The kinetic behaviour of the YBa2CU3O7-delta system has been investigated via a 'T-jump' experiment. This is realized by a displacement of the thermodynamic system from equilibrium by a temperature jump. The subsequent relaxation process is followed via resistivity measurements. Kinetic models have been formulated by assuming the formation of singly and doubly charged oxygen vacancies and according to the kinetic law of mass action. A good agreement between the theoretical model and the experimental data has been achieved in the case of singly charged oxygen vacancies in the temperature range 400-800-degrees-C. At equilibrium the YBa2Cu3O7-delta conductivity is found to be a function of the oxygen partial pressure, P, according to sigma is-proportional-to P(n) with 1/4 < n < 1/2.
HETEROGENEOUS EQUILIBRIUM BETWEEN YBA2CU3O7-DELTA AND OXYGEN GAS STUDIED BY A KINETIC APPROACH / F., Cellucci; P. L., Cignini; Gozzi, Daniele; M., Tomellini. - In: JOURNAL OF MATERIALS CHEMISTRY. - ISSN 0959-9428. - STAMPA. - 3:(1993), pp. 421-426. [10.1039/jm9930300421]
HETEROGENEOUS EQUILIBRIUM BETWEEN YBA2CU3O7-DELTA AND OXYGEN GAS STUDIED BY A KINETIC APPROACH
GOZZI, Daniele;
1993
Abstract
The kinetic behaviour of the YBa2CU3O7-delta system has been investigated via a 'T-jump' experiment. This is realized by a displacement of the thermodynamic system from equilibrium by a temperature jump. The subsequent relaxation process is followed via resistivity measurements. Kinetic models have been formulated by assuming the formation of singly and doubly charged oxygen vacancies and according to the kinetic law of mass action. A good agreement between the theoretical model and the experimental data has been achieved in the case of singly charged oxygen vacancies in the temperature range 400-800-degrees-C. At equilibrium the YBa2Cu3O7-delta conductivity is found to be a function of the oxygen partial pressure, P, according to sigma is-proportional-to P(n) with 1/4 < n < 1/2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
