旋光玻璃的主要性质为费尔德常数。
The main property of Faraday rotatory glass is the Verdet constant.
含高顺磁离子的旋光玻璃具有大的费尔德常数，可见区高透过等优点。
Faraday rotatory glass containing high paramagnetic ion concentration is of the large Verdet constant, transparency in the visible region of light.
观测到费尔德常数随温度的微弱变化，而这种变化是同样品的体积膨胀相联系的。
A small variation of the Verdet constant with temperature that was associated with the volume expansion of the sample was observed.
同时，实验发现铽玻璃样品的费尔德常数在333k以上时会出现反弹，与该理论模型不符，有待于进一步研究。
In addition, the Verdet constant of the terbium glass sample rebounds when the temperature goes higher than 333k, which is out of accord with the theoretical model and need to be further researched.
同时，实验发现铽玻璃样品的费尔德常数在333k以上时会出现反弹，与该理论模型不符，有待于进一步研究。
In addition, the Verdet constant of the terbium glass sample rebounds when the temperature goes higher than 333k, which is out of accord with the theoretical model and need to be further researched.
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