高温气相沉积锗玻璃中增强的中程有序
Enhanced Medium Range Order in Vapor Deposited Germania Glasses at Elevated Temperatures
摘要：
玻璃是非平衡固体，其性质高度依赖于其制备方法。在气相沉积分子玻璃中，结构组织可以容易地随沉积速率和衬底温度调节。在这里，我们显示了强网络形成GeO2玻璃的原子排列在中等范围（< 2 nm）通过在高温下的气相沉积进行修改。拉曼光谱特征显着显示人口的六元GeO4环增加在升高的衬底温度。在中等范围内，在玻璃化转变温度附近的沉积比生长后退火在修改原子结构方面更有效。增强的中程组织与室温内耗的降低相关。确定非晶氧化物中室温内摩擦的微观起源对于设计下一代引力波干涉仪末端测试质量的反射镜的干涉涂层至关重要，其中室温内摩擦是限制其灵敏度的主要噪声源。
英文摘要：
Glasses are nonequilibrium solids with properties highly dependent on their method of preparation. In vapor-deposited molecular glasses, structural organization could be readily tuned with deposition rate and substrate temperature. Herein, we show the atomic arrangement of strong network forming GeO2 glass is modified at medium range (< 2 nm) through vapor deposition at elevated temperatures. Raman spectral signatures distinctively show the population of 6-membered GeO4 rings increases at elevated substrate temperatures. Deposition near the glass transition temperature is more efficient than post-growth annealing in modifying atomic structure at medium range. The enhanced medium range organization correlates with reduction of the room temperature internal friction. Identifying the microscopic origin of room temperature internal friction in amorphous oxides is paramount to design the next generation interference coatings for mirrors of the end test masses of gravitational wave interferometers, in which the room temperature internal friction is a main source of noise limiting their sensitivity.
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