Study of As-Sb-Se chalcogenide glasses by NQR and EPR spectroscopy methods

Glotova, Olga; Korneva, I. P.; Sinyavsky, N.; Dobosz, Bernadeta; Krzyminiewski, Ryszard; Jadzyn, Maciej; Ostafin, M.; Nogaj, B.

doi:10.2478/s11534-010-0138-1

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…A glass structure formed by a random distribution of trigonal (AsS 3/2 ) and (SbS 3/2 ) pyramidal units bridged by sulfur atoms was proposed. Glotova and coworkers [23] (Fig. 2).…”

Section: Introductionmentioning

confidence: 88%

Thermoanalytical properties and structure of (As2Se3)100−x(Sb2Se3)x glasses by Raman and 77Se MAS NMR using a multivariate curve resolution approach

Černošková

Holubová

Bureau

et al. 2016

Journal of Non-Crystalline Solids

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The basic thermoanalytical characteristics and structure of (As 2 Se 3) 100-x (Sb 2 Se 3) x bulk glasses over the whole glass-forming region (x = 0-50) were studied by DSC, StepScan DSC and both Raman and 77 Se MAS NMR spectroscopies. The glass transition temperature, T g , was found to increase only slightly from 184 to 190 °C with increasing Sb 2 Se 3 content, and the changes in the isobaric heat capacity at T g are also nearly compositionally independent. However, the isobaric heat capacity of glasses decreases 2 because of the higher atomic mass of antimony. The undercooled melts undergo crystallization when heated; As 2 Se 3 crystallizes for x  20, and both stoichiometric triselenides crystallize for higher x. 77 Se MAS NMR spectroscopy was used for the first time in the structural study of this pseudobinary system. The results of both NMR and Raman spectroscopies were combined, and their chemometric analysis was used to elucidate the structure of the glasses over the whole glass-forming region. It was concluded that the structure is based on randomly distributed AsSe 3/2 and SbSe 3/2 trigonal pyramids bridged by common selenium atoms and corresponds to the transition structure between a "random covalent network model" (RCNM) and a "chains crossing model" (CCM).

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“…A glass structure formed by a random distribution of trigonal (AsS 3/2 ) and (SbS 3/2 ) pyramidal units bridged by sulfur atoms was proposed. Glotova and coworkers [23] (Fig. 2).…”

Section: Introductionmentioning

confidence: 88%

Thermoanalytical properties and structure of (As2Se3)100−x(Sb2Se3)x glasses by Raman and 77Se MAS NMR using a multivariate curve resolution approach

Černošková

Holubová

Bureau

et al. 2016

Journal of Non-Crystalline Solids

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“…The interpretation of the experimental results of the CGS research is carried out on the basis of assumptions about clustering structure, as discussed above. Publications [11,12] include the NQR spectra and spectral parameters of 75 As, 121 Sb and 123 Sb (T = 77 K) glassy systems of Ge-As-Se and As-Sb-Se in the frequency range of 48-70 MHz.…”

Section: The Interpretation Of the Experimental Results Of The Cgs St...mentioning

confidence: 99%

“…75 As NQR spectra and their frequencies and linewidths for chalcogenide semiconductors of Ge-As-Se different compositions are presented in our previous work [11]. The NQR and EPR spectra of 75 As, 121 Sb and 123 Sb and their frequencies and the width of the NQR lines, the EPR parameters for the chalcogenide semiconductors of different compositions of As-Sb-Se are presented in our paper [12].…”

Section: Analysis Of the Nqr And Epr Spectra Of Ge-as-se And As-sb-se...mentioning

confidence: 88%

Experimental study of the structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and As-Sb-Se by means of NQR and EPR spectroscopy

et al. 2013

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Abstract:The structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and AsSb-Se has been studied by means of both NQR (nuclear quadrupole resonance) and EPR (electron paramagnetic resonance) spectroscopy. It is investigated that in the glasses of both systems the value of the electric field gradient at the resonating nuclei grows with increasing concentration of the clusters As 2 Se 3 and Sb 2 Se 3 , thereby increasing the NQR resonance frequencies. It appears that for the Ge-As-Se system the structural transition from a two-dimensional to three-dimensional structure occurs at average coordination number¯ = 2.45. The EPR spectral parameters of glasses depend on the composition, the average coordination number and the temperature, and these are discussed. The effect of "ageing" for CGS (chalcogenide glassy semiconductors) of As-Sb-Se system due to partial crystallization of the sample is observed from the EPR spectra.

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“…The results of our study of the NQR spectra of Ge-As-Se-type CGS appear to show that the change in the chemical composition of these CGS leads to significant differences in their NQR spectra. [2,18] While doing the study of the dependence of internal friction in Ge-As-Se CGS on the average coordination number in, [19] conclusions were made that with increasing r up to the value of 2.27-2.56, a transition from a one-dimensional to a two-dimensional structure, similar to that of As 2 Se 3 , is possible. According to the results of a crystalline As 2 Se 3 in [20,21] the arsenic atom occupies two equivalent positions that differ in the asymmetry parameter of the EFG tensor.…”

Section: Interpretation and Discussion Of The Experimental Datamentioning

confidence: 99%

Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses

Bolebrukh

Sinyavsky

Dobosz

et al. 2013

Magnetic Reson in Chemistry

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Asymmetry parameters of the electric field gradient tensor at (75) As nuclei were determined for chalcogenide glassy semiconductors (CGS) of the Ge-As-Se system by comparing the experimental and simulated (75) As nuclear quadrupole resonance nutation interferograms. The electric field gradient asymmetry in CGS was analyzed, and it is believed that a structural change in these glassy semiconductors takes place at r¯ = 2.425. Electron paramagnetic resonance spectra of the Ge-As-Se system were obtained for the first time. A comparison was made between the results of analysis of the Ge-As-Se system by nuclear quadrupole resonance and electron paramagnetic resonance methods, and this allowed us to make the supposition that a structural phase transition occurs at r¯ = 2.4 from two-dimensional to three-dimensional CGS structure.

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Study of As-Sb-Se chalcogenide glasses by NQR and EPR spectroscopy methods

Abstract: Abstract:In this paper experimental results obtained by both 75 As NQR and EPR spectroscopy are presented for the three-component system As-Sb-Se.

Cited by 3 publications

References 7 publications

Thermoanalytical properties and structure of (As2Se3)100−x(Sb2Se3)x glasses by Raman and 77Se MAS NMR using a multivariate curve resolution approach

Thermoanalytical properties and structure of (As2Se3)100−x(Sb2Se3)x glasses by Raman and 77Se MAS NMR using a multivariate curve resolution approach

Experimental study of the structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and As-Sb-Se by means of NQR and EPR spectroscopy

Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses

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Study of As-Sb-Se chalcogenide glasses by NQR and EPR spectroscopy methods

Abstract: Abstract:In this paper experimental results obtained by both 75 As NQR and EPR spectroscopy are presented for the three-component system As-Sb-Se.

Cited by 3 publications

References 7 publications

Thermoanalytical properties and structure of (As2Se3)100−x(Sb2Se3)x glasses by Raman and 77Se MAS NMR using a multivariate curve resolution approach

Thermoanalytical properties and structure of (As2Se3)100−x(Sb2Se3)x glasses by Raman and 77Se MAS NMR using a multivariate curve resolution approach

Experimental study of the structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and As-Sb-Se by means of NQR and EPR spectroscopy

Study of the EFG tensor at 75As nuclei in Ge‐As‐Se chalcogenide glasses

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Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses