A proposed semi-empirical energy-relation model between radiation attenuation parameters and thermochemical reaction efficiency in YBCO superconductors

In this thesis, the relationship between radiation attenuation parameters and thermochemical reaction efficiency in YBCO superconductors is examined within a semi-empirical energy-relation framework. The main focus is on the Y123 and Y358 phases. No new experimental synthesis or measurement is claimed; instead, previously published structural, thermochemical, stoichiometric and radiation attenuation datasets are reorganized and interpreted through a data-based modelling approach. The Energy-Reaction Index (ERI) values derived from differential thermal analysis data are 1.84 for Y123 and 1.29 for Y358, indicating a higher thermochemical reaction efficiency for Y123. The main physical revision of the model is the separation of the mass attenuation response from the macroscopic shielding response. The mass attenuation ratio represents a density-independent energy-composition channel, whereas the linear attenuation ratio represents the bulk-density-corrected macroscopic response. The intrinsic quality factor is normalized by the reference value in order to preserve the reference boundary condition. The low-energy attenuation advantage of Y358 is discussed on the basis of experimental data and real-sample effects rather than as an unqualified theoretical superiority. Ho-substituted Y358 data are used as a complementary test case supporting the two-channel interpretation. Overall, this thesis presents a physically separated and calibratable semi-empirical framework for linking synthesis, thermochemistry, structure and radiation response in YBCO superconductors.