Growth and various characterizations of LiHSO₄ single crystals

In the present work, we have grown the single crystals of lithium hydrogen sulfate (LiHSO₄) by slow evaporation technique. These grown crystals were characterized by various techniques. For structural analysis powder X-ray diffraction has been used and these crystals were found to have monoclinic crystal structure. Fourier transform infrared spectroscopy was used to find various affiliated functional groups present in the system. Optical properties were studied by using UV–visible spectroscopy. Present system shows an indirect allowed transition with an optical band gap of around 5.36 eV. The dielectric constant and dielectric loss show a well dispersion with frequency. AC conductivity of the present crystals is controlled by the correlated barrier hopping model. Possible evidence for bipolaron hopping mechanism was also explored. From thermal study, a phase transition is shown at around 389 K. Various thermodynamic parameters ΔH, ΔS and ΔC_p are also calculated. We observed a strong inter-relation between various parameters of the system.