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2004
Electric properties
D 8000
Crystal Structure of New Li+ Ion Conducting Perovskites: Li 2xCa0.5-xTaO3 and
0.2[Ca1-ySry]0.4TaO 3. ? The new solid solutions of title are synthesized by solid state
44- 015 Li
reactions of stoichiometric amounts of Li2CO 3, CaCO3, SrCO3, and Ta2O5 (1500 癈,
10 h). The crystal structures of these Li+ ion conducting compounds are characterized
by synchrotron radiation and conventional powder XRD. They crystallize in the space
group Pnma with Z = 4. Substitution of Ca2+ by Sr 2+ enhances the electrical conductivity by nearly one order of magnitude. At 200 癈, bulk dc conductivity values are close
to 2.3�-6 and 1.1�-5 S/cm for Li0.2Ca 0.4TaO 3 and Li 0.2[Ca0.9Sr0.1]0.4TaO 3, respectively.
? (PHAM, Q. N.; CROSNIER-LOPEZ, M.-P.; LE BERRE*, F.; FAUTH, F.;
FOURQUET, J.-L.; Solid State Sci. 6 (2004) 9, 923-929; Lab. Fluorures, Fac. Sci.,
CNRS, Univ. Maine, F-72085 Le Mans, Fr.; Eng.) ? W. Pewestorf
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