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Interdiffusion and Kirkcndall Effect in Doped Barium Titanate‐Strontium Titanate Diffusion Couples
Author(s) -
Gopalan Srikanth,
Virkar Anil V.
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08427.x
Subject(s) - kirkendall effect , materials science , doping , barium titanate , diffusion , dopant , vacancy defect , titanate , strontium titanate , strontium , lattice (music) , analytical chemistry (journal) , mineralogy , condensed matter physics , thin film , thermodynamics , chemistry , ceramic , nanotechnology , metallurgy , physics , optoelectronics , organic chemistry , chromatography , acoustics
Interdiffusion in perovskites (ABO 3 ‐A'BO 3 ) has been investigated, theoretically and experimentally. A theoretical model along the lines of L. S. Darken's analysis has been developed. The model lays down the criteria for the occurrence of Kirkendall effect in perovskites. It has been demonstrated that the lattice velocity should display a maximum at some concentration of a dopant that increases the vacancy concentration on the A‐A′sublattice in ABO 3 ‐A'BO 3 diffusion couples. Interdiffusion coefficients in “La 2/3 TiO 3 ” doped barium titanate‐strontium titanate couples have been measured at 1573 K. As judged on the basis of porosity formation, the lattice velocity in these couples seems to exhibit a maximum at some concentration of La 2/3 TiO 3 , in accord with theoretical predictions.