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. 2020 Sep 18;10(9):1875.
doi: 10.3390/nano10091875.

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

Mihail Elisa  1 , Raluca Constantina Stefan  1 , Ileana Cristina Vasiliu  1 , Stefan Marian Iordache  1 , Ana-Maria Iordache  1 , Bogdan Alexandru Sava  2 , Lucica Boroica  2 , Marius Catalin Dinca  2 , Ana Violeta Filip  2 , Aurelian Catalin Galca  3 , Cristina Bartha  3 , Nicusor Iacob  3 , Madalin Ion Rusu  1 , Mihai Eftimie  4 , Victor Kuncser  3
Affiliations

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

Mihail Elisa et al. Nanomaterials (Basel). .

Abstract

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.

Keywords: diluted ferromagnetism; glass; magneto-optical functionalities; optical spectroscopies.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses or interpretation of data; in the writing of the manuscript or in the decision to publish the results.

Figures

Figure 1
Figure 1
XRD pattern of Te-5 glass.
Figure 2
Figure 2
(a) The optical absorption of the Te-5 glass sample (inset-planar glass sample image) and (b) the graphical determination of the energy band gap, Eg.
Figure 3
Figure 3
(a) Variation of (α/λ)0.5 with 1/λ; and(b) Urbach plot for Te-5 glass.
Figure 4
Figure 4
The refractive index versus wavelength for the Te-5 glass.
Figure 5
Figure 5
(a) Differential Scanning Calorimetry (DSC) thermal scan of the Te-5 glass sample and (b) the dilatometric thermal expansion plot of the Te-5 glass.
Figure 6
Figure 6
FTIR spectrum of the Te-5 glass sample.
Figure 7
Figure 7
Raman spectrum of the Te-5 glass sample.
Figure 8
Figure 8
Magnetization data vs. the applied field at 2 different temperatures (a) with the inset presenting the dependence of magnetization vs. temperature in a field of 3,000 Oe and hysteresis loops at 10 K, 30 K and 50 K (b) and at higher temperatures up to 300 K (c).
Figure 9
Figure 9
(a) Faraday rotation angle vs. wavelength (under B = 0.2 T) and (b) Verdet constant vs. wavelength for Te-5 glass sample (under B = 0.2 T).
See this image and copyright information in PMC

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