ChemInform Abstract: IR‐SPECTRAL INVESTIGATION OF THE STRUCTURE OF GLASSES IN THE IRON(III) OXIDE‐VANADIUM(V) OXIDE SYSTEM

Dimitrov, V.; Dimitriev, Y.; Mihailova, V.

doi:10.1002/chin.198343008

Cited by 3 publications

(15 citation statements)

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“…This wavelength range is characterized by the asymmetric stretching vibration ν d as (F) of Si-O-Si bonds in SiO 4 tetrahedra. 35,36,38 In the present study, the position of the most intensive band (for samples containing Fe 2 O 3 ) is centered at about 990-951 cm −1 with a slight shoulder at about 1195-1158 cm −1 . This is an indication that the amount of Q 2 species in our case is larger than that of Q 3 and Q 4 .…”

Section: Ftir Spectroscopysupporting

confidence: 53%

“…35,36 It is found that while increasing the degree of linkage of tetrahedra in the order ortho-, pyro-, meta-to disilicates, the position of this band is shifted toward higher wave numbers. 35 Bäck et al 36 have investigated the Q n distribution in mixed alkali and alkaline earth silica glasses in the 20R 2 O-10CaO-70SiO 2 (R = Na and/or K) and 20Na 2 O/10MO/70SiO 2 (M = Ca and/or Ba) systems by infra-red and Raman spectroscopy. They have deconvoluted the Raman envelope from about 850-1250 cm −1 , considering the increasing degree of polymerization, as follows: Q 21 : 946 cm −1 ; Q 22 : 1017 cm −1 ; Q 32 : 1060 cm −1 ; Q 33 : 1102 cm −1 ; Q 43 : 1147 cm −1 ; and Q 44 : 1195 cm −1 , where Q mn indicates a Q m unit connected to a Q n unit.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…V m gives information about the free volume in the glass structure while the OPD is an indication of the cross-linkage of the network. 35,36 The obtained results of both parameters for the (100-x)(0.16Na 2 O/0.10CaO/0.74SiO 2 )/xFe 2 O 3 system are shown in Table 1. V m is in the 24.18 -27.74 cm 3 •mol −1 range and the OPD of the glasses-in the 70.97-74.50 mol/cm 3 range.…”

Section: Density Molar Volume and Oxygen Packing Densitymentioning

confidence: 99%

“…35 Based on numerous investigations of silicate materials, it is proven that the asymmetric stretching vibration ν d as (F) is the most sensitive band to the degree of polymerization of the silicate network. 35,36 It is found that while increasing the degree of linkage of tetrahedra in the order ortho-, pyro-, meta-to disilicates, the position of this band is shifted toward higher wave numbers. 35 Bäck et al 36 have investigated the Q n distribution in mixed alkali and alkaline earth silica glasses in the 20R 2 O-10CaO-70SiO 2 (R = Na and/or K) and 20Na 2 O/10MO/70SiO 2 (M = Ca and/or Ba) systems by infra-red and Raman spectroscopy.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

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Structure and redox ratio of soda‐lime‐silica glasses with high iron oxide concentrations

Tasheva

Harizanova

Mihailova

et al. 2023

Int J of Appl Glass Sci

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The high temperature synthesis of glasses in the system (100‐x)(0.16Na2O/0.10CaO/0.74SiO2)/xFe2O3, x = 5 ÷ 20 mol% is reported. For Fe2O3 concentrations ≤15 mol%, glasses are formed while the sample with 20 mol% crystallizes during cooling the melt. X‐ray diffraction shows the crystallization of magnetite. The microstructure of the glass‐crystalline sample is investigated by optical microscopy and scanning electron microscopy and two types of iron‐rich crystals corresponding to magnetite and hematite are detected. The refractive indices as determined by the Becke line method are in the 1.567 ‐ 1.639 range and. increase with increasing Fe2O3 concentration. The structure is characterized using Infra‐red spectroscopy. The presence of symmetric stretching, asymmetric stretching and bending vibrations of Si‐O‐Si is detected and attributed to the occurrence of SiO4 tetrahedral units with varying numbers of nonbridging oxygens. Also, the increasing Fe2O3 concentration results in occurrence of Fe‐O‐Si bonds indicating the glass network depolymerization due to Fe2O3 addition. In all samples, the presence of Fe3+ and Fe2+ and the existence of iron ions in tetrahedral and octahedral coordination, as well as a very small amount of Fe0 and the precipitation of hematite and magnetite in the glass‐crystalline sample is revealed by Mössbauer spectroscopy.

