Tricritical point induced by atomic substitution in BixSb1–xSI

Teng, Miao; Massot, M.; Chaves, M. R.; Amaral, Maria Helena; Ziółkiewicz, S.; Young, William

doi:10.1002/pssa.2210630227

Cited by 14 publications

(3 citation statements)

References 14 publications

(3 reference statements)

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“…This dependence was calculated by Eqs. (11), (12). The displacements were taken with respect to the equilibrium positions of atoms.…”

Section: Investigation Of the Potential Energy Curve For The B 1u Sofmentioning

confidence: 99%

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Investigation of Vibrational Spectra of SbOxS1–xI Crystals in the Phase Transition Region

Audzijonis¹,

Žigas²,

Siroicas³

et al. 2004

Ferroelectrics

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SbO x S 1−x I (x = 0-0.5) crystals have been grown from the vapour phase. Reflection spectra of the SbO x S 1−x I (x = 0.2) crystals were studied by a modernized Fourier spectrometer. Using an improved Karmers-Kronig technique with two confining spectral limits, the spectra of optical parameters and optical functions were calculated. The vibrational frequencies ω L and ω T have been evaluated. The vibrational frequencies of SbSI and SbO x S 1−x I (x = 0.5) chains in different phases have been calculated in the harmonic approximation. The theoretical results are compared with experimental data. Taking into account the anharmonicity of the electronic structure and lattice, caused mainly by the phonon-phonon interaction, the phase transition temperature T C as a function of the mixture composition x has been evaluated. The dependence of the total potential energy function of the soft B 1u mode upon temperature determines variation of its frequency ω 2 s in the phase transition region.

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“…This dependence was calculated by Eqs. (11), (12). The displacements were taken with respect to the equilibrium positions of atoms.…”

Section: Investigation Of the Potential Energy Curve For The B 1u Sofmentioning

confidence: 99%

“…The IR vibrational and dielectric spectra and physical properties of mixed BiSI-SbSI, SbSI-SbSeI, SbSI-SbSBr crystals have been investigatid by various groups for a long time [8][9][10][11][12]. However, the vibrational spectra were theoretically studied only for pure SbSItype crystals [13].…”

Section: Introductionmentioning

confidence: 98%

Investigation of Vibrational Spectra of SbOxS1–xI Crystals in the Phase Transition Region

Audzijonis¹,

Žigas²,

Siroicas³

et al. 2004

Ferroelectrics

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“…They are influenced by light, leading to photoconductivity, photoferroelecticity, etc. Solid solutions of various combinations SbSISbSeI [6][7][8], SbSI-SbSBr [9,10], BiSI-SbSI [11][12][13] have been most intensively studied because they have the Curie temperatures depending on mixture composition. For example, the solid solutions SbSe x S 1-x I have the Curie temperature T C = 0-293 K, when x varies from 1 to 0.…”

Section: Introductionmentioning

confidence: 99%

Origin of soft mode in SbSexS1–xI crystals

Audzijonis¹,

Žigas²,

Siroic³

et al. 2004

Physica B: Condensed Matter

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Tricritical Point Induced by Atomic Substitution in SbSexS1−xI

Chaves

Amaral

Levelut

et al. 1982

phys. stat. sol. (a)

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Measurements of pyroelectric current in needle shaped crystals of SbSexS1−xI (x ⪅ 0.01, x = 0.30, 0.33, 0.34, 0.38, 0.40, 0.50, 0.65) are carried out by measuring the potential difference across a short circuiting resistance while heating the samples at uniform rates. These measurements, together with dielectric constant show that the critical temperature (Tc) follows a rapid linear decrease when x increases up to 0.65 with a slope of 33 K per 0.1 of Se concentration. The spontaneous polarization deduced from measurement of the pyroelectric current seems consistent with a mean field theory. It is found that a critical point, where the order of the transition changes from first to second, occurs at a value of x around 0.30 ± 0.03. The fact that the spontaneous polarization does not go to zero at the critical temperature but rather decreases gradually when the temperature increases, for T > Tc may be attributed to composition fluctuations and internal stresses.

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Tricritical point induced by atomic substitution in BixSb1–xSI

Cited by 14 publications

References 14 publications

Investigation of Vibrational Spectra of SbOxS1–xI Crystals in the Phase Transition Region

Investigation of Vibrational Spectra of SbOxS1–xI Crystals in the Phase Transition Region

Origin of soft mode in SbSexS1–xI crystals

Tricritical Point Induced by Atomic Substitution in SbSexS1−xI

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