ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
X-ray powder and electron single-crystal diffraction of crystals of Li2TiOSiO4 and Li2TiOGeO4 showed them to be tetragonal, space group P4/nmm unit-cell parameters a = 6.4379\,(2), c = 4.40032\,(2) Å for Li2TiOSiO4 and a = 6.6110\,(8), c = 4.4372\,(6) Å for Li2TiGeO4. The compounds are isostructural with their sodium analogues but are considerably compressed along the c axis owing to the smaller size of lithium compared with sodium atoms. Square-pyramidal TiO5 groups are joined in these compounds by tetrahedral SiO4 and GeO4 groups, respectively. 17O nuclear magnetic resonance spectra of the two compounds, isotopically enriched with 17O, showed peaks due to the apical titanyl, Ti—O, and basal, bridging, Ti—O—Si or Ti—O—Ge, oxygen atoms of the title compounds. By comparison with reference spectra, oxygen K edges and titanium L2,3 edges of electron energy-loss spectra were tentatively assigned.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108767398006990
Permalink