Impact of cobalt ions on the phonon energy and ligand field parameters of some borate glasses

El-Daly, A.A.; Abdo, M.A.; Bakr, H.; Sadeq, M.S.

doi:10.1016/j.jnoncrysol.2020.120535

Cited by 34 publications

(7 citation statements)

References 21 publications

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“…Where 10Dq values increased and B values decreased with the increase in ZnO content. Similar trends were observed in different glass systems doped with Cr [43], Co [44,45], and Ni [46][47][48]. The aforementioned electrostatic field between Cr 3+ ions and their ligands can be employed to describe the increased behavior of 10Dq.…”

Section: Optical Absorption Glass Color and Ligand Field Studiessupporting

confidence: 67%

Influence of ZnO on the structural, optical, ligand field and antibacterial characteristics of sodium borosilicate glasses containing minor Cr₂O₃ additions

et al. 2023

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In this work, the structural, optical, ligand field and antibacterial properties of Cr2O3, ZnO and Na2O borosilicate glasses were studied. A glass system of the compositions 70B2O3-14.8 SiO2-(15-x)Na2O-0.2Cr2O3-xZnO, where x = 0, 3, 5 and 7 mol% were prepared via melt-quenching technique. In this study, X-ray diffraction (XRD) spectra were used to check the amorphous state of the prepared glass specimens. Infrared (IR) spectra were used to study the internal structure of the formed units and groups within the glass matrix. Moreover, the optical absorbance spectra were used to study the optical parameters such as optical band gap (Eg), Urbach energies (EU) and ligand field parameters (10Dq, B, Dq/B and β). Furthermore, the antibacterial activities of the glass samples were investigated against different antibiofilm activities for example, Staphylococcus aureus and Escherichia coli. However, the fixed Cr2O3 concentrations, IR results showed the gradual conversion of Cr3+ cations’ coordination from octahedral (CrO6; glass modifier) to tetrahedral (CrO4; glass former) with more replacement of Na2O by ZnO. This result confirms the significant influence of the environment on Cr cations’ coordination. While the optical studies showed that, Eg values increased from 3.06 to 3.62 with further ZnO doping. Furthermore, 10Dq values increased and B values decreased with the increase in ZnO content. These 10Dq increased values reflect the increased interactions between the Cr3+ cations and their environments, such as oxygen anions. Further, the decreased values of B refer to the tendency of the bonds of Cr3+ cations and their environments toward the covalent nature. On the other hand, the results showed that the investigated glasses are promising materials owing to high antibacterial activity on a large scale (food covering, wound curing, and surface coatings), especially the glass sample that contains the highest concentrations of ZnO. 

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Section: Optical Absorption Glass Color and Ligand Field Studiessupporting

confidence: 67%

Influence of ZnO on the structural, optical, ligand field and antibacterial characteristics of sodium borosilicate glasses containing minor Cr₂O₃ additions

et al. 2023

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“…Actually, Dq 10 and B have an inverse attitude. An analogous demeanor was declared for glass systems possessing Cr [18,22] and Co cations [23,24]. Additionally, from figure 3 (a) and (b), Dq 10 values enhanced whereas B values diminished with additional Cr 3+ substitution.…”

Section: Crystal Field Splitting Parametersupporting

confidence: 59%

“…This behavior is elucidated by the fact that Dq 10 represents the interaction degree amongst Cr 3+ cation and its ligands. In fact, this impact is principally electrostatic, where its value depends on numerous factors; the cations themselves, forms of ligands, interatomic parting, and symmetries of ligand surroundings [19,24]. Actually, the obtained trend for increasing Dq 10 and reducing B denotes Cr 3+ surroundings become a further covalent.…”

Section: Crystal Field Splitting Parametermentioning

confidence: 97%

Impact of Cr³⁺ substitution on the nephelauxetic ratio and Racah parameter of Cr-Mn-Zn nanoferrites

Abdo

Sadeq

2022

Phys. Scr.

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For the first time, we present the ligand field splitting (10Dq) nephelauxetic ratio (β), Racah parameter (B) and stability of Cr3+ within Mn–Zn nanoferrite which synthesized using the citrate route. These parameters were determined via optical absorption spectra. The obtained bands in the significance range of optical absorption spectra are wide as well as asymmetric; therefore the deconvolution process becomes a necessary task. The values of 10Dq and B have been estimated from the produced bands. The values of 10Dq are observed to increase from 16366.61 to 16447.37 cm-1 whereas, B values are observed to decrease from 829.81 to 760.80 cm-1 with additional Cr3+ substitution. The increasing 10Dq and decreasing B values, evidence for bonds between Cr3+ ions with their environments became a further covalent (less ionic). Moreover, the values of β are observed to decrease for further Cr3+ substitution. This decrease of β produces less stability between Cr3+ and its ligand. Furthermore, Dq/B values declare that Cr3+ centers are in the low-field sites by a slight tendency towards the high-field sites with further Cr/Fe substitution process. Therefore, it was suggested that Cr3+ substituted Mn–Zn nanoferrites are excellent candidates for diverse optical applications such as a tunable laser.

