Abstract
The Li3Sc2−xBx(PO4)3 compounds, with x = 0–2, were synthesized by a solid state reaction and studied by X-rays. The ceramic samples were sintered and studied by digital scanning microscope. The electrical properties of the ceramic (x = 0, 0.5, 1) and glass (x = 2) samples were investigated in a frequency range 10 6 –1.2� 10 9 Hz and in a temperature range 300–600 K. Two regions of relaxational dispersion were found in conductivity spectra of the ceramics. They are related to the fast Li + ion transport in the bulk and in the grain boundaries of the ceramics. Isomorphic substitution Sc→B leads to a change of temperature of the phase transition to -phase (T). The increase of stoichiometric factor x caused the increases of intragrain (�g) and total (�tot) conductivities, and also the decrease of their activation energies in the temperature range below T.
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