Structural, Electrical and FT-IR studies of nanoZn_(1-X) Ca_XO by Solid State Reaction method

摘要

Single phase polycrystalline Zn_(1-X) Ca_XO with x = 0, 0.01 and 0.02 were synthesized by conventional solid state reaction method. The X-ray diffraction shows that the ceramic samples has hexagonal Wurtzite structure with a space group of p63mc and average crystallite size in the range 52 - 88 nm. The dielectric and electrical properties were studied within the temperature range 30°Cto 500°Cunder air atmosphere as function of frequency (10 kHz). The electrical properties of grain interior and grain boundary have been studied by using the impedance spectroscopy and follow the non-Debye relaxation process. It was observed that the AC conductivity of ceramic samples following the Universal power law S ac s (w) = Aw within the frequency range 1kHz to 1 MHz. The activation energy of Pure ZnO is 0.29 eV was calculated by using the Arrhenius-relation with in temperature range 300 - 500°C, which is increased to (0.40 eV ) when x = 0.02 of Zn_(1-X) Ca_XOat 10 kHz. The peaks attributed at 1415 cm~(-1) ( x = 0.01 ) and 1413 cm~(-1) ( x = 0.02 ) in FT-IR measurement of Zn_(1-X) Ca_XOare due to Ca-O stretching from the calcite phase of CaCO_3, which is not observed in Pure ZnO confirms the presence of Ca in ZnO lattice.