Kareem A. Jasim Mohammed A.N. Thejeel Raghad Subhi Al-Khafaji
الملخص الانجليزي
Abstract
The Sr doped La1Ba1-xSrx Ca2Cu4O8.5+ƒآ samples with 0 . x . 0.3 had been prepared using the solid state reaction. The samples were claimed at 800پ‹C for 3hr, palletized and sintered at 860پ‹C for 20hr in air . Dielectric constant and loss by means of capacitance have been investigated with frequencies in the range of 1kHZ to 1MHZ for our samples at room temperature. Also, Shore hardness has been measured. The dielectric constant and loss decrease slightly with the increase of frequency for all compounds. Additionally, the partial substitution of Sr+2 into Ba+2 sites never have effect on the dielectric properties. X-ray diffraction (XRD) analysis showed a tetragonal structure and the as grown La1Ba1-xSrx Ca2Cu4O8.5+ƒآ correspond to the 1124 phase. It was found that the change of the Sr concentrations of all our samples produces a change in a, c and c/a parameters.
ا.د.رغد صبحي عباس الخفاجي | Prof.Dr.Raghad Subhi Abbas Al-Khafaji | 6545