Fast potassium ion conducting glass-ceramics of Na5YSi4O12-type Na4-xKxY0.6P0.2Si2.8O9
Fast potassium ion conducting glass-ceramics of Na5YSi4O12-type Na4-xKxY0.6P0.2Si2.8O9
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DOI：
10.1016/j.matlet.2022.131741
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发表时间：
2022-01-21
影响因子：
3
通讯作者：
Yamashita, Kimihiro
中科院分区：
文献类型：
--
作者：
Okura, Toshinori;Ota, Yuki;Yamashita, Kimihiro
采用玻璃制晶技术制备了具有na5ysi4o12型晶体结构的新型K+离子导电玻璃陶瓷Na4-xKxY0.6P0.2Si2.8O9 （x < 0.60）。在873 K、6 h和1173 K、5 h的温度和时间下进行了成核和结晶。在573 K时，当x < 0.60时，所制备的玻璃陶瓷的电导率为1 × 10-2 ~ 5 × 10-2 S cm- 1；而在x = 0时，传导活化能由22 kJ mol- 1增加到0.05 < x < 0.15时的44 kJ mol- 1。离子转移数的测量表明，在部分K+取代的Na4-xKxY0.6P0.2Si2.8O9玻璃陶瓷中，K+的传导主要发生在K+离子取代了可移动的Na+离子的地方，而不是Na+离子与SiO4四面体刚性结合的地方。
Novel K+ ion conducting glass-ceramics of Na4-xKxY0.6P0.2Si2.8O9 (x < 0.60) with the Na5YSi4O12-type crystalline structure were produced via a glass-making technique. The temperature and time for nucleation and crystallization were determined to be 873 K and 6 h and 1173 K and 5 h, respectively. The thus-prepared glassceramics exhibited excellent conductivities of 1 x 10-2 to 5 x 10-2 S cm- 1 at 573 K when x < 0.60; however, the activation energies for conduction increased from 22 kJ mol- 1 at x = 0 to 44 kJ mol- 1 at 0.05 < x < 0.15. Measurements of the ion transference numbers indicated that K+ conduction in the glass-ceramics of partially K+substituted Na4-xKxY0.6P0.2Si2.8O9 occurred predominantly where K+ ions had substituted mobile Na+ ions rather than the Na+ ions rigidly bonded to SiO4 tetrahedra.