Crystallization of new cuprates and bismuthates from molten hydroxides and nitrates
- Univ. of California, Berkeley, CA (United States)
Fused hydroxides and nitrates are excellent solvents for the preparation of new cuprates and bismuthates at temperatures as low as 250{degrees}C. Among the many advantages of using these fluxes are selective precipitation of the products at relatively low temperatures, simplicity in the formation of solid oxide materials, and growth of single crystals. Specifically, for molten hydroxides, the metal oxide reactants are soluble when the concentration of water is high, and the oxide product can be precipitated selectively by removing water. For molten nitrates, metal nitrite reactants are soluble, and the oxide product is precipitated by addition of alkali metal hydroxide. The authors have crystallized dozens of new cuprates and bismuthates by varying the solution conditions, such as concentrations of reactants, acidity, and temperature, and by varying the atmosphere over the melt. The materials that are obtained are highly oxidized; some contain only Cu(III) and Bi(V). Additionally, several are new examples of high temperature superconductors containing alkali metal ions as dopants. An overview of the structures and properties of the new materials that have been crystallized will be presented, with particular emphasis on correlating structure with synthesis conditions.
- OSTI ID:
- 141038
- Report Number(s):
- CONF-930304-; TRN: 93:003688-0711
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
- Country of Publication:
- United States
- Language:
- English
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