Singh, K. K. ; Morris, D. E. ; Sinha, A. P. B. (1994) Stability of Ba, Sr and Ca cuprate phases as a function of oxygen pressure Physica C: Superconductivity, 231 (3-4). pp. 377-382. ISSN 0921-4534
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Official URL: http://www.sciencedirect.com/science/article/pii/0...
Related URL: http://dx.doi.org/10.1016/0921-4534(94)90648-3
Abstract
Alkaline earth-copper oxide binary mixtures were reacted in elevated oxygen pressure up to 200 bar in the temperature range 880-950° C. The phases which were formed have been identified by X-ray powder diffraction analysis. The compounds which become stabilized at higher P(O2) are Ba2Cu3O5+δ; , Sr2CuO3+δ , (Sr14Cu24) 1-xO41 and Ca4Cu5O10. These compounds have formal copper valence (FCV) in the range of 2.4 to 2.8 and are therefore favored at higher P(O2) over the ABO2 and A2BO3 compounds obtained at 1 bar which have FCV=2. The transition pressures to the more oxidized cuprates are ~10 bar for Ca2CuO3/Ca4Cu5O10, 17.5 bar for BaCuO2/Ba2Cu3O5+δ; and 40 bar for SrCuO2/(Sr14Cu24)1-xO41 at 880-950° C.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 48915 |
| Deposited On: | 19 Jul 2011 07:29 |
| Last Modified: | 19 Jul 2011 07:29 |
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