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首页> 外文期刊>Crystal growth & design >Formation of Ba2NaNb5O15 Crystal and Crystallization Kinetics in BaO-Na2O-Nb2O5-SiO2-B2O3 Glass
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Formation of Ba2NaNb5O15 Crystal and Crystallization Kinetics in BaO-Na2O-Nb2O5-SiO2-B2O3 Glass

机译：Ba2N2O-Nb2O5-SiO2-B2O3玻璃中Ba2NANB5O15晶体和结晶动力学的形成

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摘要

We have synthesized Ba2NaNb5O15 (BNN) crystal by annealing 25.6BaO-6.4Na(2)O-32Nb(2)O(5)-24SiO(2)-12B(2)O(3) (BNNSB) glass and investigated the crystallization kinetics from the glass. The glass sample was prepared by a plate quenching method. Thermal, structural, vibrational, and surface properties have been studied by using differential thermal analysis, X-ray diffraction, Raman spectroscopy, and atomic force microscopy, respectively. It is found that the crystallite sizes of the orthorhombic Ba2NaNb5O15 crystal occurring in the BNNSB glass are confined within 30-70 nm. The Williamson-Hall plot was applied to estimate the effect of crystallite size and strain to Bragg peak broadening. The isothermal model of the Johnson Mehl Avrami Kolmogorov function was applied to characterize the kinetics of the crystallization process. The Avrami exponent 4.5 indicates that the crystallization mechanism belongs to an increasing nucleation rate with diffusion-controlled growth. The activation energy of crystallization, 5.0 eV, obtained from the isothermal model, shows a value similar to that resulting from the isoconversion method. The Raman scattering patterns, which are very different between the crystalline and glass phases, have been deconvoluted, and the various vibrational modes have been explained based on the network dimensionality, nonbridging oxygen, and the degree of structural order.
机译：通过退火25.6baO-6.4na（2）O-32nb（2）O（5）-24siO（2）-12b（2）O（3）（bnnsb）玻璃来合成Ba2NAnb5O15（2）o-32nb（2）℃（2）O-32nb（2）℃，并研究结晶来自玻璃的动力学。通过板淬火方法制备玻璃样品。通过使用差分热分析，X射线衍射，拉曼光谱和原子力显微镜研究，研究了热，结构，振动和表面性质。发现在BNNSB玻璃中发生的正交BA2NANB5O15晶体的微晶尺寸限制在30-70nm内。应用Williamson-Hall图来估算微晶尺寸和菌株对布拉格峰扩大的影响。应用了Johnson Mehl Avrami Kolmogorov函数的等温模型，以表征结晶过程的动力学。 AVRAMI指数4.5表明结晶机制属于具有扩散控制的增长的核切割速率。从等温模型获得的结晶，5.0eV的激活能量显示出类似于由异元转化方法产生的值。在结晶和玻璃相之间的拉曼散射图案已经被脱顽固，并且已经基于网络维度，非录音氧气和结构顺序的程度来解释各种振动模式。

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  • 来源
    《Crystal growth & design》 |2017年第11期|共7页
  • 作者

    Baek C. G.; Kim M.; Kwon O. H.; Choi H. W.; Yang Y. S.;

  • 作者单位

    Pusan Natl Univ Coll Nanosci &

    Nanotechnol Dept Nano Fus Technol Busan 46241 South Korea;

    Pusan Natl Univ Coll Nanosci &

    Nanotechnol Dept Nano Fus Technol Busan 46241 South Korea;

    Pusan Natl Univ Coll Nanosci &

    Nanotechnol Dept Nano Fus Technol Busan 46241 South Korea;

    Pusan Natl Univ Coll Nanosci &

    Nanotechnol Dept Nano Fus Technol Busan 46241 South Korea;

    Pusan Natl Univ Coll Nanosci &

    Nanotechnol Dept Nano Fus Technol Busan 46241 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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