Mass transport in La 1− xSr xFeO 3( x=0 and 0.1) measured by SIMS

Abstract

Tracer diffusion coefficients in La 1− x Sr x FeO 3, x=0 and 0.1 from 900 to 1100 °C for both A- and B-site diffusions were examined with secondary ion mass spectrometry (SIMS) applying Y 3+ and Cr 3+ as tracers. In both compositions, the B-site diffusion, represented by Cr, was found to be faster than the A-site diffusion, represented by Y. The obtained activation energies for bulk diffusion in La 0.9Sr 0.1FeO 3 were 168±24 kJ/mol for the Y tracer and 150±30 kJ/mol for the Cr tracer. The 18O-tracer diffusion coefficients were found to be significantly higher in La 0.9Sr 0.1FeO 3 compared with LaFeO 3.