Glasses in Tb_2O_3-B_2O_3-GeO _2 (TBG) system with high, up to 33 mol% Tb_2O_3 content, have been obtained, and their crystallization behavior, spectral and magneto-optical properties studied. It was found that Verdet constant V of TBG glasses for wavelength 632.8 nm reached very high values: more than 0.4 arc min/cm Oe. Transparent and colorless TBG glasses with low absorption coefficient a for working wavelength 1.064 μm were prepared by varying redox conditions of melting. It provided high magneto-optical figure of merit V/a exceeding the same option of industrial glasses. The melt temperature of TBG glasses obtained did not exceed 1450 °C. This temperature is much lower than that of silicate magneto-optical glasses, promoting homogeneity of glass melt and facilitating production of TBG optical quality glasses. The observed correlation between the Verdet constant and Tb~(3+) content indicates that the Borrelli's approach, explaining magneto-optical activity in glasses only by paramagnetic ion content, extends also to high concentrated rare earth oxide glasses.
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机译：已获得Tb_2O_3-B_2O_3-GeO _2（TBG）体系中Tb_2O_3含量高达33 mol％的玻璃，并研究了它们的结晶行为，光谱和磁光性质。发现TBG玻璃的波长为632.8nm的维尔德常数V达到非常高的值：大于0.4弧分/ cm Oe。通过改变熔融的氧化还原条件，制备了对工作波长为1.064μm的低吸收系数a的透明无色TBG玻璃。它提供的高磁光品质因数V / a超过了工业眼镜的相同选择。得到的TBG玻璃的熔融温度不超过1450℃。该温度远低于硅酸盐磁光玻璃的温度，从而促进了玻璃熔体的均匀性，并促进了TBG光学品质玻璃的生产。观察到的维尔德常数与Tb〜（3+）含量之间的相关性表明，仅通过顺磁性离子含量解释玻璃中的磁光活性的Borrelli方法也适用于高浓度稀土氧化物玻璃。
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