Influence of Bi2O3 on thermal, structural and dielectric properties of lithium zinc bismuth borate glasses

Rani, Saroj; Sanghi, Sujata; Ahlawat, Neetu; Agarwal, Ashish

doi:10.1016/j.jallcom.2014.01.211

Cited by 103 publications

(40 citation statements)

References 47 publications

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“…From the FTIR spectra of the P40B20 glass with 20 mol% B2O3 content, there were two bands that were not observed in the IR spectra of the other glass formulations. According to the IR assignments in Table 2: Peak assignments for the Infrared analysis., the new presented bands for this glass at 680 cm -1 and 1430 cm -1 were assigned to B-O-B bending vibration and B-O stretch vibration in the BO3 units, respectively [49,50]. Furthermore, the peak shifts at bands 940 and 1040 cm -1 were observed as B2O3 content increased from 15% to 20%.…”

Section: Discussionmentioning

confidence: 71%

“…Furthermore, the peak shifts at bands 940 and 1040 cm -1 were observed as B2O3 content increased from 15% to 20%. This indicated that the content of Q 2 metaphosphate groups were reduced continuously, and also suggested that more BO3 and BO4 units had formed in the system, such as pyro borate groups (BO3) and diborate, triborate and pentaborate groups (BO4) [49][50][51][52]. In other words, a broad peak at band 840 cm -1 with B2O3 reaching 20 mol%, suggested that the borate units (BO4) linked with PO4 units by sharing the negative charge supplied by the oxygen of the modifier to form BPO4 units [33,46,61].…”

Section: Discussionmentioning

confidence: 95%

“…These peak variations were suggested to be due to the decrease in P2O5 content leading to a depolymerisation of Q 2 metaphosphate groups and thus a decrease in symmetric linkages of P-O-P in Q 2 [19,45,47]. In addition, B-O stretch vibration in BO4 units was assigned to a band at 1040cm -1 where the shift to a higher wavenumber of 1050 cm -1 was suggested to be due to the increase of B2O3 leading to more BO4 tetrahedral units and the formation of borate groups, such as triborate and tetraborate [33,50]. A minor peak shift in this band was also indicative of the content of BO3 units which increased due to the addition of B2O3 [51][52][53].…”

Section: Discussionmentioning

confidence: 99%

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Structural, thermal, in vitro degradation and cytocompatibility properties of P2O5-B2O3-CaO-MgO-Na2O-Fe2O3 glasses

Zhu

Ahmed

Parsons

et al. 2017

Journal of Non-Crystalline Solids

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Borophosphate glasses with compositions of (48-x)P2O5-(12+x)B2O3-14CaO-20MgO-1Na2O-5Fe2O3 (where x=0, 3, 8 mol%) were prepared via a melt-quenching process. The effects of replacing P2O5 with B2O3 on the structural, thermal, degradation properties and cytocompatibility were investigated. Fourier Transform Infrared (FTIR) spectroscopy analysis confirmed the existence of BO3 triangular units and BO4 tetrahedral units within all the glasses with an increase of B/P ratio from 0.25 to 0.5. The BO4 units within the glass structure were observed to cause an increase in density (ρ) as well as glass transition (Tg) temperature and to decrease the crystallisation temperature (Tc). A decrease in thermal stability which indicated by process window was also observed in the case of substitution of P2O5 with B2O3. Degradation analysis of the glasses indicated that the dissolution rate increased with the addition of B2O3. The decrease in the thermal stability and chemical durability were attributed to the increase of BO3 units, which could increase crystallisation tendency and be easily hydrolysed by solution. The effect of boron addition on the cytocompatibility of the glasses was analysed using Alamar Blue and Alkaline Phosphatase (ALP) assays and DNA quantification. MG63 osteosarcoma cells cultured in direct contact with the glass samples surface for 14 days showed better cytocompatibility, compared to the Tissue Culture Plastic (TCP) control group. In summary, the glass formulation with 12 mol% B2O3 presented the best cytocompatibility and thermal stability, thus could be considered for continuous fibre fabrication in future research and downstream activities.

