Dielectric relaxation and ionic conductivity studies of LiCaPO4

Abstract

The AC conductivity of the LiCaPO 4 compound has been measured in the temperature range 634-755 K and the frequency range 300 Hz-5 MHz. The impedance data were fitted to an equivalent circuit consisting of series combination of grains, grains boundary, and electrode elements. Dielectric data were analyzed using complex electrical modulus M* at various temperatures. The modulus plots are characterized by the presence of two relaxation peaks thermally activated. The activation energies obtained from the analysis of M″ (0.90 eV) and conductivity data (0.94 eV) are very close, revealing an ionic hopping mechanism.

Structural and electrical properties of Cu2Zn(Sn1−xSix)S4 (x=0, x=0.5) materials for photovoltaic applications

“…x indicating that relaxation observed at low frequency is relative to grain response while the other represent grain boundary effects [21,22].…”

Electrical and Vibrational Studies of Na2K2Cu(MoO4)3

“…The first arc existing towards higher frequencies corresponds to the movement of ions across the grain (bulk), which represents intrinsic conduction and gives rise to an intragranular resistance. The second arc, observed at lower-frequency, corresponds to movement of ions through the grain boundaries [24,25]. The electrical behavior of Na 2 K 2 Cu(MoO 4 ) 3 is interpreted through an equivalent electrical circuit formed by two cells arranged in series, constituted by the parallel combination of the following: g ‖ 1 and gb ‖ CPE1 corresponding to the contributions of grains and grains boundaries, respectively.…”

AC conductivity and dielectric behavior of high-temperature form of copper silver phosphate

“…The analysis of electrical relaxation in this system is carried out using the dielectric modulus M* as formulated [44].…”