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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Characteristics of La_2CaB_(10)O_(19) crystallization from glass
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Characteristics of La_2CaB_(10)O_(19) crystallization from glass

机译：La_2CaB_（10）O_（19）从玻璃中结晶的特征

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摘要

The characteristics of La_2CaB_(10)O_(19) (LCB) crystallization from a La_2O_3-CaO-B_2O _3 glass were studied. The crystal growth rate (U) was estimated from the crystalline layer thicknesses to obtain the activation energy for growth (E_G), which was found to be 418 kJ/mol. The activation energy for overall crystallization (E), obtained from non-isothermal differential thermal analysis (DTA) by the methods of Kissinger and Ozawa, was in the range of 398-417 kJ/mol. A comparison of the activation energies showed that E ? E_G. X-ray diffraction (XRD) patterns, light microscopy images and second harmonic generation tests, confirmed that LCB is the dominant phase crystallizing from the glass. Nucleation-rate type curves derived from DTA measurements showed that the annealed glass behaved as a nuclei site-saturated matrix. Transmission electron microscopy and selected area electron diffraction images of fine glass powders indicated the presence of crystalline clusters of 30-50 nm, which are related to the phases detected by XRD. The crystallization of LCB from the glass was characterized by a growth process from a nuclei site-saturated matrix and could be analyzed by the Johnson-Mehl-Avarmi kinetic model.
机译：研究了从La_2O_3-CaO-B_2O_3玻璃中La_2CaB_（10）O_（19）（LCB）结晶的特性。由结晶层的厚度估算晶体的生长速率（U）以获得生长的活化能（E_G），发现该活化能为418kJ / mol。通过基辛格和小泽的方法从非等温差热分析（​​DTA）获得的总结晶活化能（E）在398-417 kJ / mol范围内。活化能的比较表明，E≥1。例如。 X射线衍射（XRD）图案，光学显微镜图像和二次谐波生成测试证实了LCB是从玻璃中结晶的主要相。从DTA测量得出的成核速率类型曲线表明，退火玻璃表现为核位点饱和的基质。细玻璃粉的透射电子显微镜和选择的区域电子衍射图像表明存在30-50 nm的晶簇，这与XRD检测到的相有关。 LCB从玻璃中的结晶特征是从原子核位点饱和的基质中生长出来，并且可以通过Johnson-Mehl-Avarmi动力学模型进行分析。

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