Abstract
Heavy-metal-oxide (HMO) glasses attract much interest in many applications such as Faraday rotators, current sensors, etc., in the area of magneto-optic effects due to their unique magnetic-optical property, high refractive index and other interesting properties. However, during the melt-quenching process of these glasses, the high corrosive nature of the melt to the crucibles makes the fabrication of HMO glasses complicated and the properties of the obtained glasses show strong dependence on the crucible materials. Literatures reported that the gold and platinum crucibles are not suitable due to their contamination to the melt glasses, ceramic crucible was considered suitable for the melting of HMO glasses. In this work, magnetic-optical glasses within the system of PbO-Bi2O3-B2O3 have been prepared using different kinds of ceramic crucibles for the aim of finding the most suitable crucible for melting HMO glasses. The glass properties in terms of Verdet constant, thermal stability and UV-Vis-IR transmittance in function of different crucibles were studied and reported. It was found that the same batch of glasses prepared under same conditions (melting temperature, melting time and annealing process), but in different ceramic crucibles (coded as C1, C2 and C3) showed significant difference in properties such as glass forming ability, thermal stability, optical absorption in UV-Vis-IR and Verdet constant (0.0812 - 0.1483 min/G.cm). The ceramic crucible made of 25%Al2O3 and 75%SiO2 (C2) was found to be the most suitable for PbO-Bi2O3-B2O3 glass preparation, compared with platinum, gold, C1 and C3. Glasses melted with C2 exhibit good performance in magneto and optical property, as well as good thermal stability.
Highlights
Studies on the magnet-optical property of HMO glasses attract many interests due to their potential applications as Magneto Optical Current Transducer (MOCT) for high voltage electric current system, optical rotator and isolator with large aperture, circulators, switches, polarimeters, etc
Literatures reported that the gold and platinum crucibles are not suitable due to their contamination to the melt glasses, ceramic crucible was considered suitable for the melting of HMO glasses
Meltquenching technique shows some problem with the preparation of PbO and Bi2O3 based glasses, since these glasses in the molten state are chemically corrosive and they react with the crucible materials to dissolve some crucible elements into the glass melts, especially for the widely used gold and platinum crucibles
Summary
Studies on the magnet-optical property of HMO glasses attract many interests due to their potential applications as Magneto Optical Current Transducer (MOCT) for high voltage electric current system, optical rotator and isolator with large aperture, circulators, switches, polarimeters, etc. Heavy metal oxide glasses based on PbO and Bi2O3 have attracted considerable attention due to their high Verdet constant, interesting physical and optical properties leading to different applications [1,2]. It is well known that the technique used for fabrication of PbO and Bi2O3 based heavy metal oxide glasses is the traditional melt-quenching, which is normally a simple and low cost technique for glass making. Due to the incorporation and subsequent aggregation of nanoparticles of metals into the glass matrix, the gold and platinum crucibles were found not suitable for preparation of PbO and Bi2O3 based magnetic-optical glasses, because the incorporation of metal nanoparticles of into the glass matrix makes the glass easy to crystallize [4] and the darkening will impact greatly the optical transmittance
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