Interrelationship among dielectric constant, energy band parameters and ionicity in multi-component oxide glasses revealed by optical- and THz-band spectroscopy
Interrelationship among dielectric constant, energy band parameters and ionicity in multi-component oxide glasses revealed by optical- and THz-band spectroscopy
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光学和太赫兹波段光谱揭示多组分氧化物玻璃中介电常数、能带参数和离子度之间的相互关系
DOI：
10.1016/j.jnoncrysol.2021.121135
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发表时间：
2021
影响因子：
3.5
通讯作者：
Ci-Ling Pan
中科院分区：
文献类型：
--
作者：
Osamu Wada;Doddoji Ramachari;Chan-Shan Yang;Ci-Ling Pan
介电常数、能带参数和离子性是充分理解玻璃介电性质的关键物理参数，但它们之间的相互关系及其对各种多组分玻璃的适用性尚未得到证实。我们已经应用了光学和太赫兹光谱表征的一组多组分硅酸盐氧化物玻璃，将大大不同的添加剂成分。在光学区域评估的关键物理参数已被解释一致的单振荡器为基础的介电模型。在光学区域中估计的带隙能量（Eg）和离子性参数（Wemple和DiDomenico的β参数）分别与由THz介电常数测量评估的单极能量（Eh）和极化离子性（IP）显示出合理的对应关系。由此证实的综合相互关系提供了物理参数之间的简单规则，而不受玻璃成分的限制。例如，对于本发明的多组分玻璃组，已经确定了振荡器强度和特征共振波长之间的折衷关系以及介电常数和带隙能量之间的简单相关性。利用能带参数推导出联合态密度图，并识别出每种玻璃的特征物理/化学性质。
The dielectric constant, energy band parameters and ionicity are key physical parameters for fully understanding the dielectric properties of glasses, but their mutual interrelationship and its applicability to a wide variety of multi-component glasses have not yet been confirmed. We have applied the optical and THz spectroscopic characterization to a set of multi-component silicate oxide glasses incorporating vastly different additive components. The key physical parameters evaluated in the optical region have been interpreted consistently by the single oscillator based dielectric model. The bandgap energy (Eg) and ionicity parameter (Wemple and DiDomenico's β parameter) estimated in the optical region have shown reasonable correspondence, respectively, with the homopolar energy (Eh) and the polarization ionicity (IP) which are evaluated from the THz dielectric constant measurement. The comprehensive interrelation thus confirmed has provided simple rules between the physical parameters without limitation of glass compositions. For example, a tradeoff relation between the oscillator strength and characteristic resonance wavelength and a simple correlation between the dielectric constant and bandgap energy have been determined for the present set of multi-component glasses. The energy band parameters have been used for deriving the joint density of state diagrams, and characteristic physical/chemical nature has been identified to each glass.
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