Use of Fe3+ ion probe to study the structural coordination in sodium–lead borophosphate glasses by utilizing electron paramagnetic resonance and optical spectroscopy

Srinivasulu, K.; Omkaram, I.; Obeid, H.; Kumar, Amit; Rao, J.L.

doi:10.1016/j.jallcom.2012.08.054

Cited by 21 publications

(4 citation statements)

References 53 publications

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“…ESR measurements give direct evidence of the paramagnetic color centers in glasses. The ESR intensity of Fe 3+ (g-value around at 4.3) [31] shows an order of 3ω, 2ω and 1ω glass, which is in agreement with the changes of the UV absorption edge as shown in Figures 14 and 15. The signals of PO 3 -EC, PO 4 -EC, POHC defects become apparent after doping with iron or cobalt ions, indicating that cobalt and iron contribute to form these defects.…”

Section: Influence Of Iron and Cobalt On The Defect-state Of Phosphatsupporting

confidence: 86%

The Nature of the Defects in Phosphate-Based Glasses Induced by Gamma Radiation

He¹,

Wang²,

Lü³

et al. 2018

Advances in Glass Science and Technology

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Final optics assembly is one of the most important parts in high energy and large-scale laser systems like US National Ignition Facility and SG III in China. Those final optics assembly are facing some severe tests, like the laser-induced damage caused by 3ω (351 nm) laser irradiation. Meanwhile, the irradiation of gamma ray and X-rays, will also cause the changes of optical properties in the investigated multi-component phosphate glasses that have potential use in novel color separation optics in high power laser facilities. These changes of optical properties are associated with the defects induced by gamma radiation. In details, some defects contribute to the absorption in the UV region, which will deteriorate their UV performance. However, some of the induced defects can be eliminated by thermal treatment due to the release and capture of the electrons in conduction band. Besides, the doped Fe, Co, B, Ce and Sb will also affect the defect-state in phosphate-based glasses. In details, gamma radiation resistances of the phosphate glass can be greatly improved by CeO 2 and Sb 2 O 3 co-doping, and the introduction of B 2 O 3 reduces the connectivity of phosphate chains and thus increases the concentration of PO 3-EC and PO 4-EC defects.

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Section: Influence Of Iron and Cobalt On The Defect-state Of Phosphatsupporting

confidence: 86%

The Nature of the Defects in Phosphate-Based Glasses Induced by Gamma Radiation

He¹,

Wang²,

Lü³

et al. 2018

Advances in Glass Science and Technology

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“…This is because Fe 2+ does not produce any signals in the EPR. 47,50,51 In addition, the extremely large resonance at g = 2.00 of R-FSPC validated the existence of a copious amount of vacancies and nanopores in this sample compared with those in the FSPC powders. 38,52,53 Further, X-ray photoelectron spectroscopy (XPS) was employed to track the electronic states of Fe, Si, and P in the FSPC and R-FSPC hybrids.…”

Section: Resultsmentioning

confidence: 58%

“…The mass-normalized spectrum of FSPC exhibited several superimposed resonances at g = 1.79, 2.00, 2.61, 3.11, and 4.32 (acquired from eq ), thereby proving the existence of abundant Fe 3+ cations. − However, the R-FSPC hybrid emanated weak EPR signals at g = 2.00 and 2.13 and a minor asymmetric resonance at g = 4.33, which indicated the presence of a few Fe 3+ ions. This is because Fe 2+ does not produce any signals in the EPR. ,, In addition, the extremely large resonance at g = 2.00 of R-FSPC validated the existence of a copious amount of vacancies and nanopores in this sample compared with those in the FSPC powders. ,, …”

Section: Resultsmentioning

confidence: 72%

Fe³⁺-Derived Boosted Charge Transfer in an FeSi₄P₄ Anode for Ultradurable Li-Ion Batteries

