Ellipsometric analysis of isothermally devitrified metallic glasses
Ellipsometric analysis of isothermally devitrified metallic glasses
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DOI：
10.1016/j.omx.2021.100095
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发表时间：
2021-12
影响因子：
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通讯作者：
Ceren Uzun;C. Meduri;S. Jagdale;G. Kumar;A. Bernussi
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文献类型：
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作者：
Ceren Uzun;C. Meduri;S. Jagdale;G. Kumar;A. Bernussi
非晶态到晶态的相变会极大地改变金属玻璃的性质，因此金属玻璃中的非玻璃化效应对于它们在各种应用中的应用是特别重要的。在这项工作中，我们利用椭圆偏振光谱技术研究了非玻璃化对金属玻璃光学性质的影响。在玻璃化转变温度和晶化温度之间的受控温度下对等温结晶样品的椭偏测量揭示了复折射率与受控析晶温度之间的特征依赖关系，这表明一种有效的光学方法可以用于表征析晶过程中的结构变化。用差示扫描量热法和X射线衍射法相结合的方法验证了析晶样品的结晶度。
Effects of devitrification in metallic glasses are of particular interest for their utilization in various applications as the phase transformation from amorphous to crystalline state is known to significantly change their properties. In this work, we study the effect of devitrification on the optical properties of metallic glasses using the spectroscopic ellipsometry technique. Ellipsometry measurements on isothermally crystallized samples at controlled temperatures between the glass transition temperature and the crystallization temperature revealed characteristic dependence of the complex index of refraction on the controlled devitrification temperature, suggesting an effective optical approach which can be prospectively used for characterization of structural changes during devitrification. The crystallinity of devitrified samples was verified using a combination of differential scanning calorimetry and X-ray diffraction measurements.