تهمینه جلالی

Superconductivity is a phenomenon that occurs at low temperatures, and materials lose their electrical resistance at transition temperatures, and the properties of superconductivity depend heavily on the way they are made. In this thesis, a solid-state method is used to study the production of calcium carbonate nanoparticles and nano-superconductors YCa_2 Cu_3 O_ (7-?) and the method of solid state. In this composition, natural calcium carbonate nanoparticles have been used, which is from the coastal squid bone The Persian Gulf has been collected and made through the ball milling. The thesis also explores the entry of nanoparticles, as well as the way of milling, and changes in sample dimensions. This combination of nanosuperconductor was investigated due to the availability of primary materials, non toxicity and according to the facilities of the laboratory. To construct this nanosuperconductor compound, a calcium carbonate nanoparticle was first made and then the superconducting steps were made, which included: weighing the primary materials Precision stoichiometry, blending and milling of powders, scraping, milling, powder presses and making pills and scouring under oxygen gas flow have been addressed. The study of the effect of milling hours on structural properties such as particle size, strain, network parameter, volume fraction of grain boundary, as well as particle distribution and shape are among the issues that are specifically addressed in this thesis. A total of 9 combinations are made up of 8 combinations of YCa_2 Cu_3 O_ (7-?) and a combination of YCa_2 Cu_3 O_ (7-?) superconducting Bulk compositions. The transition temperature of the samples is 92 degrees Kelvin and the highest oxygen content obtained is 6.8971 which is related to It is a mix that has been grinded for hours.