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Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

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Structural, thermal, in vitro degradation and cytocompatibility properties of P2O5-B2O3-CaO-MgO-Na2O-Fe2O3 glasses

Zhu

Ahmed

Parsons

et al. 2017

Journal of Non-Crystalline Solids

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“…The frequency region around f M shows different relaxation regions i.e., the range of frequencies below f M indicates the range in which the charge carrier ions (Na + here) drift over longer distance and are associated with hopping conduction, while the frequency region above f M represents the region in which the charge carriers are spatially confined to their potential wells. These ions therefore, are free to move within the wells due to the relaxation polarization process [67]. Hence, the peak frequency f M is an indication of transition from long to short range mobility.…”

Section: Electric Modulusmentioning

confidence: 99%

Compositional dependence of properties in calcium substituted sodium borophosphate glasses containing $${\hbox {VO}}^{2+}$$ VO 2 + ions

et al. 2019

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Synthesis of calcium-substituted sodium borophosphate glasses with compositions xCaO − (30 − x)Na 2 O − 35B 2 O 3 − 35P 2 O 5 (x = 0, 2, 5, 7 and 10 mol%, abbreviated as CNVx) containing additional 1.0 mol% of V 2 O 5 following a melt-quench method has been carried out. Different analytical techniques viz. wide angle X-ray diffraction (to confirm noncrystalline nature), ultraviolet-visible spectroscopy (for optical band gap analysis), infrared absorption spectroscopy (for structural analysis) and differential thermal analysis (to evaluate characteristic temperatures) were employed to characterize the synthesized compositions. The optical band gap is calculated for both indirect allowed and indirect forbidden transitions. The values of the band gap decrease with increasing concentration of CaO (from 5 to 10 mol%) at the cost of Na 2 O. The cut-off wavelength and Urbach's energy are determined from the optical absorption spectra and were related to the structural changes occurring in these glasses with an increase in CaO content. The results obtained from Fourier-transform infrared studies confirm that V 2 O 5 and CaO play the role of network modifier oxides. Also, the significant shifting in IR bands with an increase in CaO content in the glass matrix suggests the formation of a new boron-oxygen ring. From differential scanning calorimetry measurements it is observed that substitution leads to the increase in natural bond orbitals, high degree cross-linking and thus strengthens the glass network. Glass transition temperature (T g ) is found to increase from 483 to 522 • C. Electrical and dielectric properties are analysed using dc conductivity and impedance spectroscopy. Using impedance spectroscopy, different dielectric parameters i.e. dielectric loss (ε ), electrical modulus (M * ) and ac conductivity (σ ac ) etc. are evaluated as a function of frequency, temperature and composition. The frequency dependence of impedance exhibits the non-Debye relaxation behaviour and the total conductivity obeys Jonscher's power law.

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“…The structure arrangement of nanocrystal-in-glass, for example, not only combines two functional components in one material, but also the covalent link enables us to manipulate the glass structure to change its properties. To the best of our knowledge, some reports have described that incorporating nanocrystalline precipitates within glassy matrices can effectively improve their properties [10][11][12][13][14][15][16][17][18]. Thus selecting a suitable nanocrystal-in-glass system and developing an effective synthetic process for incorporating NCs into glassy matrix becomes very important in the field of materials science.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity in monodisperse In2O3 nanocrystals incorporated into transparent silica glassy matrix

Pei

Liang

Cai

et al. 2015

Journal of Alloys and Compounds

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Influence of Bi2O3 on thermal, structural and dielectric properties of lithium zinc bismuth borate glasses

Cited by 103 publications

References 47 publications

Structural, thermal, in vitro degradation and cytocompatibility properties of P2O5-B2O3-CaO-MgO-Na2O-Fe2O3 glasses

Structural, thermal, in vitro degradation and cytocompatibility properties of P2O5-B2O3-CaO-MgO-Na2O-Fe2O3 glasses

Compositional dependence of properties in calcium substituted sodium borophosphate glasses containing $${\hbox {VO}}^{2+}$$ VO 2 + ions

Photocatalytic activity in monodisperse In2O3 nanocrystals incorporated into transparent silica glassy matrix

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