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Correlation between structure, dielectric, and ferroelectric properties in solid solution thin films
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Image of FIG. 1.
FIG. 1.

(A) AFM topography phase images of BFO-2LM, (B) BFO-5LM, and (C) BFO-8LM.

Image of FIG. 2.
FIG. 2.

Room-temperature XRD patterns of thin film specimens: (a) (, 2%, 4%, 5%, 6%, 8%, and 10%); (b) BFO-5La and BFO-5Mn.

Image of FIG. 3.
FIG. 3.

Variation of lattice parameters ratio vs composition for series.

Image of FIG. 4.
FIG. 4.

High resolution XPS spectra of Bi, Fe, and Mn in BFO-10LM thin films. Deconvolutions of the peaks are also shown.

Image of FIG. 5.
FIG. 5.

Temperature dependence of the dielectric constant of (A) BFO-4LM and (b) BFO-5Mn at different frequencies. The behavior of BFO and BFO-5La is also shown in (b). (c) shows semilogarithmic plot of vs for BFO-4LM.

Image of FIG. 6.
FIG. 6.

The leakage current properties at room temperature: (a) curves for the different compositions investigated, except BFO-5La; (b) shows the dependence of leakage current density, , on LMnO content. Values of are given at an applied dc electric field of 150 kV/cm for BFO-LM, and at 85 kV/cm for pure BFO. The line is a guide for the eyes; (c) represents the dependence of the effective activation energy for conduction on the reciprocal of temperature and calculation of the trap depth assuming the Frenkel–Poole mechanism, Eq. (4). The mean square root regression line is also shown.

Image of FIG. 7.
FIG. 7.

Room-temperature hysteresis loops of (a) BFO-2LM, (b) BFO-5LM, (c) BFO-6LM, and (d) BFO-10LM at 1, 5, and 10 kHz.

Image of FIG. 8.
FIG. 8.

Remnant polarization, , and saturation polarization, , dependence on LMO content. The polarization values are given at 10 kHz testing frequency and room temperature. The orthorhombic distortion, , is also shown. The lines are guides for the eye.

Image of FIG. 9.
FIG. 9.

hysteresis loops of BFO-5Mn thin film at different frequencies.

Image of FIG. 10.
FIG. 10.

Structure of BFO based on Ref. 35 showing octahedra and three Fe–O bond lengths (outlined).


Generic image for table
Table I.

Lattice parameter ratios , , and and calculated cell volumes of and BFO-5Mn.

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Table II.

XPS binding energies of BFO-10LM.

Generic image for table
Table III.

Activation energy, and the prefactor of the solid solutions investigated as well as BFO-5Mn.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Correlation between structure, dielectric, and ferroelectric properties in BiFeO3–LaMnO3 solid solution thin films