Office of Naval Research End-of-the-Year Report: Publications/Patents/Presentations/ Honors/Students Report: Chemical Reactivity Studies of High Temperature Superconductor Structures and Devices

摘要

A light surface fluorination technique is exploited to alter the properties ofYBa2Cu3O(7-x) ceramic samples. Unlike previous studies where more aggressive fluorination conditions were employed and reductions in the carrier density as well as the formation of amorphous degradation phases were noted, the mild fluorination conditions reported herein can be utilized to incorporate fluorine directly into the high-Tc lattice without disruption of the basic structure. Consequently, more positive values for the copper and oxygen binding energies than seen in previous experiments by XPS are observed. Moreover, the special fluorination conditions identified here are shown to impart enhanced stability towards the adverse effects of water corrosion. jg.