Thermal stability and proton conductivity of densely proton injected phosphate glasses containing rare-earth elements
Thermal stability and proton conductivity of densely proton injected phosphate glasses containing rare-earth elements
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含稀土元素的致密质子注入磷酸盐玻璃的热稳定性和质子电导率
DOI：
10.1016/j.jnoncrysol.2020.120064
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发表时间：
2020
影响因子：
3.5
通讯作者：
J. Nishii
中科院分区：
文献类型：
--
作者：
A. Miyazaki;T. Kinoshita;T. Tatebayashi;T. Fang;Y. Ren;T. Ishiyama;T. Yamaguchi;T. Omata;M. Fujioka;H. Kaiju;G. Zhao;J. Nishii
采用碱-质子取代(APS)技术，在25NaO1/2-3MgO-7LnO3/2-3GeO2-62PO5/2(摩尔%，Ln=La，Nd，Gd，Dy，Y，Yb)玻璃中，用取代率大于90%的质子电化学取代钠离子。研究了稀土元素种类对其玻璃化转变温度(Tg)、结构、热稳定性和质子电导率等性能的影响。尽管Tg和玻璃网络结构几乎彼此相同，但从加热失重的起始温度来评价它们的热稳定性明显依赖于稀土元素。经APS处理的含Dy的玻璃表现出最高的热稳定性：它的热稳定性高达600℃，比其玻璃化温度高出约370℃，没有析晶。热稳定性取决于稀土元素的种类，这与玻璃和析出的晶相之间的结构差异有关。质子电导率几乎与稀土元素的种类无关。因此，含Dy的玻璃具有最高的热稳定性，在550C时具有最高的质子电导率，为4×10−3Scm−1。
Sodium ions in 25NaO 1/2–3MgO–7LnO 3/2–3GeO 2–62PO 5/2 (mol%, Ln= La, Nd, Gd, Dy, Y, Yb) glasses were electrochemically substituted with protons with a substitution rate higher than 90% by using an Alkali-Proton Substitution (APS) technique.. Effects of rare-earth element species on various properties were investigated, such as the glass transition temperature (Tg), structure, thermal stability, and proton conductivity. Whereas Tg and glass network structures were almost mutually identical irrespective of the rare-earth element species, their thermal stability as evaluated from the onset temperature of weight loss during heating was found to be significantly dependent on the rare-earth element species. The glass containing Dy after APS exhibited the highest thermal stability among the glasses: it was stable up to 600 C, which is ca. 370 C higher than its Tg, without crystallization. Thermal stability depending on the rare-earth element species was related to the difference in the structure between the glass and the crystalline phase that precipitated from the glass. The proton conductivity was almost independent of the rare-earth element species. Therefore, the glass containing Dy which exhibited the highest thermal stability among the glasses exhibited the highest proton conductivity of 4× 10− 3 Scm− 1 at 550 C.
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发表时间：
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