Electrical conductivity and permittivity of the one-dimensional superionic conductor LiCuVO4

Superionic Conductivity and Specific Effects Induced by γ-Radiation in Nanofibrous TlGaTe2 Crystals

“…It can be seen from the insert in Fig. 1a that the experimental points of the ln(σT) dependence fit well the straight line described, in the case of ionic conductivity, by the formula (Lidyard, 1957;Parfen'eva et al, 2004),…”

“…As it is known (Lidyard, 1957;Parfen'eva et al, 2004), in superionic conductors with increasing temperature, in addition to exponential growth of electrical conductivity, the exponential growth of permittivity ε is observed, which can attain rather large values at high temperatures.…”

Phase Transition in TlS, TlSe and TlInS2 Crystals Caused by Nanoscale Defects

“…2, 3 and 4, for all crystals, the experimental points of the temperature dependence ln(σ·T) in the range of the sharp jump of conductivity are described well by a straight line, which is given by the following equation: (1) where  is the conductivity of sample, 0 is the constant within the experimental interval of temperature, ΔE is the conductivity activation energy, T is the temperature in Kelvins and k is the Boltzmann constant. It is known that this temperature dependence of conductivity indicates the dominant character of ionic conductivity above the critical temperature [2][3][4][5]. The values of critical temperatures and activation energies for TlS, TlSe, and TlInS2 crystals are shown in Table 1.…”

“…The resulting monoclinic lattice is characterized by group symmetry. Significant attention has been paid to such crystallographic systems, that behave as if they have less than three spatial dimensions [1]- [5], [9], [10]. Such materials are often called quasi-two-dimensional (2D) layers.…”

“…These conditions are satisfied for only a few crystals, the structure of which excludes long-range ordering in the spatial arrangement of one or several types of atoms but retains long-range order for other particles. These compounds are considered crystals with intrinsic structural disordering [2]- [5]. Crystals with structural disordering, which have mainly ion conductivity, can be in two qualitatively different (dielectric and superionic) states.…”