Accession Number : ADA294749

Title :   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.

Descriptive Note : Annual rept. no. 1,

Corporate Author : TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY AND BIOCHEMISTRY

Personal Author(s) : McDevitt, John T.

PDF Url : ADA294749

Report Date : 31 MAY 1995

Pagination or Media Count : 31

Abstract : A light surface fluorination technique is exploited to alter the properties of YBa2Cu3O(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

Descriptors :   *LIGHT, *SURFACES, *CHEMICAL REACTIONS, *HIGH TEMPERATURE SUPERCONDUCTORS, *FLUORINATION, *YTTRIUM, DENSITY, CORROSION, DEGRADATION, WATER, STRUCTURES, REACTIVITIES, AMORPHOUS MATERIALS, PHASE, OXYGEN, CERAMIC MATERIALS, CHEMISTRY, NUCLEAR BINDING ENERGY, OXIDES, X RAY PHOTOELECTRON SPECTROSCOPY, COPPER, ADVERSE CONDITIONS, LATTICE DYNAMICS, BARIUM, PATENTS.

Subject Categories : Electricity and Magnetism
      Inorganic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE