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Article

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

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Optospintronics Department, National Institute of R & D for Optoelectronics INOE 2000, 077125 Magurele, Romania
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Materials Science and Engineering Faculty, Transilvania University of Brasov, 500036 Brasov, Romania
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Electrical Engineering and Computer Science Faculty, Transilvania University of Brasov, 500036 Brasov, Romania
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Academy of Romanian Scientists, 050044 Bucharest, Romania
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Technical Sciences Academy of Romania, 030167 Bucharest, Romania
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Laser Department, National Institute for Lasers, Plasma and Radiation Physics, 077125 Magurele, Romania
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Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 060042 Bucharest, Romania
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Multifunctional Materials and Structures Laboratory, National Institute of Materials Physics, 077125 Magurele, Romania
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Authors to whom correspondence should be addressed.
Academic Editor: Philippe Colomban
Materials 2022, 15(5), 1644; https://doi.org/10.3390/ma15051644
Received: 28 January 2022 / Revised: 19 February 2022 / Accepted: 20 February 2022 / Published: 22 February 2022
(This article belongs to the Special Issue Collection of Papers in Material Science from Romania)
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. View Full-Text
Keywords: mechanical properties; phosphate glass; scanning electron microscopy; tellurite glass; thermal expansion coefficient mechanical properties; phosphate glass; scanning electron microscopy; tellurite glass; thermal expansion coefficient
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MDPI and ACS Style

Elisa, M.; Iordache, S.-M.; Iordache, A.-M.; Stefan, C.R.; Vasiliu, I.C.; Cristea, D.; Ursutiu, D.; Samoila, C.; Sava, B.A.; Boroica, L.; Dinca, M.C.; Filip, A.V.; Eftimie, M.; Enculescu, M. Investigations Regarding the Addition of ZnO and Li2O-TiO2 to Phosphate-Tellurite Glasses: Structural, Chemical, and Mechanical Properties. Materials 2022, 15, 1644. https://doi.org/10.3390/ma15051644

AMA Style

Elisa M, Iordache S-M, Iordache A-M, Stefan CR, Vasiliu IC, Cristea D, Ursutiu D, Samoila C, Sava BA, Boroica L, Dinca MC, Filip AV, Eftimie M, Enculescu M. Investigations Regarding the Addition of ZnO and Li2O-TiO2 to Phosphate-Tellurite Glasses: Structural, Chemical, and Mechanical Properties. Materials. 2022; 15(5):1644. https://doi.org/10.3390/ma15051644

Chicago/Turabian Style

Elisa, Mihail, Stefan-Marian Iordache, Ana-Maria Iordache, Constantina Raluca Stefan, Ileana Cristina Vasiliu, Daniel Cristea, Doru Ursutiu, Cornel Samoila, Bogdan Alexandru Sava, Lucica Boroica, Marius Catalin Dinca, Ana Violeta Filip, Mihai Eftimie, and Monica Enculescu. 2022. "Investigations Regarding the Addition of ZnO and Li2O-TiO2 to Phosphate-Tellurite Glasses: Structural, Chemical, and Mechanical Properties" Materials 15, no. 5: 1644. https://doi.org/10.3390/ma15051644

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