High pressure-high temperature synthesis of distorted perovskite-type Cu-based oxides |
| |
| Authors: | E. F. Skelton A. W. Webb S. B. Qadri E. R. Carpenter M. S. Osofsky R. J. Soulen |
| |
| Affiliation: | Naval Research Laboratory , Washington , D. C. , 20375-5000 , U.S.A. |
| |
| Abstract: | Abstract We have synthesized the rhombohedrally distorted perovskite phase of LaCuO3 by reacting mixtures of La2O3 and CuO in an oxygen rich atmosphere at 1500°C and 6.5 GPa. We find this phase to be metastable; at 410°C and ambient pressure, it undergoes an irreversible transition to a tetragonal structure. By selective replacement of some or all of the La or Cu with one or more of the following elements: Ba, Ca, Cr, Ni, Pb, Sc, Sr, Ti, Y, Zn, and Zr, over 150 different alloys have been formed. Magnetic susceptibility measurements have failed to reveal the presence of superconductivity in any of these new polymorphs. |
| |
| Keywords: | High pressure synthesis superconductors Cu-oxides |
|
|
