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High performance lead free ferroelectric ATiO3/SnTiO3 superlattices
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Image of FIG. 1.
FIG. 1.

The superlattices of 1 layer TiO ( = Ca, Sr, Ba) and 1 layer SnTiO (SNO). (a) 1 × 1 × 2 phase perovskite SNO/ATO; (b) 1 × 1 × 2  phase perovskite SNO/ATO; (c) 2 × 3 × 2 ilmenite SNO and perovskite ATO, the interface configuration is SNO(11–20)/ATO(001) according to the experimental results from Ref. . The gray, green, blue and red balls are Sn, A-cations, Ti and O, respectively. The arrows indicate the polarization directions. Due to the phase transition induced by the external strain, there are two perovskite phase: and , which will be discussed in detail below.

Image of FIG. 2.
FIG. 2.

Polarization of TO/SNO ( = Ca, Sr, Ba) as a function of the -plane lattice constant. Solid dots are tetragonal phase () and open dots are monoclinic phase (), respectively. The polarization directions are shown in Fig. 1 . The equilibrium lattice constants are 3.85 Å for CTO/SNO, 3.90 Å for STO/SNO and 3.95 Å for BTO/SNO, respectively.

Image of FIG. 3.
FIG. 3.

(a) The polarization direction in the monoclinic () phase as a function of the -plane lattice constant. θ = 0°or 90° means that the polarization is along [001] or [110], respectively. (b) The polarization rotation path. The yellow solid arrow indicates the polarization direction in the phase. The shadowed area (blue) is the (−110) plane.

Image of FIG. 4.
FIG. 4.

Spontaneous polarizations of perovskite phase (ATO)/(SNO) as a function of the layer thickness, i.e., the interfaces separation distance.


Generic image for table
Table I.

Interfacial binding energies for the SLs. The values for ATO/P-SNO (both and ) are all much lower that those for ATO/I-SNO (). The unit is eV/formula unit.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High performance lead free ferroelectric ATiO3/SnTiO3 superlattices