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“…Herein, we used s = 1/2 indicating the direct electronic transition. Because of the predominant transitions in glasses are direct or indirect which acquire the absorption of photons near the E g [30]. Variation of (αhν) 2 with (hν) of the prepared Mn-glasses is shown in Figure 5.…”

Section: Density Ftir Analysis and Optical Propertiesmentioning

confidence: 99%

Structural, Optical, Magnetic and Photon Attenuation of Novel Potassium Lead Borate Glasses Doped with MnO

Abouhaswa

Rammah

2022

J Inorg Organomet Polym

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Potassium lead borate glasses doped with MnO (40B 2 O 3 +40PbO+(20-x)K 2 O+xMnO: x= 0-5 mol%) have been prepared via standard melting quenching process. The impact of MnO on the structure, optical, magnetic and gamma-ray protection properties of pottisium lead borate glasses have been examined. The density was increased from 4.83±0.01 to 5.23±0.01 g/cm 3 as MnO content increased. The obtained direct optical gap (E g ) values were 2.84, 2.59, 2.41, 2.19, 1.95, and 1.84 eV for the Mn-x (x=0, 1, 2, 3, 4, and 5) glass samples, respectively. FTIR spectra demonstrated that as the MnO concentration increases in the glass network the intensity and width of the IR bands were increased. The magnetic measurement revealed that the magnetic situation (M s ) was decreased while the magnetic coercivity (H c ) was increased with increasing MnO substitution ratio. The linear attenuation coefficient of the 𝜇 𝑀𝑛−𝑔𝑙𝑎𝑠𝑠 follows the order: µ Mn-0 < µ Mn-1 < µ Mn-2 < µ Mn-3 < µ Mn-4 < µ Mn-5 . Half value layer (HVL) rises as µ decreases and vice versa. The range of the HVL is 0.002 -3.378, 0.002 -3.334, 0.002 -3.291, 0.002 -3.248, 0.002 -3.176, and 0.002 -3.106 cm for 1,2,3,4, and5). The trend of Z eff variation is related to that of both linear and mass attenuation coefficients (µ and µ m ). The produced Mn-glasses can be employed in a variety of optical, magnetic and radiation protective applications.

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Impact of cobalt ions on the phonon energy and ligand field parameters of some borate glasses

Cited by 34 publications

References 21 publications

Influence of ZnO on the structural, optical, ligand field and antibacterial characteristics of sodium borosilicate glasses containing minor Cr₂O₃ additions

Influence of ZnO on the structural, optical, ligand field and antibacterial characteristics of sodium borosilicate glasses containing minor Cr₂O₃ additions

Impact of Cr³⁺ substitution on the nephelauxetic ratio and Racah parameter of Cr-Mn-Zn nanoferrites

Structural, Optical, Magnetic and Photon Attenuation of Novel Potassium Lead Borate Glasses Doped with MnO

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Impact of cobalt ions on the phonon energy and ligand field parameters of some borate glasses

Cited by 34 publications

References 21 publications

Influence of ZnO on the structural, optical, ligand field and antibacterial characteristics of sodium borosilicate glasses containing minor Cr2O3 additions

Influence of ZnO on the structural, optical, ligand field and antibacterial characteristics of sodium borosilicate glasses containing minor Cr2O3 additions

Impact of Cr3+ substitution on the nephelauxetic ratio and Racah parameter of Cr-Mn-Zn nanoferrites

Structural, Optical, Magnetic and Photon Attenuation of Novel Potassium Lead Borate Glasses Doped with MnO

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Influence of ZnO on the structural, optical, ligand field and antibacterial characteristics of sodium borosilicate glasses containing minor Cr₂O₃ additions

Influence of ZnO on the structural, optical, ligand field and antibacterial characteristics of sodium borosilicate glasses containing minor Cr₂O₃ additions

Impact of Cr³⁺ substitution on the nephelauxetic ratio and Racah parameter of Cr-Mn-Zn nanoferrites