Investigation of Spectral Properties of Potassium Aluminoborate Glasses Doped with Chromium

Agafonova, D. A.; Бабкина, А. Н.; Zyryanova, Ksenia; Ignatiev, Alexander; Никоноров, Н. В.; Орешкина, К. В.

doi:10.1134/s1063783419050032

Cited by 1 publication

(3 citation statements)

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“…The shape of the 23 Na NMR spectra was heterogeneously broadened (not shown), which may be associated with the presence of a quadrupole interaction. In general, the maximum of the line shifted toward the positive values of the chemical shift, while the width of the resonant line decreased with an increase in the duration of heat treatment.…”

Section: Nmr Resultsmentioning

confidence: 98%

“…The rotor was spinning at a frequency of 12.5 kHz at a magical angle to a constant magnetic field. Studies were carried out on the 11 B, 23 Na, and 29 Si nuclei. H 3 BO 3 , NaCl solution in H 2 O, and (CH 3 ) 4 Si were used as the external reference, respectively.…”

Section: Solid-state Nuclear Magnetic Resonance (Nmr)mentioning

confidence: 99%

“…The valence state of chromium ions determines the properties of such glasses, such as luminescence [ 11 , 12 , 13 , 14 ], semiconducting behavior [ 15 ], and magnetic properties [ 16 ]. These properties make it possible to consider glasses containing chromium as promising materials for use in various modern fields, such as laser technology, optoelectronic devices, and solar power engineering [ 9 ], in the tunable solid-state lasers that are used in telecommunication systems [ 17 , 18 , 19 , 20 ], electro-optical modulators, nonlinear optical and parametric converters, fiber optical amplifiers [ 21 , 22 ], for innovative luminescent resources [ 17 ], and in luminescent solar concentrators [ 23 , 24 , 25 ]. In addition, materials containing chromium ions have recently attracted interest as cathodes in storage batteries, due to their high energy density and high capacity [ 17 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Crystallization of Cristobalite in Sodium Borosilicate Glass in the Presence of Cr2O3

et al. 2023

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Glass containing chromium is a promising material for use in various modern fields of application (laser technology, optoelectronic devices, and luminescent resources). Chromium oxides are well-known nucleating agents that can cause crystallization. One of the most commonly observed crystalline phases in silicate glasses is cristobalite, which lowers their mechanical strength, leading to the destruction of the material. The objective of this investigation was to study in detail the crystallization of cristobalite in sodium borosilicate glass in the presence of 2 mol% Cr2O3, depending on the thermal history of the glass. The glass was studied using XRD, SEM, EPR, FTIR-spectroscopy, XPS, and solid-state NMR. Eskolaite, α-Cr2O3, which had crystallized in this glass, stimulated the bulk crystallization of cristobalite at 550 °C after isothermally treating it for 72 h, due to the phase-separated structure of the glass with its interpenetrating phase morphology. Polytypism, resulting in the incorporation of alkalis into the cristobalite structure, was observed. Cr2O3 causes the catalytic crystallization of cristobalite at an extremely low temperature, which is at lower concentrations and temperatures than in glass containing Fe2O3 with a similar composition. The crystal growth rate and the incubation time for the crystallization of cristobalite were roughly estimated.

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Section: Nmr Resultsmentioning

confidence: 98%

Section: Solid-state Nuclear Magnetic Resonance (Nmr)mentioning

confidence: 99%