Lattice Vibrations and Interlayer Interactions in Crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">As</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:ma

Zallen, Richard; Slade, M. L.; Ward, A. T.

doi:10.1103/physrevb.3.4257

Cited by 263 publications

(43 citation statements)

References 24 publications

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“…In the photon energy interval between 2.5 and 6.2 eV a broad double reflectivity peak is observed in accordance with results of earlier studies [2,[10][11][12], and can be attributed to electronic transitions from the valence band to the conduction band minimum. According to band structure calculations in a tight-binding approximation [13,14], the states near the valence band edge of As 2 S 3 result predominantly from the p-orbital electron lone-pair of the chalcogen atom (low-energy side of the reflectivity peak in Fig.2), and the high-energy side of the peak is due to p-and -orbital states of chalcogen.…”

Section: Uv-vis Reflectivity Spectra In the Fundamental Absorption Resupporting

confidence: 80%

Spectroscopic studies of bulk AS 2 S 3 glasses and amorphous films doped with Dy, Sm and Mn

et al. 2002

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The effect of rare earth (Dy and Sm) and transition metal (Mn) luminescent impurities on the optical properties of As 2 S 3 glass is studied in a wide spectral region. The Raman, infrared, band-to-band and edge absorption spectroscopies are employed to obtain information about the incorporation of impurity ions in the host glass structure and the corresponding changes in intrinsic optical characteristics. The effects of light-soaking and thermal treatment on the doped As 2 S 3 glasses were examined as well. In the fundamental absorption region a reflectivity maximum at 2.98 eV shows blue (Dy, Sm) or red (Mn) shift depending on the electronegativity of the impurity, in accordance with the corresponding variations of the glass structure. Near the edge absorption the impurity affects strongly the slope and the magnitude of the weak absorption tail. In the wide range of transparency the addition of impurity suppresses several absorption bands indicating the interaction of dopants with the host glass contaminations. Some variations of the characteristic Raman spectra under light exposure and thermal ageing of doped glasses were registered. The observed effects of metal dopants on the As 2 S 3 glass are discussed in connection with the expected behaviour of the impurities in the glass.

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Section: Uv-vis Reflectivity Spectra In the Fundamental Absorption Resupporting

confidence: 80%

Spectroscopic studies of bulk AS 2 S 3 glasses and amorphous films doped with Dy, Sm and Mn

et al. 2002

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“…Unfortunately, our RS spectrum of crystalline α-As 2 Te 3 cannot be compared to previous measurements since this is the first time this RS spectrum is reported to the best of our knowledge. However, we must note that our RS spectrum is consistent with RS spectra reported in glasses containing As and Te (see discussion in the Supporting Information), which show vibrational frequencies [72][73][74][75][76][77][78] below 200 cm -1 . In this regard, it must be stressed that the RS spectrum of α-As 2 Te 3 resembles that of crystalline Te since the most intense mode of the RS spectrum of α-As 2 Te 3 (the A g 7 mode around 120 cm -1 ) occurs at a similar frequency as the most intense mode (A 1 mode) of crystalline Te 79 .…”

supporting

confidence: 65%

Structural, Vibrational, and Electronic Study of α-As₂Te₃ under Compression

et al. 2016

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We report a study of the structural, vibrational, and electronic properties of layered monoclinic arsenic telluride (α-As 2 Te 3 ) at high pressures. Powder x-ray diffraction and Raman scattering measurements up to 17 GPa have been complemented with ab initio total-energy, lattice dynamics, and electronic band structure calculations. Our measurements, which include previously unreported Raman scattering measurements for crystalline α-As 2 Te 3 , show that this compound undergoes a reversible phase transition above 14 GPa at room temperature. The monoclinic crystalline structure of α-As 2 Te 3 and its behavior under compression are analysed by means of the compressibility tensor. Major structural and vibrational changes are observed in the range between 2 and 4 GPa and can be ascribed to the strengthening of interlayer bonds. No evidence of any isostructural phase transition has been observed in α-As 2 Te 3 . A comparison with other group-15 sesquichalcogenides allows understanding the structure of α-As 2 Te 3 and its behavior under compression based on the activity of the cation lone electron pair in these compounds. Finally, our electronic band structure calculations show that α-As 2 Te 3 is a semiconductor at 1 atm, which undergoes a trivial semiconducting-metal transition above 4 GPa.The absence of a pressure-induced electronic topological transition in α-As 2 Te 3 is discussed.

