Bismuth and lead oxides codoped boron phosphate glasses for Faraday rotators

Sava, Bogdan Alexandru; Boroica, Lucica; Elisa, M.; Shikimaka, O.; Grabco, D.; Popa, Mihai; Barbos, Zinaida; Iordanescu, R.; Niculescu, A.; Kuncser, V.; Gâlcă, A.C.; Eftimie, Mihai; Monteiro, Regina da Conceição Corredeira

doi:10.1016/j.ceramint.2017.12.205

Cited by 28 publications

(4 citation statements)

References 52 publications

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“…The bioglass composition is presented in Table 1. The samples were prepared by an unconventional wet route followed by melting [31,37,38]. As raw materials, the ultra-purity grade reagents boron oxide (B 2 O 3 ), magnesium oxide (MgO,) potassium carbonate (K 2 CO 3 ), phosphoric acid (H 3 PO 4 ), silicon dioxide (SiO 2 ), zinc oxide (ZnO), and cerium oxide (CeO 2 ) have been used.…”

Section: Preparation Of Compositesmentioning

confidence: 99%

“…Boron was shown to promote the formation of amorphous calcium phosphate, which is beneficial for normal metabolism and bone tissue repair; besides, the addition of B 2 O 3 to HA inhibits the thermal decomposition of HA and significantly enhances bending strength and fracture toughness [30]. It was shown as well that B 2 O 3 in the phosphate glass composition increases its hardness and fracture toughness [31]. The doping of bioglasses with Zn and Ce has two effects.…”

Section: Introductionmentioning

confidence: 99%

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Hydroxyapatite–bioglass nanocomposites: Structural, mechanical, and biological aspects

Shikimaka

Bivol

Sava

et al. 2022

Beilstein J. Nanotechnol.

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This research work focuses on the fabrication and study of a series of nanocomposites consisting of two types of hydroxyapatite (HA), obtained by precipitate (HAP) and sol–gel (HAG) methods, and a boro-silico-phosphate bioglass. The microstructure and chemical, mechanical, and biological properties as functions of three factors, namely (i) the type of hydroxyapatite, (ii) glass content, and (iii) sintering temperature, were investigated. It was found that all of these factors affect the final composition and microstructure, especially, porosity, which shows significantly lower values for HAP-based composites than for HAG-based ones and higher values for higher glass content. This, in turn, has an impact on the microhardness, which exhibits a strong correlation with porosity, as well as on the mineralization capability and cell viability due to the different dissolution rate.

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Section: Preparation Of Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite–bioglass nanocomposites: Structural, mechanical, and biological aspects

Shikimaka

Bivol

Sava

et al. 2022

Beilstein J. Nanotechnol.

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“…It is worth mentioning the previous results of the authors related to magnetic and magneto-optical properties of Dy 3+ /Tb 3+ /La 3+ alumina-phosphate vitreous systems applied as bulk Faraday rotators [ 9 , 10 , 11 ] as well as to the rare-earth-doped silico-phosphate sol–gel thin films for magneto-optical applications [ 12 ]. A very recent work of the authors also referred to thermal, structural, mechanical, magnetic and magneto-optical properties of Bi 2 O 3 and PbO-doped boron-phosphate glasses [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

et al. 2020

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This work investigates the structural, magnetic and magneto-optical properties of a new zinc phosphate-tellurite glass belonging to the 45ZnO-10Al2O3-40P2O5-5TeO2 system. The glass was prepared by a wet method of processing the starting reagents followed by suitable melting–stirring–quenching–annealing steps. Specific parameters such as density, average molecular mass, molar volume, oxygen packaging density, refractive index, molar refractivity, electronic polarizability, reflection loss, optical transmission, band gap and optical basicity have been reported together with thermal, magnetic and magneto-optical characteristics. Absorption bands appear in the blue and red visible region, while over 600 nm the glass becomes more transparent. FTIR and Raman spectra evidenced phosphate-tellurite vibration modes proving the P2O5 and TeO2 network forming role. Magnetic measurements reveal the diamagnetic character of the Te-doped glass with an additional weak ferromagnetic signal, specific to diluted ferromagnetic oxides. Positive Faraday rotation angle with monotonous decreasing value at increasing wavelength was evidenced from magneto-optical measurements. The final product is a composite material comprising of a non-crystalline vitreous phase and Te-based nanoclusters accompanied by oxygen vacancies. The metallic-like Te colloids are responsible for the dark reddish color of the glass whereas the accompanying oxygen vacancies might be responsible for the weak ferromagnetic signal persisting up to room temperature.

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“…Increased values of hardness, Young’s modulus and fracture toughness of Bi, Pb-doped borophosphate glasses were reported [ 8 ] in comparison with the un-doped phosphate glasses [ 9 ] and rare-earth-doped phosphate glasses [ 10 ], due to the mixed glass former role of P 2 O 5 and B 2 O 3 components, which contribute to structural strengthening. The deformation of phosphate glasses under different load (strain) rates depends on the evolution of four mechanisms, namely, elastic deformation, densification, shear flow and fracture [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Investigations Regarding the Addition of ZnO and Li2O-TiO2 to Phosphate-Tellurite Glasses: Structural, Chemical, and Mechanical Properties

Elisa

Iordache

et al. 2022

Materials

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Phosphate and tellurite glasses can be used in optics, optoelectronics, magneto-optics, and nuclear and medical fields. Two series of phosphate-tellurite glasses, (50-x)ZnO-10Al2O3-40P2O5-xTeO2 and (40-x)Li2O-10Al2O3-5TiO2-45P2O5-xTeO2 (x = 5, 10), were synthesized by a non-conventional wet-route, and the mechanical properties as key performance measures for their application in optoelectronics were investigated. X-ray Diffraction (XRD) measurements revealed the vitreous nature of the investigated materials. Instrumented indentation tests allowed the calculation of hardness (H) and Young’s modulus (E) using the Oliver and Pharr model. The influence of increasing the TeO2 content, as well as the substitution of ZnO by Li2O-TiO2, on the variation of hardness, Young’s modulus, penetration depth (PD), and fracture toughness (FT) was evaluated in both series. As a general trend, there is a decrease in the hardness and Young’s modulus with increasing penetration depth. The addition of Li2O and TiO2 instead of ZnO leads to improved hardness and elastic modulus values. Regarding the H/E ratio, it was found that the samples with lower TeO2 content should be significantly more crack-resistant compared to the higher TeO2 content samples. The H3/E2 ratio, being lower than 0.01, revealed a poor resistance of these glasses to plastic deformation. At the same time, a decrease of the fracture toughness with increasing TeO2 content was noticed for each glass series. Based on dilatometry measurements, the thermal expansion coefficient as well as the characteristic temperatures of the glasses were measured. Field Emission Scanning Electron Microscopy-Energy Dispersive X-ray analysis (FESEM-EDX) revealed a uniform distribution of the elements in the bulk samples. The mechanical properties of these vitreous materials are important in relation to their application as magneto-optical Faraday rotators in laser cavities.

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Bismuth and lead oxides codoped boron phosphate glasses for Faraday rotators

Cited by 28 publications

References 52 publications

Hydroxyapatite–bioglass nanocomposites: Structural, mechanical, and biological aspects

Hydroxyapatite–bioglass nanocomposites: Structural, mechanical, and biological aspects

A New Zinc Phosphate-Tellurite Glass for Magneto-Optical Applications

Investigations Regarding the Addition of ZnO and Li2O-TiO2 to Phosphate-Tellurite Glasses: Structural, Chemical, and Mechanical Properties

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