Crystallization kinetics of lithium niobate glass: determination of the Johnson-Mehl-Avrami-Kolmogorov parameters

被引：29
作者：
Choi, H. W. [1 ]
Kim, Y. H. [2 ]
Rim, Y. H. [3 ]
Yang, Y. S. [4 ]
机构：
[1] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea
[2] Japan Synchrotron Radiat Res Inst, Hyogo 6795198, Japan
[3] Semyung Univ, Sch Liberal Arts, Chechon 390711, Chungbuk, South Korea
[4] Pusan Natl Univ, Dept Nano Fus Technol, Pusan 609735, South Korea
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 24期
基金：
新加坡国家研究基金会;
关键词：
OPTICAL-PROPERTIES; THERMAL-ANALYSIS; PHASE-CHANGE; SENSOR; TRANSFORMATION; NUCLEATION; GROWTH;
D O I：
10.1039/c3cp50909e
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The formation of crystalline LiNbO3 (LN) from LN glass has been studied by means of differential scanning calorimetry and in situ synchrotron X-ray diffraction. The LN glass with no glass former was prepared by the polymerized complex method. The isothermal kinetics of the crystallization process is described using the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation and the Avrami exponent n is found to be similar to 2.0, indicating that the crystallization mechanism is diffusion-controlled growth with a decreasing nucleation rate. The effective activation energy of crystallization calculated from isothermal measurements is 6.51 eV. It is found that the LN glass directly transforms into a rhombohedral LN crystal without any intermediate crystalline phase and most crystal grains are confined within the size of similar to 40 nm irrespective of different isothermal temperatures. Application of JMAK theory to the non-isothermal thermoanalytical study of crystallization of LN glass is discussed.
引用
收藏
页码：9940 / 9946
页数：7
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