Elastic Anomaly of Glass Transitions in Lithium Silicate
Elastic Anomaly of Glass Transitions in Lithium Silicate
复制标题
硅酸锂玻璃化转变的弹性异常
DOI：
10.1143/jjap.44.6683
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发表时间：
2005
影响因子：
1.5
通讯作者：
S. Feller
中科院分区：
文献类型：
--
作者：
A. Hushur;S. Kojima;M. Kodama;Ben Whittington;M. Olesiak;M. Affatigato;S. Feller
在较宽的温度范围内研究了不同锂氧化物浓度的锂硅酸盐玻璃的布里渊光谱。室温弹性常数随锂氧化物浓度的增加而显著增大。这表明刚性随锂氧化物浓度的增加而增加。从纵向弹性模数随温度变化的曲线可以看出，硬度随加热温度的增加而降低，锂含量越高，硬度降低的速度越快。在玻璃化转变温度Tg以上，降幅明显增大。这与网键的破坏有关，抑制了熔体结构在加热时的刚性。随着锂离子浓度的增加，网络结构的降解速度加快。测定了锂硅酸盐玻璃的玻璃化转变温度。随着氧化锂浓度的增加，材料的脆性增加，反映了温度高于Tg时，材料的纵向弹性模量值显著降低。晶化温度随锂氧化物浓度的增加而降低。
Brillouin spectra of lithium silicate glasses with various lithium oxide concentrations have been investigated over a wide temperature range. The room-temperature elastic constants increase significantly with increasing lithium oxide concentration. This indicates that rigidity increases with lithium oxide concentration. From the temperature dependence of the longitudinal elastic modulus, it was found that the rigidity decreases on heating, faster with a high lithium content. The rate of decrease becomes significantly larger above the glass transition temperature Tg. This is related to the disruption of network bonds, suppressing the rigidity of the melt structures on heating. The increased lithium oxide concentration leads to a faster degradation in the network structure. The Tg of lithium silicate glasses was determined. The increased fragility with increased lithium oxide concentration reflects the significant decrease in longitudinal elastic modulus with temperatures above Tg. Crystallization temperature decreases with increasing lithium oxide concentration.
微布里球散射观察铁电二钛酸钡的弛豫模式
DOI：
--
发表时间：
2004
期刊：
Jpn.J.Appl.Phys. 43,9B
影响因子：
--
作者：
A.Hushur;H.Shigematsu;Y.Akishige;S.Kojima
通讯作者：
S.Kojima