Thumbnail
Access Restriction
Open

Author Gover, R. K. B. ♦ Irvine, J. T. S.
Sponsorship USDOE, Washington, DC (United States)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ PHASE STUDIES ♦ LITHIUM OXIDES ♦ TITANIUM OXIDES ♦ SOLID SOLUTIONS ♦ CHEMICAL COMPOSITION ♦ X-RAY DIFFRACTION ♦ NEUTRON DIFFRACTION ♦ CRYSTAL MODELS ♦ VACANCIES
Abstract The authors report the discovery of a new solid solution linking the LiTi{sub 2}O{sub 4} and Li{sub 2}Ti{sub 3}O{sub 7} ramsdellite phases. The solid solution system is Li{sub 1+x}Ti{sub 2{minus}2x}O{sub 4} (0 {le} x {le} 0.143), where Li{sub 2}Ti{sub 3}O{sub 7} can be written as Li{sub 1.143}Ti{sub 1.714}O{sub 4}. Combined Rietveld refinement of X-ray and neutron diffraction data sets has been used to determine the structure of various members of this solid solution. Unit-cell dimensions were seen to decrease as the Li content increased, in accord with the expected decrease in ionic size of Ti on oxidation. The Li channel and framework occupancy was seen to follow a simple substitutional mechanism; for every two titanium atoms in the framework that are replaced by lithium atoms, one lithium is lost from the channel sites, introducing a channel vacancy site. The lithium temperature factors were seen to increase over a composition range from x = 0 to x = 0.143. This is probably related to the increased number of channel vacancies. No evidence was observed for the splitting of the Li channel sites, even for the x = 0.143 end member.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1998-12-01
Publisher Department Argonne National Laboratory (ANL), Argonne, IL
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 141
Issue Number 2
Organization Argonne National Laboratory (ANL), Argonne, IL


Open content in new tab

   Open content in new tab