Strain-controlled optical absorption in epitaxial ferroelectric BaTiO3 films

Chernova, E.; Pacherová, O.; Chvostová, D.; Dejneka, A.; Kocourek, T.; Jelínek, M.; Tyunina, M.

doi:10.1063/1.4921083

Cited by 30 publications

(18 citation statements)

References 27 publications

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“…The dielectric functions and optical constants of the films were extracted from the ellipsometric spectra using a commercial WVASE32 software package. More details for the ellipsometric procedures can be found elsewhere [23][24][25].…”

Section: Methodsmentioning

confidence: 99%

Oxygen vacancy dipoles in strained epitaxial BaTiO3 films

Tyunina

Peräntie

Kocourek

et al. 2020

Phys. Rev. Research

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The existence of out-of-plane-oriented oxygen vacancy dipoles was experimentally established in (001) perovskite epitaxial films of ferroelectric barium titanate by analyses of the crystal and electronic structure as well as the ferroelectric and optical properties. The formation of the defects was shown to occur in the presence of in-plane compressive strain and oxygen-deficient deposition conditions. The in-plane compressive strain was suggested to favor the formation of oxygen vacancies V O in the Ba-O planes and thus stabilize the out-of-plane orientation of the dipolar (V +2 O-Ti 3+) + defects.

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Section: Methodsmentioning

confidence: 99%

Oxygen vacancy dipoles in strained epitaxial BaTiO3 films

Tyunina

Peräntie

Kocourek

et al. 2020

Phys. Rev. Research

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“…The BTO film was grown on top of the STO single-crystalline substrate by pulsed laser deposition (Chernova et al, 2015). Because of the mismatch between the lattice parameters of BTO and STO, the theoretical biaxial in-plane (parallel to the substrate surface) misfit strain is $2.5% compressive in BTO at the deposition temperature of 973 K. The misfit strain is known to relax with increasing film thickness and it may be completely relaxed in BTO at the growth temperature.…”

Section: Methodsmentioning

confidence: 99%

Quantitative analysis of structural inhomogeneity in nanomaterials using transmission electron microscopy

et al. 2016

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A method for quantifying inhomogeneity of crystal structure at the nanoscale is suggested and experimentally verified. The method is based on digital processing of images obtained by high-resolution transmission electron microscopy. A series of images is acquired and each image is divided into several overlapping sliding windows. Interplanar distances are determined using a fast Fourier transform and the CrysTBox software. A spatial distribution of the estimated distances is obtained considering the size and position of the sliding window within the analysed sample. This approach provides for a picometric precision and accuracy if applied on ideal data. Although this accuracy was verified on experimental data, it can be worsened by errors specific to a particular application and data acquisition technique. The achieved spatial resolution ranges from a few to tens of nanometres. These levels of accuracy, precision and spatial resolution are reached without the need for aberration correction or for a reference lattice parameter, and using samples prepared by focused ion beam milling.

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“…In addition to that, this compressive strain found in treated BaTiO 3 may lead to reduce the symmetry of the crystal structure. The reduction in symmetry probably enhanced the piezoelectric properties in treated BaTiO 3 as compared to control [8,9].…”

Section: Resultsmentioning

confidence: 99%

“…Recently, it was reported that distortion in perovskite BatiO 3 reduced symmetry, which enhanced its magnetic and electrical properties [7]. Moreover, Chernova et al demonstrated that strain induced in BaTiO 3 unit cell enhanced its ferroelectric polarizations [8]. Thus, after considering the vast importance of BatiO 3 and its crystal structure in several applications, authors wish to investigate an approach that could be beneficial to modify the atomic Impact of Biofield Treatment on Atomic and Structural Characteristics of Barium Titanate Powder and structural properties of BatiO 3 powder.…”

Section: Introductionmentioning

confidence: 99%

Impact of Biofield Treatment on Atomic and Structural Characteristics of Barium Titanate Powder

G¹

2015

Ind Eng Manage

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Barium titanate, perovskite structure is known for its high dielectric constant and piezoelectric properties, which makes it interesting material for fabricating capacitors, transducer, actuator, and sensors. The perovskite crystal structure and lattice vibrations play a crucial role in its piezoelectric and ferroelectric behavior. In the present study, the barium titanate powder was subjected to biofield treatment. Further, the control and treated samples were characterized using X-ray diffraction (XRD) and Fourier transform infrared spectrometer (FT-IR) and Electron spin resonance (ESR). The XRD analysis showed the permanent compressive strain of 0.45% in treated barium titanate powder as compared to control. Furthermore, the biofield treatment has enhanced the density upto 1.38% in barium titanate as compared to control. The FT-IR spectra showed that the stretching and bending vibrations of Ti-O bond in treated BaTiO 3 were shifted towards lower frequency as compared to control. The bond length was substantially increased by 0.72 % in treated BaTiO 3 as compared to control. The ESR spectra of control and treated BaTiO 3 sample showed the g-factor of 2.0; and biofield treatment has substantially changed the width and height of ESR signal in treated BaTiO 3 as compared to control. These observations revealed that biofield treatment has significantly altered the crystal structure, lattice strain, and bond vibration of barium titanate.

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Strain-controlled optical absorption in epitaxial ferroelectric BaTiO3 films

Cited by 30 publications

References 27 publications

Oxygen vacancy dipoles in strained epitaxial BaTiO3 films

Oxygen vacancy dipoles in strained epitaxial BaTiO3 films

Quantitative analysis of structural inhomogeneity in nanomaterials using transmission electron microscopy

Impact of Biofield Treatment on Atomic and Structural Characteristics of Barium Titanate Powder

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