The linear coefficient of quartz sight glass at different temperatures

The linear coefficient of quartz sight glass at different temperatures

温度(℃)	100	200	300	400	500	600	700	800	1000	1200
线系数(×10-7)	5.10	5.85	6.27	6.35	6.12	6.00	5.71	5.62	5.56	5.42

 
After adding a proper amount of TiO2 to quartz sight glass, its coefficient is only 1/25 and zero of ordinary quartz sight  glass. This is mainly because the O between the Si and the Ti produces a stronger transverse vibration cation, and the coefficient becomes smaller. With the addition of TiO2, the coefficient can reach a negative value.

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