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Nanometric Fluctuations of Sound Velocity in Alkali Borate Glasses and Fragility of Respective Melts
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-05-30 , DOI: 10.1002/pssb.202000073 Seiji Kojima 1 , Vladimir N. Novikov 2 , Maiko Kofu 3 , Osamu Yamamuro 4
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-05-30 , DOI: 10.1002/pssb.202000073 Seiji Kojima 1 , Vladimir N. Novikov 2 , Maiko Kofu 3 , Osamu Yamamuro 4
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The network structure of borate glass is remarkably modified by the addition of alkali metals. The alkali metal dependences of the first sharp diffraction peak (FSDP) and the boson peak (BP) are investigated in alkali borate glasses by elastic and inelastic neutron scattering experiments. With an increase in ionic radius of alkali ions, both the width ΔQ of FSDP and the BP energy decrease. The comparison of the characteristic length of medium‐range order (MRO) predicted by the FSDP and the position of the BP allows us to find the mean‐square fluctuations of the transverse sound velocity within series of alkali borate glasses. It is shown that the fragility of the respective alkali borate melts inversely correlates with the mean‐square fluctuations of the transverse sound velocity in glassy state.
中文翻译：
碱金属硼酸盐玻璃中声速的纳米波动和各熔体的脆性
通过添加碱金属，硼酸盐玻璃的网络结构显着改变。通过弹性和非弹性中子散射实验研究了碱金属硼酸盐玻璃中第一尖锐衍射峰（FSDP）和玻色子峰（BP）的依赖性。与增加的碱金属离子的离子半径，无论是宽度Δ Q FSDP和BP能量降低。FSDP预测的中程级特征长度（MRO）与BP位置的比较使我们能够找到一系列碱金属硼酸盐玻璃内横向声速的均方差。结果表明，相应的碱金属硼酸盐熔体的脆性与玻璃态横向声速的均方波动呈反比。
更新日期：2020-05-30
中文翻译：
碱金属硼酸盐玻璃中声速的纳米波动和各熔体的脆性
通过添加碱金属，硼酸盐玻璃的网络结构显着改变。通过弹性和非弹性中子散射实验研究了碱金属硼酸盐玻璃中第一尖锐衍射峰（FSDP）和玻色子峰（BP）的依赖性。与增加的碱金属离子的离子半径，无论是宽度Δ Q FSDP和BP能量降低。FSDP预测的中程级特征长度（MRO）与BP位置的比较使我们能够找到一系列碱金属硼酸盐玻璃内横向声速的均方差。结果表明，相应的碱金属硼酸盐熔体的脆性与玻璃态横向声速的均方波动呈反比。
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