Rate of homogeneous nucleation in alkali disilicate glasses
Rate of homogeneous nucleation in alkali disilicate glasses
复制标题
碱金属二硅酸盐玻璃中的均匀成核率
DOI：
10.1016/0022-3093(73)90092-6
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发表时间：
1973
影响因子：
3.5
通讯作者：
M. Tashiro
中科院分区：
文献类型：
--
作者：
K. Matusita;M. Tashiro
在光学显微镜下，用晶体数法测定了二硅酸碱玻璃的结晶成核速率。用光束弯曲法和穿透法测量了这些玻璃的粘度。利用本研究获得的成核速率和黏度数据以及Takahashi和Yoshio测量的自由能数据，根据均相成核理论估计了碱-二硅酸体系的晶体-玻璃界面能：Li2O·2SiO2为196 erg/cm2， Na2O·2SiO2为126 ~ 144 erg/cm2， K2O·2SiO2为88 ~ 104 erg/cm2。讨论了玻璃粘度、晶体与玻璃之间的自由能差和晶体-玻璃界面能对成核速率的影响，指出Li2O·2sio2玻璃中较高的成核速率是由较大的自由能差引起的。
Rates of crystal nucleation in alkali disilicate glasses were measured by counting the number of crystals under an optical microscope. The viscosities of these glasses were measured by the method of beam-bending and penetration. Using the data of rate of nucleation and viscosity obtained in the present study and the data of free energy measured by Takahashi and Yoshio, crystal-glass interfacial energies for alkali disilicate systems were estimated on the basis of homogeneous nucleation theory as follows: 196 erg/cm2for Li2O·2SiO2, 126–144 erg/cm2for Na2O·2SiO2and 88–104 erg/cm2for K2O·2SiO2. The effects of the viscosity of glass, the free energy difference between crystal and glass and crystal-glass interfacial energy on the rate of nucleation were discussed, and the remarkably higher rate of crystal nucleation in the Li2O·2SiO2glass was attributed to the larger free energy difference.