Preparation And Spectral Properties Of Magneto-optical Glass

The high Verdet constant of the magneto-optical glass(Ge O2-B2O3-Si O2-Tb2O3) was prepared by melting method. Basic physical properties, structural, spectroscopic properties of the magneto-optical glass was explored by optical basicity, optical band gap, and RE spectral theory. Additionally, the luminescence properties of magneto-optical glass were also studied in magnetic field by different processes impact method. The main conclusions are as follows:(1) With the increase of Tb2O3 content, the density of magneto-optical glass parabolic increases and Verdet constant increases linearly. The density and Verdet constant are 6.248 g/cm3 and-0.50 min/Oe.cm when the content of Tb2O3 is 70 mol.%. Optical basicity and oxygen ion polarizability increase with molar content of Tb2O3, and resultings in a large optical basicity. The 5d energy level splitting of Tb3+ ion, increasing the magnetic moment of the magneto-optical glass and the oxygen ion polarizability, and nleads to the increase of Verdet constant;(2) GBST magneto-optical glass sample is highest stability and lowest tendency to crystallization when the Tb2O3 content is 10 mol.%. The Tb BO3 crystals have been founded after heat treatment. Network structure of GBST magneto-optical glass containing Tb3+ ions compose of a combination of network configuration such as [Si O4], [BO3] and [BO4], and the metaborate salt is existed in the glass to form a large endless chain structure which rare earth ions filled there in.(3) With the increase of Tb2O3 content, the absorption edge of the magneto-optical glass increases; while the optical band gap of the glass decreases, slightly. The orbit of Tb3+ ion with a lower polarizability could form a large polarizability group with the O2- ion, and result in the deform of electron cloud. With the increase of with rare earth ions content, non-bridging oxygen increases,; while the glass optical band gaps are reduced.(4) The excitation intensity, emission intensity and fluorescence lifetime show a increase-decrease trend with the increase of Tb2O3 content, all above properties reaches a maximum value when the Tb2O3 content was 10 mol%. The(5D3, 7F6)â†'(5D4, 7F0) cross-relaxation is the main reason which causes of the concentration quenching. The luminous intensity increases after the heat treatment. Phonon energy of the host decrease after the formation of the microcrystalline.(5) The emission intensity of the magneto-optical glass decreases after the magnetic field introduction.; while Tb2O3 content and the light emission intensity which is only related to the magneto-optical glass have little change. The decrease intensity of Luminous intensity increases after the introduction of magnetic fiel. The luminous intensity decreases with the increase of powder size, and the luminous intensity decreases with the increase of which is prepared using the powders mixed by dry grinding process is higher than the glass by wet grinding process. The smaller magneto-optical glass powder with a greater of the relative surface area, increase of the defects and quenched center, decrase the emission intensity. In addition, the-OH reacts with the glass, so that dangling bond becomes a magneto-optical surface more glass frit, surface defects number, resuls in fluorescence quenching.