranes for Hydrogen Separation

Materials research with neutrons at NIST

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