Crystallization Kinetics and Phase Transformation of Li_2O–Fe_2O_3–MnO_2–CaO–P_2O_5–SiO_2 Glass
Crystallization Kinetics and Phase Transformation of Li_2O–Fe_2O_3–MnO_2–CaO–P_2O_5–SiO_2 Glass
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DOI：
10.1557/jmr.1998.0370
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发表时间：
1998-09
影响因子：
2.7
通讯作者：
Chi-Shiung His;Moo-Chin Wang
中科院分区：
文献类型：
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作者：
Chi-Shiung His;Moo-Chin Wang
用差热分析、X射线衍射仪和扫描电子显微镜研究了10Li_2O–14Fe_2O_3–11MnO_2–25CaO–5P_2O_5–35SiO_2(LFMCPS)玻璃的析晶动力学和相变过程。X-射线衍射仪测定的主晶相为三叶石[Li(Fe0.5Mn0.5)PO4]、β硅灰石(βCaO SiO_2)和磁铁矿(Fe_3O_4)。用差热分析法研究了LMFCPS玻璃的非等温析晶动力学。LFMCPS玻璃的析晶活化能为74.6kcalymo1。在升温速率为5°C/min时，生长形貌参数n为0.98，当升温速率为20°C/min时，生长形貌参数n降至0.74。在较低的结晶温度下，结晶机理的数值因子m为0.57，并随着温度的升高逐渐减小。对于该实验，参数n和m近似为1。这些结果表明，LFMCPS玻璃晶化过程中表面成核起主导作用。
The crystallization kinetics and phase transformation of 10Li_2O–14Fe_2O_3–11MnO_2–25CaO–5P_2O_5–35SiO_2 (LFMCPS) glass have been investigated using differential thermal analysis (DTA), Χ-ray diffraction (XRD), and scanning electron microscopy (SEM). The major crystalline phase determined by XRD analysis was triphylite [Li(Fe_0.5Mn_0.5)PO_4], β–wollastonite (β CaO SiO_2) and magnetite (Fe_3O_4) as the minor phases. The nonisothermal kinetics of crystallization of the LMFCPS glass was investigated using DTA analysis. The activation energy of crystallization for LFMCPS glass was 74.6 kcalymol. The growth morphology parameter n was 0.98 at a heating rate of 5 °C/min and decreased to 0.74 as the heating rate increased to 20 °C/min. The numerical factor of crystallization mechanism m was 0.57 at low crystallization temperature and gradually decreased as the temperature increased. For the experiment, the parameters n and m were approximately one. These results indicated that the surface nucleation was dominant in LFMCPS glass crystallization.