Study of oxygen diffusion in dense lanthanum oxide ceramics
- 1 January 2021
- journal article
- research article
- Published by Ceramic Society of Japan in Journal of the Ceramic Society of Japan
- Vol. 129 (1), 79-82
- https://doi.org/10.2109/jcersj2.20127
Abstract
A direct oxygen diffusion study using isotopes in dense La2O3 ceramics fabricated with the addition of Sr and Ge oxides was performed by secondary-ion mass spectrometry. The experiments using the 18O isotope were carried out in the temperature range 400–700 °C for 1 h. The surface concentration of 18O was found to depend on the annealing temperature. The temperature dependence of oxygen diffusion was determined to be expressed as D*(cm2/s) = (8.9 × 10−3)exp(−128.8[kJ/mol]/RT), where D* is the diffusion coefficient, R is the gas constant, and T is temperature. On the basis of a comparison with the results of oxygen diffusion studies of CeO2 and LaGaO3, we concluded that oxygen diffusion in La2O3 occurs via a vacancy mechanism.Keywords
This publication has 9 references indexed in Scilit:
- Oxygen pumping based on c-axis-oriented lanthanum silicate ceramics: challenge toward low operating temperatureJournal of the Ceramic Society of Japan, 2019
- Zn and Sb interaction and oxygen defect chemistry in dense SnO2 ceramics co-doped with ZnO and Sb2O5Journal of the Ceramic Society of Japan, 2014
- Characteristics and mechanism of nano‐polycrystalline La2O3 thin‐film resistance switching memoryPhysica Status Solidi (RRL) – Rapid Research Letters, 2013
- Proton conduction in rare-earth ortho-niobates and ortho-tantalatesNature Materials, 2006
- Effective mobility and interface-state density of La2O3 nMISFETs after post deposition annealingIEICE Electronics Express, 2006
- La–silicate gate dielectrics fabricated by solid phase reaction between La metal and SiO2 underlayersApplied Physics Letters, 2003
- Effect of water vapour on oxygen exchange kinetics of ceria and zirconia solid electrolytesPhysical Chemistry Chemical Physics, 2003
- Effect of Water on Oxygen Transport Properties on Electrolyte Surface in SOFCsJournal of the Electrochemical Society, 2003
- Oxygen Self-Diffusion in Cerium OxideJournal of the Ceramic Society of Japan, 1998