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“…In general, it is expected that lower symmetry phases have more peaks than their higher symmetry counterparts; however, in this case, the AsÀS bond length as well as the AsÀSÀAs and SÀAsÀS angle distributions are narrow and similar between the two and, consequently, there are related modes that are nearly degenerate. The vibrational spectrum of orpiment has been described in detail by Zallen et al (1971), and it is expected that their analysis can be applied to anorpiment.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Anorpiment, As₂S₃, the triclinic dimorph of orpiment

Kampf¹,

Downs²,

Housley³

et al. 2011

Mineral. mag.

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The new mineral anorpiment, As 2 S 3 , the triclinic dimorph of orpiment, has space group P1 and cell parameters a = 5.7577(2), b = 8.7169(3), c = 10.2682(7) Å , a = 78.152(7), b = 75.817(7), g = 89.861(6)º, V = 488.38(4) Å 3 and Z = 4. It occurs at the Palomo mine, Castrovirreyna Province, Huancavelica Department, Peru. It is a low-temperature hydrothermal mineral associated with dufrénoysite, muscovite, orpiment, pyrite and realgar. It occurs in drusy crusts of wedge-shaped, transparent, greenish yellow crystals. The streak is yellow. The lustre is resinous on crystal faces, but pearly on cleavage surfaces. The Mohs hardness is about 1Ý. The mineral is sectile with an irregular fracture and one perfect and easy cleavage on {001}. The measured and calculated densities are 3.33 and 3.321 g cm À3 , respectively. All indices of refraction are greater than 2. The mineral is optically biaxial (À) with 2V = 35À40º and no observed dispersion As and S atoms. Each S atom bonds to two As atoms at AsÀSÀAs angles between 100.45 and 104.15º. Each As atom is strongly bonded to three S atoms at SÀAsÀS angles between 91.28 and 103.59º, forming an AsS 3 pyramid with As at its apex. The AsÀS linkages within the layers form rings of six AsS 3 pyramids. Interlayer bonding forces are interpreted as van der Waals. The structure of anorpiment is similar to that of orpiment in that it is composed of layers of As 2 S 3 macromolecules, but arranged in a different stacking sequence.

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Lattice Vibrations and Interlayer Interactions in CrystallineAs2S3

Cited by 263 publications

References 24 publications

Spectroscopic studies of bulk AS 2 S 3 glasses and amorphous films doped with Dy, Sm and Mn

Spectroscopic studies of bulk AS 2 S 3 glasses and amorphous films doped with Dy, Sm and Mn

Structural, Vibrational, and Electronic Study of α-As₂Te₃ under Compression

Anorpiment, As₂S₃, the triclinic dimorph of orpiment

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Lattice Vibrations and Interlayer Interactions in CrystallineAs2S3

Cited by 263 publications

References 24 publications

Spectroscopic studies of bulk AS 2 S 3 glasses and amorphous films doped with Dy, Sm and Mn

Spectroscopic studies of bulk AS 2 S 3 glasses and amorphous films doped with Dy, Sm and Mn

Structural, Vibrational, and Electronic Study of α-As2Te3 under Compression

Anorpiment, As2S3, the triclinic dimorph of orpiment

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Product

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Structural, Vibrational, and Electronic Study of α-As₂Te₃ under Compression

Anorpiment, As₂S₃, the triclinic dimorph of orpiment