Study of the structural, electrical, thermal and dielectric properties of HgBa2Ca2Cu3O8+δ superconducting

• Main Authors: Ali, Fouad Waheed, Jasim, Kareem Ali
• Format: Conference Proceeding
• Language: English
• Subjects: Critical temperature; Crystal lattices; Crystal structure; Dielectric properties; Electrical resistivity; Heat conductivity; Heat transfer; Lattice parameters; Mathematical analysis; Mercury barium calcium copper oxide; Oxygen; Oxygen content; Room temperature; Thermal conductivity; Thermodynamic properties; Titration; Transition temperature
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0172302

In order to analyze the structural properties of the HgBa2Ca2Cu3O8+δ sample, X-ray diffraction was used. To determine the type of crystal structure, the results showed that the compound has a tetragonal crystal structure. The crystal lattice constants (a, b, c) were calculated with obvious differences in the crystal lattice properties. The crystal size was calculated by four different methods (Scherrer, Williamson-Hall, Halder-Wagner and size-strain plot), which showed the best result using the (Halder-Wagner) method, where the crystal size (C.S=22.27 nm) and determination coefficient (R=0.9903), which is the best method among the four methods for preparing this compound. The titration method of the samples (HgBa2Ca2Cu3O8+δ) was used to find out the percentages of oxygen content (δ) and it was found that the oxygen content was (δ=0.269). And by using the four probes method to determine the transition temperature, it was found that the transition temperature (Tconset) is equal to (147K), where the electrical resistance begins with a strong gradient and becomes zero at the critical temperature (Tcoffset = 128K). The thermal properties were studied using the(Lee's disk) method, the results showed that the thermal conductivity of the sample decreases whenever the temperature is applied to it, as the compound is characterized by a thermal curve that begins to show thermal conductivity at (0.12945) at temperature (313K) and the curve decreases to (0.09888) at temperature (553K). The dielectric properties of the compound were examined using a device (LCR counter) which included: dielectric constant (real and imaginary), loss factor and alternating electrical conductivity, the dielectric properties were studied as a function of frequency and range (50 Hz) to (1 MHz) at room temperature.