Defect Structure of Flash‐Sintered Strontium Titanate
Flash sintering of strontium titanate (
3) is studied at different applied fields to understand its effect on density and grain growth. In particular, the defect structure is investigated by optical and structural analysis. SrTiO 3
exhibited a trend in densification opposite that of ionically or electronically conductive ceramics: as the applied voltage decreased, the density increased. Abnormal grain growth in conventionally sintered SrTiO 3 is arrested by flash sintering.
Interestingly, undoped SrTiO 3 behaved differently than undoped SrTiO 2 Al 3, which did not exhibit any signs of flash sintering. Previous
attempts at flash sintering could only be achieved in O ‐doped MgO 2 Al 3. We believe that non‐stoichiometric Ruddlesden‐Popper
phases in O 3, as indicated by ultrafast optical spectroscopy, SrTiO X‐ray diffraction, conductivity measurements, and transmission electron microscopy, assist flash sintering by increasing local conductivity through
enhanced defect content.
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Document Type: Research Article
Publication date: 2012-08-01