Compositional dependence of optical and vibrational properties of strontium barium niobate (SrxBa1–xNb2O6)

David, Calin; Tunyagi, A.; Betzler, K.; Wöhlecke, M.

doi:10.1002/pssb.200642370

Cited by 48 publications

(34 citation statements)

References 30 publications

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“…The 605 cm -1 subpeak belongs to an A 1 (TO) mode and the corresponding bulk value was 596 cm -1 . 23 The 290 cm -1 subpeak was not clearly observed in our bulk sample. It was assigned as the B 2 mode in published SBN Raman data [23][24][25][26] and the corresponding bulk value was around 304 cm -1 (SBN crystal).…”

Section: B Stresses In the Films Evaluated By Micro-raman Spectroscopymentioning

confidence: 55%

“…23 The 290 cm -1 subpeak was not clearly observed in our bulk sample. It was assigned as the B 2 mode in published SBN Raman data [23][24][25][26] and the corresponding bulk value was around 304 cm -1 (SBN crystal). 24 It is noticed that when the film thickness increased above 100 nm, the positions of these two modes in our thin film samples approached to those of the bulk values.…”

Section: B Stresses In the Films Evaluated By Micro-raman Spectroscopymentioning

confidence: 55%

“…For samples S1 ∼ S30, the band-gap energies were found to be 4.48, 4.38, 4.11, 3.96, 3.89, and 3.86 eV, respectively. The E g of SBN single crystal is reported to be 3.4 eV, 23 which is much smaller than those of the films. As shown in inset of Fig.…”

Section: Band-gap Energy and Pl Propertiesmentioning

confidence: 91%

“…They were assigned as the Nb-O stretching and O-Nb-O bending modes of the internal vibrations of NbO 6 octahedra, respectively. [23][24][25][26] These two A 1 (TO) bands were both deconvoluted into two subpeaks, as shown in Fig. 3(a) and 3(b).…”

Section: B Stresses In the Films Evaluated By Micro-raman Spectroscopymentioning

confidence: 99%

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Effects of stress on the optical properties of epitaxial Nd-doped Sr0.5Ba0.5Nb2O6 films

et al. 2011

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Nd-doped Sr0.5Ba0.5Nb2O6 (SBN) thin films with thicknesses ranging from 15 nm to 460 nm were grown on MgO (100) substrates using pulsed laser deposition technique. X-ray diffraction studies showed that the films were highly (001)-oriented and epitaxially grown on the substrates. Raman spectroscopy revealed the presence of residual stresses in the films especially for those with thicknesses below 100 nm. Transmittance and photoluminescence spectra revealed that the band-gap energies as well as the light-induced emission bands were shifted to higher energies as the film thickness decreased. The Nd3+ emission lines in the films were also dependent on film thickness. Origins of these observations were discussed based upon the stress as well as grain size effects.

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Section: B Stresses In the Films Evaluated By Micro-raman Spectroscopymentioning

confidence: 55%

Section: B Stresses In the Films Evaluated By Micro-raman Spectroscopymentioning

confidence: 55%

Section: Band-gap Energy and Pl Propertiesmentioning

confidence: 91%

Section: B Stresses In the Films Evaluated By Micro-raman Spectroscopymentioning

confidence: 99%

See 2 more Smart Citations

Effects of stress on the optical properties of epitaxial Nd-doped Sr0.5Ba0.5Nb2O6 films

et al. 2011

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“…To calculate this angle, we have assumed the fundamental beam at wavelength 1064 nm, and the SHG at 532 nm. We then take the corresponding refractive index of the Sr 0.61 Ba 0.39 Nb 2 O 6 crystal: n 1064nm = 2.22 and n 532nm = 2.32 [30]. From Eq.…”

Section: A Homogeneous Crystalmentioning

confidence: 99%

Wave-front phase-modulation control and focusing of second-harmonic light generated in transparent nonlinear random structures

et al. 2013

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We theoretically investigate how phase-only spatial light modulation can enable controlling and focusing the second-harmonic light generated in transparent nonlinear random structures. The studied structures are composed of domains with random sizes and antiparallel polarization, which accurately model widely used ferroelectric crystals such as strontium barium niobate. Using a first-principles Green-function formalism, we account for the effect that spatial light modulation of the fundamental beam introduces into the second-order nonlinear frequency conversion occurring in the considered class of structures. This approach provides a complete description of the physical origin of the second-harmonic light generation in the system, as well as the optimization of the light intensity in any arbitrary direction. Our numerical results show how the second-harmonic light is influenced by both the disorder in the structure and the boundaries of the crystal. Particularly, we find that the net result from the interplay between disorder and boundary effects is strongly dependent on the dimensions of the crystal and the observation direction. Remarkably, our calculations also show that although in general the maximum possible enhancement of the second-order light is the same as the one corresponding to linear light scattering in turbid media, in the Cerenkov phase matching direction the enhancement can exceed the linear limit. The theoretical analysis presented in this work expands the current understanding of light control in complex media and could contribute to the development of a new class of imaging and focusing techniques based on nonlinear frequency mixing in random optical materials.

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Raman spectroscopy study of reduced strontium barium niobate (SBN61) and hints of supergrowth or intergrowth structures

Primrose

Toulouse

Bock

et al. 2018

J Raman Spectroscopy

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Reduced strontium barium niobate, SrxBa1 − xNb2O6 (SBN), is a potential candidate for oxide thermoelectrics. In order to understand the effects of oxygen reduction on the structure and properties of SBN, room temperature Raman spectra of reduced and unreduced crystals with composition x = 0.61 (SBN61) have been measured, fitted, and compared, for incident light polarized successively along the crystallographic a‐ and c‐axes. Unexpectedly, the low wavenumber spectra (<200 cm−1) of reduced SBN are found to display much better resolved and intense peaks than those of unreduced SBN, suggestive of a more ordered and compact lattice arrangement in reduced SBN. Shape changes of certain peaks and the disappearance or appearance of other peaks (30 cm−1/1000 cm−1) are also observed as a result of reduction. Comparison of the experimental spectra and fits of the unreduced and reduced crystals are suggestive of a redistribution of the remaining oxygen anions, structural rearrangements, and the development of supergrowth or intergrowth structures in reduced SBN. The reduced spectra are found to be very similar to the published spectra of other complex oxides such as the H‐form of niobium oxide, H‐Nb2O5, or TiNb2O7, which are made up of a regular layered arrangement of blocks of corner‐sharing and edge‐sharing oxygen octahedra. These structural changes may play an important role in the enhanced electrical conductivity of reduced SBN perpendicular to the layers.

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Compositional dependence of optical and vibrational properties of strontium barium niobate (Sr_xBa_1–xNb₂O₆)

Cited by 48 publications

References 30 publications

Effects of stress on the optical properties of epitaxial Nd-doped Sr0.5Ba0.5Nb2O6 films

Effects of stress on the optical properties of epitaxial Nd-doped Sr0.5Ba0.5Nb2O6 films

Wave-front phase-modulation control and focusing of second-harmonic light generated in transparent nonlinear random structures

Raman spectroscopy study of reduced strontium barium niobate (SBN61) and hints of supergrowth or intergrowth structures

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