Thumbnail
Access Restriction
Open

Author Russ, E. ♦ Monnereau, O. ♦ Vacquier, G. ♦ Casalot, A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ BISMUTH OXIDES ♦ HYDRATION ♦ STRONTIUM OXIDES ♦ CALCIUM OXIDES ♦ COPPER OXIDES ♦ SAMPLE PREPARATION ♦ HEAT TREATMENTS ♦ CRYSTAL DEFECTS ♦ CALCIUM HYDROXIDES ♦ CHEMICAL REACTIONS ♦ HEAVY WATER ♦ X-RAY DIFFRACTION ♦ MICROSTRUCTURE
Abstract After observation of the degradation of bismuth cuprate superconductor by moistened air the authors have examined the action of water alone, through different techniques, in order to distinguish the proper role of water and carbon dioxide. In air the degradation of both powders and crystal occurs with the formation of alkaline earth carbonates, followed by that of hydroxides. Under the action of water vapor action, products are developed close to crystal defects and steps. Calcium hydroxide appears first and then strontium hydroxide, which undergoes a further hydration. The role of water seems to be two-fold: a chemical reagent and a physical medium allowing reactions to occur and crystal to grow. As for air action, the resulting compound of bismuth cuprate superconductor degradation is Bi{sub 2}CuO{sub 4}.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 31
Issue Number 6


Open content in new tab

   Open content in new tab