Open AccessStructural studies of apatite-type oxide ion conductors doped with cobalt
Author(s) -
Julian R. Tolchard,
Jonathan E.H. Sansom,
M. Saïful Islam,
Peter R. Slater
Publication year - 2005
Publication title -
dalton transactions
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.98
H-Index - 184
eISSN - 1477-9234
pISSN - 1477-9226
DOI - 10.1039/b418992b
Subject(s) - apatite , lanthanum , cobalt , doping , materials science , extended x ray absorption fine structure , xanes , neutron diffraction , silicate , crystallography , oxide , mineralogy , chemical engineering , inorganic chemistry , crystal structure , chemistry , absorption spectroscopy , metallurgy , optoelectronics , spectroscopy , optics , physics , quantum mechanics , engineering
A series of Co doped lanthanum silicate apatite-type phases, La9.83Si4.5Co1.5O26, La9.66Si5CoO26, La10Si5CoO26.5 and La8BaCoSi6O26, have been synthesised, and neutron diffraction, EXAFS and XANES used to investigate their structures in detail. All compositions were shown to possess the hexagonal apatite structure, and the results confirmed that cobalt can be doped onto both the La and Si sites within the structure depending on the starting composition. The Co doping is shown to cause considerable local distortions within the apatite structure. In the case of Si site doping two compositions showed anisotropic peak broadening, which has been attributed to incommensurate ordering of oxygen within the apatite channels.
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