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Synthesis, characterization and electrical properties of Na_6M(SO_4)_4 (M = Co, Ni, Cu) vanthoffite materials

机译:Na_6M(SO_4)_4(M = CO,Ni,Cu)Vanthoffite材料的合成,表征和电性能

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摘要

In this work we synthesized pure phases of Na6M (SO4)(4) (M = Co, Ni, Cu) vanthoffite ceramics denoted as NMS using the solid-state reaction method. The obtained materials crystallized in the monoclinic system with space group P2(1)/c. The infrared (IR) and visible (Vis) spectroscopies revealed the vibrational mode of sulfate groups and verified the absorption band of the bivalent metal. