Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 600, Issue 1, Pages 319-321Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2008.11.081
Keywords
Oxygen-ionic conductor; Oxyapatite; Neutron powder diffraction; Rietveld method; Low temperature
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Funding
- Ministry of Education, Science, Sports and Culture, Japan [19540382]
- Grants-in-Aid for Scientific Research [19540382] Funding Source: KAKEN
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The neutron powder-diffraction data of the apatite-type La-silicate La9.50Si6O26.25, was measured using JAEA-HRPD diffractometer at 10K. The Rietveld refinement on the basis of hexagonal P6(3)/m was successfully carried out with anisotropic thermal displacement parameters for all sites. The obtained cell parameters were a=0.971297(7)nm, and c=0.717950(6)nm. On the Rietveld refinement supported by maximum entropy method, the interstitial oxygen positions show randomly distribution around La2 site, and they may give the driving-force of high ionic conductivity to the main ionic conduction site O4. (C) 2008 Elsevier B.V. All rights reserved.
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