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Section: Ftir Spectroscopysupporting

confidence: 53%

Section: Ftir Spectroscopymentioning

confidence: 99%

Section: Density Molar Volume and Oxygen Packing Densitymentioning

confidence: 99%

Section: Ftir Spectroscopymentioning

confidence: 99%

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Structure and redox ratio of soda‐lime‐silica glasses with high iron oxide concentrations

Tasheva

Harizanova

Mihailova

et al. 2023

Int J of Appl Glass Sci

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“…The object of our investigation is the V 2 O 5 -MoO 3 -ZnO system. Binary MoO 3 -V 2 O 5 glasses are obtained between 0-90 mol % MoO 3 with MoO 6 and VO 5 as main structural units [9]. In the ZnO-V 2 O 5 system, glasses are prepared between 33.3 -100 mol % V 2 O 5 [10].…”

Section: Introductionmentioning

confidence: 99%

Glass formation in the V₂O₅‐MoO₃‐ZnO system

Markova-Velichkova

Iordanova

Dimitriev

2011

Phys. Status Solidi C

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Glass formation region in the V2O5‐MoO3‐ZnO system was determined using low cooling rates (102 K/s). The glasses were obtained in the central part of the system from compositions containing 10‐65 mol% V2O5, 10‐65 mol% MoO3 and 10‐50 mol% ZnO. The amorphous and crystalline phases were characterized by x‐ray diffraction (XRD), differential thermal analysis (DTA) and infra‐red spectroscopy (IR). According to DTA data the glass compositions with molar ratio of the components near to 1:1:1 are more stable against crystallization. Structural models for V2O5‐MoO3‐ZnO glasses were suggested on the basis of IR spectral investigation, and by comparing with the data of known crystalline structures. It was established that VO5 groups associated in layers or chains, isolated V2O7 pyrovanadate units and MoO6 groups are the main structural units creating amorphous networks. ZnO depolymerizes vanadate and molybdate amorphous networks (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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IR-spectroscopy, thermophysical and mechanical properties of glasses in the system Na2O/BaO/TiO2/B2O3/SiO2/Al2O3

Harizanova,

Gaydarov,

Gugov

et al. 2023

JCTM

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Glasses with the compositions (23.1-x)Na 2 O/23.1BaO/23TiO 2 /9.8B 2 O 3 /21SiO 2 /xAl 2 O 3 x = 3, 7, 11 and 15 mol% were melted using a traditional melt-quenching technique. The thermophysical properties of the obtained glasses, i.e., glass transition temperature, T g , and crystallization peak maximum temperature, T c , were determined by differential scanning calorimetry and showed that the increasing alumina concentration leads to an increase of both the T g and T c values, while the difference T g -T c , used as a glass stability criterium, changes in the opposite manner, being highest for the glass with 3 mol % Al 2 O 3 and smallest for the composition with 15 mol % Al 2 O 3 . The structure of the prepared series of glasses was studied by infrared spectroscopy and showed that the main structural units present are isolated and interconnected SiO 4 tetrahedra. Both BO 4 and BO 3 structural units, which number initially increases with the increasing alumina concentration and then starts to decrease, are also present. The conducted depth-sensing indentation on the obtained glasses allowed to determine mechanical properties such as universal (HMV) and indentation (Hit) hardness, elastic modulus and elastic part of indentation work. The change of the Na 2 O/Al 2 O 3 ratio resulted in increasing HMV and H it up to 11 mol% Al 2 O 3 and then a slight decrease of the respective parameters was observed.

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ChemInform Abstract: IR‐SPECTRAL INVESTIGATION OF THE STRUCTURE OF GLASSES IN THE IRON(III) OXIDE‐VANADIUM(V) OXIDE SYSTEM

Abstract: Die IR‐Spektren von Gläsern des Titelsystems mit 0‐50 mol‐% Fe,O3 sind durch 2 Banden gekennzeichnet, die die durch F e2O3‐Zusatz begünstigte Umwandlung der VO5‐ in VO4‐Gruppen widerspiegeln.

Cited by 3 publications

References 1 publication

Structure and redox ratio of soda‐lime‐silica glasses with high iron oxide concentrations

Structure and redox ratio of soda‐lime‐silica glasses with high iron oxide concentrations

Glass formation in the V₂O₅‐MoO₃‐ZnO system

IR-spectroscopy, thermophysical and mechanical properties of glasses in the system Na<sub>2</sub>O/BaO/TiO<sub>2</sub>/B<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>

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ChemInform Abstract: IR‐SPECTRAL INVESTIGATION OF THE STRUCTURE OF GLASSES IN THE IRON(III) OXIDE‐VANADIUM(V) OXIDE SYSTEM

Abstract: Die IR‐Spektren von Gläsern des Titelsystems mit 0‐50 mol‐% Fe,O3 sind durch 2 Banden gekennzeichnet, die die durch F e2O3‐Zusatz begünstigte Umwandlung der VO5‐ in VO4‐Gruppen widerspiegeln.

Cited by 3 publications

References 1 publication

Structure and redox ratio of soda‐lime‐silica glasses with high iron oxide concentrations

Structure and redox ratio of soda‐lime‐silica glasses with high iron oxide concentrations

Glass formation in the V2O5‐MoO3‐ZnO system

IR-spectroscopy, thermophysical and mechanical properties of glasses in the system Na<sub>2</sub>O/BaO/TiO<sub>2</sub>/B<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>

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Glass formation in the V₂O₅‐MoO₃‐ZnO system