2022

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Ion and electron transportation determine the electrochemical performance of anodes in metal-ion batteries. This study demonstrates the advantage of charge transfer over mass transport in ensuring ultrastable electrochemical performance. Additionally, charge transfer governs the quality, composition, and morphology of a solid–electrolyte interphase (SEI) film. We develop FeSi4P4-carbon nanotube (FSPC) and reduced-FeSi4P4-carbon nanotube (R-FSPC) heterostructures. The FSPC contains abundant Fe3+ cations and negligible pore contents, whereas R-FSPC predominantly comprises Fe2+ and an abundance of nanopores and vacancies. The copious amount of Fe3+ ions in FSPC significantly improves charge transfer during Li-ion battery tests and leads to the formation of a thin monotonic SEI film. This prevents the formation of detrimental LiP and crystalline-Li3.75Si phases and the aggregation of discharging/recharging products and guarantees the reformation of FeSi4P4 nanocrystals during delithiation. Thus, FSPC delivers a high initial Coulombic efficiency (>90%), exceptional rate capability (616 mAh g–1 at 15 A g–1), and ultrastable symmetric/asymmetric cycling performance (>1000 cycles at ultrahigh current densities). This study deepens our understanding of the effects of electron transport on regulating the structural and electrochemical properties of electrode materials in high-performance batteries.

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“…The usual X-band EPR signals of Fe 3+ are observed at g ≈ 4.2-4.3, g ≈ 2.2, and g ≈ 2.0 (Kim et al, 2010). Although alternative interpretations exist in the literature for the assignments of these EPR signals, the commonly accepted assignments are as follows: framework iron in a tetrahedral environment and iron oxide species and iron ions coupled by exchange interactions in a distorted octahedral environment, respectively (Srinivasulu et al, 2013;Weckhuysen et al, 2004). Fig.…”

Section: Spectroscopic Characterization Of the Depositsmentioning

confidence: 99%

Experimental modeling of silicate-based geothermal deposits

et al. 2017

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Scaling by metal silicates represents a major obstacle for geothermal systems. A composition that enables the fabrication of artificial deposits is necessary for the rapid testing of potential inhibitors. In this work, artificial deposits were synthesized by employing experimental conditions similar to those in the Tuzla Geothermal Field in Turkey. Although refluxing enabled the formation of a precipitate that was similar to naturally formed deposits in color and texture, their elemental composition and morphology showed a mismatch. An autoclave enabled the production of a precipitate that more closely resembled naturally formed deposits in color, texture, elemental composition, and structure.Test experiments were carried out at ionic strengths of 0.01 and 0.24 molal (m), pH values ranging from 3 to 11, and initial concentrations of silica of 250, 750, and 1250 ppm. The results showed that silica

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Use of Fe3+ ion probe to study the structural coordination in sodium–lead borophosphate glasses by utilizing electron paramagnetic resonance and optical spectroscopy

Cited by 21 publications

References 53 publications

The Nature of the Defects in Phosphate-Based Glasses Induced by Gamma Radiation

The Nature of the Defects in Phosphate-Based Glasses Induced by Gamma Radiation

Fe³⁺-Derived Boosted Charge Transfer in an FeSi₄P₄ Anode for Ultradurable Li-Ion Batteries

Experimental modeling of silicate-based geothermal deposits

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Use of Fe3+ ion probe to study the structural coordination in sodium–lead borophosphate glasses by utilizing electron paramagnetic resonance and optical spectroscopy

Cited by 21 publications

References 53 publications

The Nature of the Defects in Phosphate-Based Glasses Induced by Gamma Radiation

The Nature of the Defects in Phosphate-Based Glasses Induced by Gamma Radiation

Fe3+-Derived Boosted Charge Transfer in an FeSi4P4 Anode for Ultradurable Li-Ion Batteries

Experimental modeling of silicate-based geothermal deposits

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Product

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Fe³⁺-Derived Boosted Charge Transfer in an FeSi₄P₄ Anode for Ultradurable Li-Ion Batteries