Structure and properties of low-phonon antimony glasses and nano glass-ceramics in K2O–B2O3–Sb2O3 system
Structure and properties of low-phonon antimony glasses and nano glass-ceramics in K2O–B2O3–Sb2O3 system
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DOI：
10.1016/j.jnoncrysol.2010.01.026
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发表时间：
2010-05
影响因子：
3.5
通讯作者：
T. Som;B. Karmakar
中科院分区：
文献类型：
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作者：
T. Som;B. Karmakar
在K2O-B2O3-Sb2O3 （KBS）三元体系中制备了一系列新型低声子、低软化点单片锑玻璃和sb2o3含量高达90mol%的纳米微晶玻璃（晶径7 ~ 16nm）。红外光谱和x射线分析表明，它们的结构与Sb2O3的valentinite形态非常相似。声子能量为592-602cm−1。软化点Ts、玻璃化转变温度Tg、热膨胀系数CTE、介电常数ε和光带隙Eopt分别在331 ~ 392℃、234 ~ 264℃、201-222×10−7K−1、12.4 ~ 14.5和3.15 ~ 3.22 ev范围内变化。发现这些性质受制备样品的共价性质和光学碱度的控制。随着sb2o3含量的增加，氧化离子的平均电子极化率和光学碱度增加，相互作用参数和金属化判据降低。
A series of new low-phonon and low softening point monolithic antimony glasses and nano glass-ceramics (crystallite diameter 7–16nm) containing as high as 90mol% Sb2O3were prepared in the ternary K2O–B2O3–Sb2O3(KBS) system. Infrared spectra and X-ray analysis establish that their structures closely resemble valentinite form of Sb2O3. The phonon energy has been found to be 592–602cm−1. The softening point (Ts), glass transition temperature (Tg), coefficient of thermal expansion (CTE), dielectric constant (ε) and optical band gap (Eopt) have been found to vary in the ranges 331–392°C, 234–264°C, 201–222×10−7K−1, 12.4–14.5 and 3.15–3.22eV, respectively. These properties are found to be controlled by the covalent character and optical basicity of prepared samples. The average electronic polarizability of the oxide ions and optical basicity are found to increase while interaction parameter and metallization criterion decrease with increase in Sb2O3content.