Synthesis, Polymorphs and Sodium Ionic Conductivity of Sodium Yttrium Silicophosphates with the Composition
Synthesis, Polymorphs and Sodium Ionic Conductivity of Sodium Yttrium Silicophosphates with the Composition
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该组合物硅磷酸钇钠的合成、晶型及钠离子电导率
DOI：
10.2109/jcersj.96.967
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发表时间：
1988
影响因子：
1.1
通讯作者：
T. Kanazawa
中科院分区：
文献类型：
--
作者：
K. Yamashita;Sadakatsu Ohkura;T. Umegaki;T. Kanazawa
在Na_2 O-Y_2 O_3-SiO_2-P_2O_5体系中，合成了三种化合物：Na ~（3+）3x-yY_（1-x）PySi_（3-y）O_（9）、Na ~（5+）3x-yY_（1-x）PySi_（4-y）O_（12）和Na ~（9+）3x-yY_（1-x）PySi_（6-y）O_（18）。结果表明，材料的电导率和活化能与物相和组成密切相关：10 ~（-6）S/cm<σ300<10 ~（-1）S/cm和20 kJ/mol<E<88 kJ/mol。每种NYPS的详细情况总结如下：N3 YPS：具有六元（Si，P）O 4环的C3 A型结构5×10-5S/cm<σ300<1×10-2S/cm，45 kJ/mol<E<85 kJ/mol单相区：0.6-0.5[P]<[Y]，[P]<0.8N5YPS：12元（Si，P）O 4环1×10-2S/cm<σ300<1×10- 1 S/cm，20 kJ/mol<E<25 kJ/mol单相区：0.5-0.5[P]<[Y]<0.8-0.5[P]，[P]<0.7N9YPS：N_3YPS（C_3A型）的可能同构4×10 ~（-4）S/cm<σ_300 <1×10 ~（-3）S/cm，42 kJ/mol<E<60 kJ/mol单相区：0.5-0.5[P]<[Y]<0.8-0.5[P]，[P]<0.4
In the system Na2O-Y2O3-SiO2-P2O5, the following three kinds of compounds were obtained: Na3+3x-yY1-xPySi3-yO9, Na5+3x-yY1-xPySi4-yO12 and Na9+3x-yY1-xPySi6-yO18. The ionic conductivity and activation energy of the present materials were found to exhibit strong dependence on phase and composition: 10-6S/cm<σ300<10-1S/cm and 20kJ/mol<E<88kJ/mol. The details of each NYPS are summarized as the following.N3YPS: C3A-type structure with 6-membered (Si, P)O4 rings 5×10-5S/cm<σ300<1×10-2S/cm, 45kJ/mol<E<85kJ/mol single-phase region: 0.6-0.5[P]<[Y], [P]<0.8N5YPS: 12-membered (Si, P)O4 rings 1×10-2S/cm<σ300<1×10-1S/cm, 20kJ/mol<E<25kJ/mol single-phase region: 0.5-0.5[P]<[Y]<0.8-0.5[P], [P]<0.7N9YPS: probably iso-structure of N3YPS (C3A-type) 4×10-4S/cm<σ300<1×10-3S/cm, 42kJ/mol<E<60kJ/mol single-phase region: 0.5-0.5[P]<[Y]<0.8-0.5[P], [P]<0.4