Studies on molar volume, dielectric properties and refractive indices of Cyanex 923 + benzene/xylene at 300 K

The dielectric dispersion spectra of morpholine with methanol and ethanol binary mixtures have been studied by using Time Domain Reflectometry. Frequency dependent variations of specified mole frac...

Metaphor of molecular dynamics and dielectric dispersion of morpholine with aprotic solvents

The synthesized Schiff base ligand 8-hydroxyquinoline-7-formylidene-4-amino-1-phenyl-2,3-dimethylpyrazolin-5-one (SQL) and its Cu(II), VO(IV) and UO2(II) complexes are characterized by various physicochemical techniques. The thermal properties, dielectric properties, alternating current conductivity (σ
 ac) and conduction mechanism of SQL and its complexes (1–6) are investigated in the frequency range of 0.1–100 kHz and temperature range 298–583 K. The temperature and frequency dependence of the real and the imaginary part of the dielectric constant are studied. The values of the thermal activation energy of conduction mechanism for SQL and its complexes under investigation are calculated at different test frequencies, and found to be in the range 0.0023–0.0798 eV for ΔE
 1 and 0.0897–1.296 eV for ΔE
 2. The ac conductivity, σ
 ac, is related to the frequency as σ
 ac α ω
 S
 where the behavior of the exponent S with temperature determines the operating conduction mechanism. The correlated barrier hopping model is found to be the dominant conduction mechanism for SQL and its complexes (1) and (3–5), and the values of the maximum barrier height (W
 m) are calculated for SQL and its complexes (1) and (3–5). The quantum–mechanical tunneling is the dominant conduction mechanism for complexes (2) and (6).

A. Satya Kumar

Papers

Dielectric and excess dielectric constants in non polar+polar binary liquid mixtures of toluene with alcohols at 303, 313 and 323K