The equilibrium between water vapour, protons, and oxygen vacancies in rare earth oxides

被引:39
作者
Larring, Y
Norby, T
机构
关键词
rare earth oxides; conductivity; mobility; protons; oxygen vacancies; defect equilibrium;
D O I
10.1016/S0167-2738(97)00086-6
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The electrical conductivity of Nd2O3 and Sm2O3 doped with 1 and 2 mol % CaO respectively, and LaGdO3 doped with 5 mol % BaO has been measured as a function of p(O-2), p(H2O) and temperature. Computer fitting of the data to a simple model allows determination of entropy and enthalpy terms for the defect equilibrium between water vapour, oxygen vacancies and protons, together with the pre-exponential term and the activation enthalpy of the charge carrier mobilities. The entropies and enthalpies for these and other rare earth sesquioxides are compared to those of perovskites.
引用
收藏
页码:523 / 528
页数:6
相关论文
共 14 条
[1]   Proton conductivity: Materials and applications [J].
Kreuer, KD .
CHEMISTRY OF MATERIALS, 1996, 8 (03) :610-641
[2]   Water solubility, proton and oxygen diffusion in acceptor doped BaCeO3: A single crystal analysis [J].
Kreuer, KD ;
Dippel, T ;
Baikov, YM ;
Maier, J .
SOLID STATE IONICS, 1996, 86-8 :613-620
[3]   IN-SITU MEASUREMENTS OF THE WATER-UPTAKE IN YB DOPED SRCEO3 [J].
KRUG, F ;
SCHOBER, T ;
SPRINGER, T .
SOLID STATE IONICS, 1995, 81 (1-2) :111-118
[4]  
KRUG F, 1996, THESIS RWTH AACHEN
[5]  
Kubaschewski O., 1993, METALLURGICAL THERMO
[6]   PROTONS IN LAERO3 [J].
LARRING, Y ;
NORBY, T .
SOLID STATE IONICS, 1994, 70 :305-310
[7]   PROTONS IN RARE-EARTH-OXIDES [J].
LARRING, Y ;
NORBY, T .
SOLID STATE IONICS, 1995, 77 :147-151
[8]   PROTONS IN CA-DOPED LA2O3,ND2O3 AND LANDO3 [J].
NORBY, T ;
DYRLIE, O ;
KOFSTAD, P .
SOLID STATE IONICS, 1992, 53 :446-452
[9]   EMF METHOD DETERMINATION OF CONDUCTIVITY CONTRIBUTIONS FROM PROTONS AND OTHER FOREIGN IONS IN OXIDES [J].
NORBY, T .
SOLID STATE IONICS, 1988, 28 :1586-1591
[10]  
NORBY T, 1994, P ELECTROCERAMICS, V4, P703