| Abstrakt: |
Many phenomena in electronics, optics, solid-state physics, and cell biology are explained by dielectrics. Despite the name insulator, polarizable materials are typically referred to as dielectrics, as they have low electrical conduction. However, with temperature and suitable dopant, such materials can enhance their conduction. Single crystals of pure and L-Leucine (1 mol% and 2 mol%) doped potassium dihydrogen phosphate (KDP) crystals were grown from aqueous solutions at room temperature. Paper chromatography indicated the existence of the dopant in the crystals. L-Leucine, for instance, has aliphatic side chains which assume a zwitterionic state at neutral pH. The crystals were subjected to impedance spectroscopy to study their dielectric behaviour and conduction mechanism in the temperature range of 323–373 K and the frequency range of 100 Hz to 1 MHz. For both pure and L-Leucine doped KDP crystals, electrical parameters such as dielectric constant, dielectric loss, complex impedance modulus, alternating current (a.c.), and direct current (d.c.) conductivities have been measured as functions of frequency, temperature, and doping. The conductivity of the crystals changes with temperature suggesting it to be a thermally induced process. [ABSTRACT FROM AUTHOR] |
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