Frequency Behaviour of Dielectric Constants of Raw and Reduced Li2B4O7(LTB)

An investigation of the dielectric constant according to the frequency (20 Hz and 1 GHz) for as-grown and reduced samples of lithium tetraborate (LTB) is done. Anisotropy of e' and e at low frequency decreases by reducing crystal then at frequency higher the 104 Hz the reduced state does not affect e. The disappearance of relaxations in both real and imaginary part of e x in as-grown LTB, shows the unidirectional conductivity of the lithium ions along the 'Z' axis. When the samples are reduced we notice the appearance of relieving in the imaginary and real parts of e x and an increase in these relaxations for the two components of e z , that shows the appearance of a new mechanism of conduction in two directions X and Z other than that of lithium.