2002
DOI: 10.1007/bf02376076
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Crystal structure and electrical conductivity correlation in CaTi1−xFexO3−δ system

Abstract: Abstract. The structural refinements of CaTil.xFexO3_ ~ (x = 0 -0.4) were performed by means of the X-ray data full-profile analysis method on the basis of the orthorhombic perovskite structure (space group Pbnm). The lattice parameters, atomic coordinates, occupancies and equivalent isotropic temperature factors were refined. The characteristic Debye temperature value was determined for the composition x = 0.25 by analysis of the temperature dependence of X-ray reflections intensity. Using the structural refi… Show more

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Cited by 13 publications
(22 citation statements)
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“…These data are similar to those on the dependence of ionic conductivity on substitute concentration in CaTil_xFexO3_ s [6,7]. It was supposed [6] that in substituted calcium titanate, formation of complexes of substitution defects (FeTi) and oxygen vacancy complexes starts near x = 0.2 and this is a reason of ionic conductivity decrease. This scheme of defect formation is applicable to CaTil_xAlxO3_ 5 as long as it has the same crystal symmetry.…”
supporting
confidence: 82%
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“…These data are similar to those on the dependence of ionic conductivity on substitute concentration in CaTil_xFexO3_ s [6,7]. It was supposed [6] that in substituted calcium titanate, formation of complexes of substitution defects (FeTi) and oxygen vacancy complexes starts near x = 0.2 and this is a reason of ionic conductivity decrease. This scheme of defect formation is applicable to CaTil_xAlxO3_ 5 as long as it has the same crystal symmetry.…”
supporting
confidence: 82%
“…Recent studies show that in alkali earth titanates CaTit_xFexO3~ (A = Ca, St, Ba), Fe-substitution leads to a considerable rise in conductivity, however the dependence of ionic conductivity on the dopant concentration is nonmonotone: increase in ionic conductivity at low iron contents (x < 0.2) is followed by decrease at higher x [6,7]. It will be interesting to investigate ionic conduction in the perovskite-type oxides doped with other cations of valence lower than that of Ti.…”
Section: Introductionmentioning
confidence: 98%
“…X-ray diffraction does not show long-range ordering of the oxygen vacancies in the region of x = 0.05 -0.38 in CaTil_xFexO3.x/2 system, which was confirmed by transmission electron microscopy measurements [13]. According to the refined X-ray powder diffraction data for CaTil_xFexO3.8 (x = 0 -0.4) presented in [14], the symmetry of the samples is orthorhombic and there is no evidence of ordering of oxygen vacancies. Summarizing the results of [12][13][14], one can conclude that for the CaTil.xFexO3.…”
Section: Introductionsupporting
confidence: 60%
“…According to the refined X-ray powder diffraction data for CaTil_xFexO3.8 (x = 0 -0.4) presented in [14], the symmetry of the samples is orthorhombic and there is no evidence of ordering of oxygen vacancies. Summarizing the results of [12][13][14], one can conclude that for the CaTil.xFexO3. ~ system disordered substitutional solid solutions are formed within the Fe concentration range of x < 0.4.…”
Section: Introductionmentioning
confidence: 99%
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