Synthesis and characterization of Na+ conducting glass-ceramic Na5FeSi4O12 doped with boron, aluminum, and gallium oxides
Synthesis and characterization of Na+ conducting glass-ceramic Na5FeSi4O12 doped with boron, aluminum, and gallium oxides
复制标题
DOI：
10.1016/j.jnoncrysol.2020.120236
复制
发表时间：
2020-10-01
影响因子：
3.5
通讯作者：
Okura, Toshinori
中科院分区：
文献类型：
--
作者：
Kawada, Koji;Yamashita, Kimihiro;Okura, Toshinori
采用晶化法制备了钠离子导电玻璃陶瓷Na 5 FeSi 4 O 12。用差热分析法研究了玻璃的最佳析晶条件和析晶动力学。分别采用非等温修正基辛格法和复阻抗法对所制得的玻璃陶瓷Na（5）FeSi（4）O（12）的结晶性能和导电性能进行了表征。晶化活化能为279 kJ mol（-1），在300 ℃下钠离子电导率为1.33 x 10（-3）S cm（-1）。为了提高玻璃的电导率，采用少量的Si替代物，按照与Na 5. 1 FeM 0. 1 Si 3. 9 O 12（M = B，Al，Ga）玻璃相同的晶化过程，制备了含B，Al，Ga的Na 5 FeSi 4 O 12同构衍生物。在没有相分离的情况下，玻璃陶瓷的离子电导率在300 ℃下在Na5.1FeM0.1Si3.9O12上提高到1.69 × 10（-3），而在300 ℃下在Na5.1FeAl0.1Si3.9O12和Na5.1FeGa0.1Si3.9O12上下降到1.30 × 10（-3）和1.12 × 10（-3）S cm（-1），分别
Sodium-ion conducive glass-ceramics of Na5FeSi4O12 were successfully synthesized through the crystallization of glasses with the composition Na5FeSi4O12. The optimum crystallization conditions and the kinetics of the glasses were examined by differential thermal analysis. The characterization of crystallization and conduction properties were performed on thus obtained glass-ceramic Na(5)FeSi(4)O(12 )by a non-isothermal modified Kissinger and complex impedance methods, respectively. The activation energy for crystallization was 279 kJ mol(-1) and the sodium-ion conductivity was obtained as 1.33 x 10(-3) S cm(-1) at 300 degrees C. To improve the conductivity with a small amount of Si-substitutes, Na5FeSi4O12-isostructural derivatives containing such as B, Al, and Ga were also prepared according to the same crystallization process of glasses with the composition Na5.1FeM0.1Si3.9O12 (M = B, Al, Ga). Without phase separation, the ionic conductivities of glass-ceramics were enhanced up to 1.69 x 10(-3) at 300 degrees C on Na5.1FeM0.1Si3.9O12, whereas decreased down to 1.30 x 10(-3) and 1.12 x 10(-3) S cm(-1) at 300 degrees C on Na5.1FeAl0.1Si3.9O12, and Na5.1FeGa0.1Si3.9O12, respectively.