Abstract
Defect-reduction process in SrTiO 3 by Al addition has been investigated by using high-resolution transmission electron microscope (HRTEM) images, X-ray diffraction (XRD) patterns and photoluminescence (PL) spectra. HRTEM images in SrTiO 3 : Pr 3+ show the reduction of planar faults by Al addition. The planar faults are probably SrO thin layers. In Eu-doped SrTiO 3 reduced by firing in hydrogen atmosphere, Ruddlesden–Popper phases Sr n+1 Ti n O 3 n+1 (n=1, 2,…, ∞) are precipitated in SrTiO 3, as confirmed by XRD patterns. Sr n+1 Ti n O 3 n+1 consists of a SrO planar fault interleaved with SrTiO 3 slabs. With Al addition, the planar faults cannot be easily formed. Instead, strontium aluminates, SrAl 2O 4 or/and SrAl 12O 19, as well as SrTiO 3 are precipitated, as a result of scavenging the SrO planar faults by added Al. The precipitation is confirmed also by PL from Eu 2+ in the strontium aluminates.
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