Abstract
The desorption kinetics of the chain oxygen atoms in the YBa2Cu3O7−δ (YBCO) superconductor were studied using isothermal vacuum annealing (VA). The number of the O(1) atoms per unit cell in the crystal was measured at three temperatures of 390, 415, and 450°C for various annealing times. From these measurements it was found that at high temperatures the loss of the O(1) atoms from the YBCO is very rapid, and so, low annealing temperatures must be used in order to see the fine details of the desorption phenomena. When the log of the instantaneous O(1) occupancy vs. time was plotted, three distinct linear segments were obtained for each temperature. This, I think is an indication of the existence of multiple desorption processes. From the slopes of these lines, I have evaluated three free energies of activation to be 1.14(6), 1.45(3), and 1.91(13) eV. These results are explained in terms of oxygen ordering in the chains.
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Jorgensen, J.D., Beno, M.A., Hinks, D.G., Soderholm, L., Volin, K.J., Hitterman, R.L., Grace, J.D., Schuller, I.K., Segre, C.U., Zhang, K., Kleefisch, M.S.: Phys. Rev. B36, 3608 (1987)
Farneth, W.E., Bordia, R.K., McCarron-III, E.M., Crawford, M.K., Flippen, R.B.: Solid State Commun.66(9), 953 (1988)
Tarascon, J.M., McKinnon, W.R., Greene, L.H., Hull, G.W., Vogel, E.M.: Phys. Rev. B36, 226 (1987)
Cava, R.J., Batlogg, B., Rabe, K.M., Rietman, E.A., Gallagher, P.K., Rupp Jr., L.W.: Physica C156, 523 (1988);
Cava, R.J.: Science247, 656 (1990);
Cava, R.J., Hewat, A.W., Hewat, E.A., Batlogg, B., Marezio, M., Rabe, K.M., Krajewski, J.J., Peck Jr., W.F., Rupp Jr., L.W.: Physica C165, 419 (1990)
Jorgensen, J.D., Veal, B.W., Paulikas, A.P., Nowicki, L.J., Crabtree, G.W., Claus, H., Kwok, W.K.: Phys. Rev. B41, 1863 (1990)
Nobili, C., Ottaviani, G., Rossi, M.C.: Physica C168, 549 (1990)
LaGraff, J.R., Han, P.D., Payne, D.A.: Phys. Rev. B43, 441 (1991)
Strauven, H., Locquet, J.P., Verbeke, O.B., Bruynseraede, Y.: Solid State Commun.65, 293 (1988)
Locquet, J.P., Strauven, H., Wuyts, B., Verbeke, O.B., Zhang, K., Schuller, I.K., Vanacken, J., Van Haesendouck, C., Bruynseraede, Y.: Physica C153-155, 822 (1988)
Yeh, N.C., Tu, K.N., Park, S.I., Tsuei, C.C.: Phys. Rev. B38, 7087 (1988)
Xie, X.M., Chen, T.G., Wu, Z.L.: Phys. Rev. B40, 4549 (1989)
Tu, K.N., Yeh, N.C., Park, S.I., Tsuei, C.C.: Phys. Rev. B39, 304 (1989)
Tu, K.N., Tsuei, C.C., Park, S.I., Levi, A.: Phys. Rev. B39, 772 (1988)
Oguz, S., Paesler, M.A.: Phys. Rev. B22, 6213 (1980)
LaGraff, J.R., Payne, D.A.: Phys. Rev. B47, 3380 (1993-II)
Elschner, S., Becker, W., Bestgen, H., Brand, M.: Physica C202, 401 (1992)