Photoacoustic studies of xCr2O3(1 − x)[2P2O5·Na2O] glasses

Barbu, A.; Bratu, Ioan; Ardelean, I.; Cozar, O.

doi:10.1016/0022-2860(95)08741-d

Cited by 16 publications

(5 citation statements)

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“…The g value of 2.00 is attributed to the isolated Cr 3+ centers at the axially distorted octahedral sites [ 46 ]. EPR lines with g-factors of around 4.6–4.8 can be assigned to the isolated Cr 3+ centers in the strongly distorted octahedral sites of the glass network [ 3 , 46 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

et al. 2023

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“…For a Cu 2+ (3d 9 ) ion in ideal octahedra, its energy level will be split into 2 E g and 2 T 2g . However, in the tetragonal symmetry the energy levels will be split further, i.e., the lower 2 E g irreducible representation may be separated into two orbital singlets 2 B 1g and 2 A 1g with the former lying lowest, while the upper 2 T 2g representation would split into an orbital singlet 2 B 2g and a doublet 2 E g [11,17].…”

Section: Calculationsmentioning

confidence: 99%

“…However, in the tetragonal symmetry the energy levels will be split further, i.e., the lower 2 E g irreducible representation may be separated into two orbital singlets 2 B 1g and 2 A 1g with the former lying lowest, while the upper 2 T 2g representation would split into an orbital singlet 2 B 2g and a doublet 2 E g [11,17]. In order to study the spin Hamiltonian parameters for the Cu 2+ centers in NP and ZLBN glasses, the high (fourth-) order perturbation formulas of the g factors and the hyperfine structure constants for a tetragonally elongated octahedral 3d 9 cluster can be adopted here [18]:…”

Section: Calculationsmentioning

confidence: 99%

“…E 1 and E 2 are the energy separations between the excited 2 B 2g and 2 E g and the ground 2 B 1g states under tetragonal crystal fields [18,19]. They can be determined from the energy matrices for a 3d 9 ion under tetragonal symmetry in terms of the cubic field parameter Dq and the tetragonal field parameters Ds and Dt:…”

Section: Calculationsmentioning

confidence: 99%

“…Especially, these glasses doped with transition-metal ions show unique optical and electrical [6 -8], photoacoustic [9], and ion conductivity [10]. In general, the above properties or behaviours are sensitive to the local structures and electronic states of the doped transition-metal impurities, which can be analyzed by means of the electron paramagnetic resonance (EPR) technique.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Spin Hamiltonian Parameters and the Local Structures for Cu²⁺ Centers in Sodium Phosphate and Heavy Metal Fluoride Glasses

Zhanga

Wana

Zhang

2012

Zeitschrift Für Naturforschung A

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The spin Hamiltonian parameters (the anisotropic g factors g || , g ⊥ and hyperfine structure constants A || , A ⊥ ) for the Cu 2+ sites in sodium phosphate glasses Na 2 O − 9P 2 O 5 and heavy metal fluoride glasses 60ZrF 4 − 5LaF 3 − 20BaF 2 − 15NaF are theoretically investigated by using the high (fourth-) order perturbation formulas of these parameters for a 3d 9 ion in tetragonally elongated octahedra. In these formulas, the contributions to the g factors from the tetragonal distortion, characterized by the tetragonal field parameters Ds and Dt, are taken into account by considering the relative axial elongation of the ligand octahedron around the Cu 2+ due to the Jahn-Teller effect. According to the calculations, the ligand octahedra around Cu 2+ are suggested to suffer about 12% and 18% relative elongation along the C 4 -axis for the studied Na 2 O − 9P 2 O 5 and 60ZrF 4 − 5LaF 3 − 20BaF 2 − 15NaF glasses, respectively. The local structures characterized by the above axial elongations are discussed.

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Magnetic and spectroscopic properties of PbO–La2O3–P2O5:Cr2O3 glass system

Rao¹,

Babu

Prasad³

2013

Journal of Non-Crystalline Solids

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Photoacoustic studies of xCr2O3(1 − x)[2P2O5·Na2O] glasses

Cited by 16 publications

References 2 publications

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

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

Investigation on the Spin Hamiltonian Parameters and the Local Structures for Cu²⁺ Centers in Sodium Phosphate and Heavy Metal Fluoride Glasses

Magnetic and spectroscopic properties of PbO–La2O3–P2O5:Cr2O3 glass system

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Photoacoustic studies of xCr2O3(1 − x)[2P2O5·Na2O] glasses

Cited by 16 publications

References 2 publications

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

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

Investigation on the Spin Hamiltonian Parameters and the Local Structures for Cu2+ Centers in Sodium Phosphate and Heavy Metal Fluoride Glasses

Magnetic and spectroscopic properties of PbO–La2O3–P2O5:Cr2O3 glass system

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Investigation on the Spin Hamiltonian Parameters and the Local Structures for Cu²⁺ Centers in Sodium Phosphate and Heavy Metal Fluoride Glasses