Optical properties of Bi12Si1−xTixO20 single crystals

Senulienė, D.; Babonas, G.-J.; Leonov, E. I.; Muminov, Islombek Arabboyevich; Орлов, В. М.

doi:10.1002/pssa.2210840114

Cited by 8 publications

(2 citation statements)

References 6 publications

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“…Assuming a direct allow transition in accordance with earlier investigations [14,15,21], the optical band gap (E g ) can be determined by plotting Senuliene et al [47], Borowiec [48], Kargin and Skorikov [41], and Zhang et al [21] reported values of 2.8 eV and 2.4 eV. On other hand, band gap values between 1.68 eV and 2.0 eV were also reported [14,15,24,27].…”

Section: F(r)supporting

confidence: 63%

Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Köferstein

Buttlar

Ebbinghaus

2014

Journal of Solid State Chemistry

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The syntheses of phase−pure and stoichiometric iron sillenite (Bi 25 FeO 40) powders by a hydrothermal (at ambient pressure) and a combustion−like process are described. Phase−pure samples were obtained in the hydrothermal reaction at 100 °C (1), whereas the combustion−like process leads to pure Bi 25 FeO 40 after calcination at 750 °C for 2 h (2a). The activation energy of the crystallite growth process of hydrothermally synthesized Bi 25 FeO 40 was calculated as 48(9) kJ mol −1. The peritectic point was determined as 797(1) °C. The optical band gaps of the samples are between 2.70(7) eV and 2.81(6) eV. Temperature and field−depending magnetization measurements (5−300 K) show a paramagnetic behaviour 2 with a Curie constant of 55.66•10 −6 m 3 •K•mol −1 for sample 1 and C = 57.82•10 −6 m 3 •K•mol −1 for sample 2a resulting in magnetic moments of µ mag = 5.95(8) µ B •mol −1 and µ mag = 6.07(4) µ B •mol −1. The influence of amorphous iron−oxide as a result of non-stoichiometric Bi/Fe ratios in hydrothermal syntheses on the magnetic behaviour was additionally investigated.

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Section: F(r)supporting

confidence: 63%

Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Köferstein

Buttlar

Ebbinghaus

2014

Journal of Solid State Chemistry

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“…32 However, Mn samples 22 , and other doped sillenites, 39,53 show a strong symmetric stretching mode and the intensity is attributed to a larger polarizability. In the IR spectra the 700-800 cm −1 modes tend to be stronger; 54,55 therefore, future infrared measurements could corroborate the pattern seen in the 760 cm −1 Raman mode.…”

Section: 22mentioning

confidence: 76%

Raman spectroscopy evidence of inhomogeneous disorder in the bismuth-oxygen framework of Bi25InO39and other sillenites

et al. 2012

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Absorption Centers of Bi12GeO20 and Bi12SiO20 Crystals

Oberschmid

1985

phys. stat. sol. (a)

149

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BSO) crystals is about 3.2 eV. The yellow color of these crystals is due t o a broad absorption shoulder in the photon energy range 2.3 eV < W < < 3.2 eV, where the dependence of the absorption coefficient a -(14' -2.3 eV), indicates an indirect optical transition. The variation of the optical absorption together with other physical properties such as lattice constant, mass density, photoconductivity, ultrasonic absorption, and melting temperature in different crystals and crystal regions indicate that BiGe, si centers are responsible for the absorption shoulder rather than Ge/Si vacancies as was previously assumed. Die Bandlucke von Bi,,GeO,, (BGO) und Bi,,SiO,, (BS0)-Kristallen liegt bei 3,2 el'. Die gelbe Farbe beider Kristalle ruhrt von einer Absorptionsschulter im Photonenenergiebereich 2,3 eV < Itr < < 3,2 eV her, wobei der Verlauf des Absorptionskoeffizienten a -(11--2,3 eV), einem indirelrten optischen nbergang entspricht. Aus der Variation der optischen Absorption zusammen mit physikalischen Eigenschaften wie Gitterkonstante, Massendichtr, Fotoleitfahigkeit, Ultraschallabsorption, Schmelztemperatur in verschiedenen Kristallen und Kristallbereichen wird geschlossen, daB fur diese Absorptionsschulter eher BiGe, si-Zentren verantwortlich sind als die bisher angenommenen Ge/Si-Leerstellen.

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Optical properties of Bi12Si1−xTixO20 single crystals

Cited by 8 publications

References 6 publications

Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Raman spectroscopy evidence of inhomogeneous disorder in the bismuth-oxygen framework of Bi25InO39and other sillenites

Absorption Centers of Bi12GeO20 and Bi12SiO20 Crystals

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