Investigation of the LiCu2O2 Phase Samples Treated under High Thermobaric Conditions

Orthorhombic lithium cuprate LiCu 2 O 2 was exposed to high temperature and pressure of 950°C and 4.5 GPa. X-ray diffraction studies indicate that the treated samples of LiCu 2 O 2 had tetragonal symmetry, in contrast to the orthorhombic one of the phase synthesized at atmospheric pressure. Temperature dependences of dielectric permittivity ε and tangent of dielectric loss tanδ, as well as DC (direct current), resistivity, ρ were investigated in the temperature range 77–296 K. No anomalous changes of the studied parameters inherent in the phase transitions were detected in this temperature range. The ρ( T ) dependences were common to semiconductors. These dependences were linearized in the Mott coordinates logρ–1/ T 0.25 . It indicated the variable length hopping mechanism of conduction between the next nearest neighbors in the studied samples.