Reflection spectra and the parameters of dispersion oscillators of the pero
vskites La2/3-xM3xTiO3, where M is Li, Na, K are presented in the paper. In
the case when M is Li the above perovskites exhibit high lithium ion condu
ctivity. The origins of the lithium ion conductivity in the materials of th
e system La2/3-xLi3xTiO3 are discussed on the grounds is of both the resear
ch data obtained and the reference data. (C) 2001 Elsevier Science Ltd. All
rights reserved.