Origin of the frequency shift of Raman scattering in chalcogenide glasses

Han, Xuecai; Tao, Haizheng; Gong, Lunjun; Wang, Xueye; Zhao, Xiujian; Yue, Yuanzheng

doi:10.1016/j.jnoncrysol.2014.03.021

Cited by 24 publications

(14 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Then, based on the evolution of Raman scattering spectra shown in Figure , we further explain why a negative deviation with R in H v and CTE occurs in the present glass series. Combined with the ab‐initio calculations of normal Raman modes, recent Raman scattering experiments confirmed that the shift of the main Raman scattering frequency in a glass should be attributed to the alteration of the nearest‐neighbor local surroundings. When it comes to the present glassy system, following the increase of R, the above‐mentioned negative deviation of shift of the peak position at ~1100 cm −1 should be ascribed to the weakening of the Si‐O stretching force in the main glassy network.…”

Section: Discussionmentioning

confidence: 86%

Mixed alkaline‐earth effect on the mechanical and rheological properties of Ca–Mg silicate glasses

Shan

Tao

2017

J Am Ceram Soc

Self Cite

View full text Add to dashboard Cite

In this article, we investigate the mixed alkaline-earth effect in a silicate glass series with varying the molar ratio of [MgO]/([CaO]+ [MgO]). This effect manifests itself as a minimum in Vickers microhardness (H V ), coefficient of thermal expansion (CTE), and isokom temperatures at 10 12 (T g ) and 10 2 PaÁs, and as a maximum in liquid fragility. To probe the structural origin of the mixed alkaline-earth effect in CTE and H v , we conducted the Raman measurements. In contrast to the aluminosilicate glasses, the present glass series exhibit a negative deviation of shift of peak position at~1100 cm À1 from a linear additivity, indicating the role of the aluminum speciation in affecting the vibration modes. By fitting the Vogel-Fulcher-Tamann equation to the high-temperature viscosity data, we found a near-linear increase of the fractional free volume with the gradual substitution of Ca by Mg, confirming the dynamic structural mismatch model describing the mixed modifier effect. This work gives insight into the mixed modifier effect in glassy systems. K E Y W O R D Sglass, hardness, mixed modifier effect, structure, viscosity

show abstract

Section: Discussionmentioning

confidence: 86%

Mixed alkaline‐earth effect on the mechanical and rheological properties of Ca–Mg silicate glasses

Shan

Tao

2017

J Am Ceram Soc

Self Cite

View full text Add to dashboard Cite

show abstract

“…, E u mode at 110 cm −1 for Bi 2 Se 3 and A 1 2u at 92 cm −1 for Bi 2 Te 3 , as indicated in Figure 6c [27,28,29]. It is assumed that the appearance of these modes is caused by the size effect in the nanoplatelets.…”

Section: Resultsmentioning

confidence: 99%

Raman Spectroscopy of Two-Dimensional Bi2TexSe3 − x Platelets Produced by Solvothermal Method

Yuan

Zhao

et al. 2015

Materials

View full text Add to dashboard Cite

In this paper, we report a facile solvothermal method to produce both binary and ternary compounds of bismuth chalcogenides in the form of Bi2TexSe3 − x. The crystal morphology in terms of geometry and thickness as well as the stoichiometric ratio can be well controlled, which offers the opportunities to systematically investigate the relationship between microstructure and phonon scattering by Raman spectroscopy. Raman spectra of four compounds, i.e., Bi2Se3, Bi2Se2Te, Bi2SeTe2 and Bi2Te3, were collected at four different excitation photon energies (2.54, 2.41, 1.96, and 1.58 eV). It is found that the vibrational modes are shifted to higher frequency with more Se incorporation towards the replacement of Te. The dependence of Raman vibrational modes on excitation photon energy was investigated. As the excitation photon energy increases, three Raman vibrational modes (A1g1, Eg2 and A1g2) of the as-produced compounds move to low frequency. Three Infrared-active (IR-active) modes were observed in thin topological insulators (TIs) crystals.

show abstract

“…16,19,20) Nevertheless, due to amorphous nature of the glasses and the proximity of the elements in the periodic table, Raman spectra generally exhibit broad bands where the peaks corresponding to the individual vibrations overlap each other. Although computer simulations using various methods can help in elucidating the origin of various Raman modes, 22,23) it is not generally easy to identify the individual feature of each vibration directly from the spectra. An alternative method is to measure Raman spectra of the number of glasses, and decompose them into several characteristic vibrations and finally analyze the evolution of the different structural units in the glass network in a logical way.…”

mentioning

confidence: 99%

Evidence of homopolar bonds in chemically stoichiometric Ge_xAs_ySe₁₋_x₋_y glasses

Xu¹,

Wang²,

Yang³

et al. 2014

Appl. Phys. Express

View full text Add to dashboard Cite

We prepared five samples of chemically stoichiometric Ge x As y Se 1%x%y glasses in order to examine whether homopolar bonds exist in these glasses. It is generally accepted that the structure of these chemically stoichiometric glasses should be dominated by GeSe 4/2 tetrahedra and AsSe 3/2 pyramids with a negligible quantity of homopolar bonds. Analysis of Raman scattering and X-ray photoelectron spectra of the glasses indicates that, while glasses located at the center of the glass-forming region primarily contain heteropolar bonds, a considerable number of homopolar bonds exists in glasses with extremely high Ge or As concentrations. This demonstrates that the formation of homopolar bonds might be intrinsic to chemically stoichiometric chalcogenide glasses.

show abstract

Origin of the frequency shift of Raman scattering in chalcogenide glasses

Cited by 24 publications

References 18 publications

Mixed alkaline‐earth effect on the mechanical and rheological properties of Ca–Mg silicate glasses

Mixed alkaline‐earth effect on the mechanical and rheological properties of Ca–Mg silicate glasses

Raman Spectroscopy of Two-Dimensional Bi2TexSe3 − x Platelets Produced by Solvothermal Method

Evidence of homopolar bonds in chemically stoichiometric Ge_xAs_ySe₁₋_x₋_y glasses

Contact Info

Product

Resources

About

Origin of the frequency shift of Raman scattering in chalcogenide glasses

Cited by 24 publications

References 18 publications

Mixed alkaline‐earth effect on the mechanical and rheological properties of Ca–Mg silicate glasses

Mixed alkaline‐earth effect on the mechanical and rheological properties of Ca–Mg silicate glasses

Raman Spectroscopy of Two-Dimensional Bi2TexSe3 − x Platelets Produced by Solvothermal Method

Evidence of homopolar bonds in chemically stoichiometric GexAsySe1−x−y glasses

Contact Info

Product

Resources

About

Evidence of homopolar bonds in chemically stoichiometric Ge_xAs_ySe₁₋_x₋_y glasses