Oxygen diffusion and isotope exchange behaviour of NdBa2Cu3O7-x

被引：22

作者：

Kemnitz, E

Galkin, AA

Olesch, T

Scheurell, S

Mozhaev, AP

Mazo, GN

机构：

[1] MOSCOW MV LOMONOSOV STATE UNIV,DEPT INORGAN CHEM,MOSCOW 119899,RUSSIA

[2] AERES ANGEW UMWELTFORSCH GMBH,D-12484 BERLIN,GERMANY

来源：

JOURNAL OF THERMAL ANALYSIS | 1997年 / 48卷 / 05期

关键词：

diffusion; isotope exchange; mechanism; neodym barium cuprate;

D O I：

10.1007/BF01979149

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The oxygen diffusion and exchange behaviour of NdBa2Cu3O7-x is investigated by means of isothermal and dynamic-thermal analytical techniques. From the results it is concluded that oxygen anions move along vacancies in the CuO2-layers of the perovskite-like structure. In temperature regions where the diffusion rate is low (665 K < T < 773 K) heterogeneous oxygen exchange reactions take place on the phase boundary. The higher the exchange rate the more the partially heterogeneous exchange is favoured in comparison to the completely heterogeneous isotope exchange. Depending on the oxygen deficiency of NdBa2Cu3O7-x the out-diffusion of oxygen becomes dominating at higher temperatures.

引用

页码：997 / 1010

页数：14

共 16 条

[1] OXYGEN DIFFUSION IN YBA2CU3O7-DELTA MIXED CONDUCTORS - INTERPRETATION OF T-JUMP MEASUREMENTS AND EXPERIMENTS ON HYSTERESIS OF CONDUCTIVITY [J].