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Microscopic characterization of Fe nanoparticles formed on SrTiO 3 (001) and SrTiO 3 (110) surfaces

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ABSTRACT

Fe nanoparticles grown on SrTiO3 (STO) {001} and {110} surfaces at room temperature have been studied in ultrahigh vacuum by means of transmission electron microscopy and scanning tunnelling microscopy. It was shown that some Fe nanoparticles grow epitaxially. They exhibit a modified Wulff shape: nanoparticles on STO {001} surfaces have truncated pyramid shapes while those on STO {110} surfaces have hexagonal shapes. From profile-view TEM images, approximate values of the adhesion energy of the nanoparticles for both shapes are obtained.

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TEM profile-view images of Fe nanoparticles on substrate edges. a) Nanoparticles with OR1 orientation on STO (001); b) nanoparticles with OR2 orientation on STO (). Nanoparticles with minor orientations on c) STO(100) and d)STO (110).
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Figure 5: TEM profile-view images of Fe nanoparticles on substrate edges. a) Nanoparticles with OR1 orientation on STO (001); b) nanoparticles with OR2 orientation on STO (). Nanoparticles with minor orientations on c) STO(100) and d)STO (110).

Mentions: Nanoparticles observed from these directions are shown in the TEM images in Fig. 5. In Fig. 5, some nanoparticles with OR1 orientation are seen on a sample edge. In the central nanoparticle, atomic planes of Fe{110}, which make 45° angles to the edge STO(001) surface, are observed. It is outlined by a black polygonal line for clarity. The inset shows an atomic model of a Winterbottom shape, namely a truncated pyramid. In Fig. 5, nanoparticles being viewed from a different angle are observed. Despite the unclear outlines due to nanoparticles overlapping in the vertical direction (perpendicular to the paper), some of them show clear Fe{110} planes that appear as the orthogonal lattice. This implies the formation of an interface with OR2 orientation. The inset shows a model corresponding to this shape, namely distorted hexagon (hexagon1; hex1). The spacing of Fe{110} planes and the substrate STO{002} planes are 0.202 and 0.195 nm, respectively. Hence, the nanoparticles are under a compressive stress of about 3.6%. Closer look at the outlined nanoparticle reveals the gradual widening of atomic planes from the interface to the top surface to release compressive stress.


Microscopic characterization of Fe nanoparticles formed on SrTiO 3 (001) and SrTiO 3 (110) surfaces
TEM profile-view images of Fe nanoparticles on substrate edges. a) Nanoparticles with OR1 orientation on STO (001); b) nanoparticles with OR2 orientation on STO (). Nanoparticles with minor orientations on c) STO(100) and d)STO (110).
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Figure 5: TEM profile-view images of Fe nanoparticles on substrate edges. a) Nanoparticles with OR1 orientation on STO (001); b) nanoparticles with OR2 orientation on STO (). Nanoparticles with minor orientations on c) STO(100) and d)STO (110).
Mentions: Nanoparticles observed from these directions are shown in the TEM images in Fig. 5. In Fig. 5, some nanoparticles with OR1 orientation are seen on a sample edge. In the central nanoparticle, atomic planes of Fe{110}, which make 45° angles to the edge STO(001) surface, are observed. It is outlined by a black polygonal line for clarity. The inset shows an atomic model of a Winterbottom shape, namely a truncated pyramid. In Fig. 5, nanoparticles being viewed from a different angle are observed. Despite the unclear outlines due to nanoparticles overlapping in the vertical direction (perpendicular to the paper), some of them show clear Fe{110} planes that appear as the orthogonal lattice. This implies the formation of an interface with OR2 orientation. The inset shows a model corresponding to this shape, namely distorted hexagon (hexagon1; hex1). The spacing of Fe{110} planes and the substrate STO{002} planes are 0.202 and 0.195 nm, respectively. Hence, the nanoparticles are under a compressive stress of about 3.6%. Closer look at the outlined nanoparticle reveals the gradual widening of atomic planes from the interface to the top surface to release compressive stress.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Fe nanoparticles grown on SrTiO3 (STO) {001} and {110} surfaces at room temperature have been studied in ultrahigh vacuum by means of transmission electron microscopy and scanning tunnelling microscopy. It was shown that some Fe nanoparticles grow epitaxially. They exhibit a modified Wulff shape: nanoparticles on STO {001} surfaces have truncated pyramid shapes while those on STO {110} surfaces have hexagonal shapes. From profile-view TEM images, approximate values of the adhesion energy of the nanoparticles for both shapes are obtained.

No MeSH data available.


Related in: MedlinePlus