Neutron diffraction and TSDC on Ba1−xUxF2+2x solid electrolytes

M. Ouwerkerk; N. H. Andersen; F. F. Veldkamp; J. Schoonman

doi:10.1016/0167-2738(86)90287-0

Neutron diffraction and TSDC on Ba1−xUxF2+2x solid electrolytes

M. Ouwerkerk, N. H. Andersen, F. F. Veldkamp, J. Schoonman

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Abstract

The defect structure of fluorite-type Ba1−xUxF2+2x solid solutions, which exhibit fast fluoride ion conductivity, has been investigated by quasi-elastic diffuse neutron scattering (QDNS) experiments, and thermally stimulated depolarisation current (TSDC) measurements. A comparison with model calculations reveals (212) clusters to dominate the defect structure. From 10 to 400K TSDS spectra reveal for x <0.05 six relaxation peaks of dipolar nature, along with the relaxation of macroscopic space charge. Conductivity parameters calculated from the latter relaxation compare very well with those obtained from a.c. ionic conductivity studies. The low-temperature relaxation at 29.5 K is ascribed to depolarisation steps of (212) clusters. Evidence for the relaxation of a minor amount of (UBaFi)x dipoles is found. A direct indication of the freedom of orientation of a (212) cluster is obtained from an initial QDNS-study on a polarised crystal.

Original language	English
Journal	Solid State Ionics
Volume	18-19
Issue number	Part 2
Pages (from-to)	916-921
ISSN	0167-2738
DOIs	https://doi.org/10.1016/0167-2738(86)90287-0
Publication status	Published - 1986

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title = "Neutron diffraction and TSDC on Ba1−xUxF2+2x solid electrolytes",

abstract = "The defect structure of fluorite-type Ba1−xUxF2+2x solid solutions, which exhibit fast fluoride ion conductivity, has been investigated by quasi-elastic diffuse neutron scattering (QDNS) experiments, and thermally stimulated depolarisation current (TSDC) measurements. A comparison with model calculations reveals (212) clusters to dominate the defect structure. From 10 to 400K TSDS spectra reveal for x <0.05 six relaxation peaks of dipolar nature, along with the relaxation of macroscopic space charge. Conductivity parameters calculated from the latter relaxation compare very well with those obtained from a.c. ionic conductivity studies. The low-temperature relaxation at 29.5 K is ascribed to depolarisation steps of (212) clusters. Evidence for the relaxation of a minor amount of (UBaFi)x dipoles is found. A direct indication of the freedom of orientation of a (212) cluster is obtained from an initial QDNS-study on a polarised crystal.",

author = "M. Ouwerkerk and Andersen, {N. H.} and Veldkamp, {F. F.} and J. Schoonman",

year = "1986",

doi = "10.1016/0167-2738(86)90287-0",

language = "English",

volume = "18-19",

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journal = "Solid State Ionics",

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TY - JOUR

T1 - Neutron diffraction and TSDC on Ba1−xUxF2+2x solid electrolytes

AU - Ouwerkerk, M.

AU - Andersen, N. H.

AU - Veldkamp, F. F.

AU - Schoonman, J.

PY - 1986

Y1 - 1986

N2 - The defect structure of fluorite-type Ba1−xUxF2+2x solid solutions, which exhibit fast fluoride ion conductivity, has been investigated by quasi-elastic diffuse neutron scattering (QDNS) experiments, and thermally stimulated depolarisation current (TSDC) measurements. A comparison with model calculations reveals (212) clusters to dominate the defect structure. From 10 to 400K TSDS spectra reveal for x <0.05 six relaxation peaks of dipolar nature, along with the relaxation of macroscopic space charge. Conductivity parameters calculated from the latter relaxation compare very well with those obtained from a.c. ionic conductivity studies. The low-temperature relaxation at 29.5 K is ascribed to depolarisation steps of (212) clusters. Evidence for the relaxation of a minor amount of (UBaFi)x dipoles is found. A direct indication of the freedom of orientation of a (212) cluster is obtained from an initial QDNS-study on a polarised crystal.

AB - The defect structure of fluorite-type Ba1−xUxF2+2x solid solutions, which exhibit fast fluoride ion conductivity, has been investigated by quasi-elastic diffuse neutron scattering (QDNS) experiments, and thermally stimulated depolarisation current (TSDC) measurements. A comparison with model calculations reveals (212) clusters to dominate the defect structure. From 10 to 400K TSDS spectra reveal for x <0.05 six relaxation peaks of dipolar nature, along with the relaxation of macroscopic space charge. Conductivity parameters calculated from the latter relaxation compare very well with those obtained from a.c. ionic conductivity studies. The low-temperature relaxation at 29.5 K is ascribed to depolarisation steps of (212) clusters. Evidence for the relaxation of a minor amount of (UBaFi)x dipoles is found. A direct indication of the freedom of orientation of a (212) cluster is obtained from an initial QDNS-study on a polarised crystal.

U2 - 10.1016/0167-2738(86)90287-0

DO - 10.1016/0167-2738(86)90287-0

M3 - Journal article

SN - 0167-2738

VL - 18-19

SP - 916

EP - 921

JO - Solid State Ionics

JF - Solid State Ionics

IS - Part 2

ER -

Neutron diffraction and TSDC on Ba1−xUxF2+2x solid electrolytes

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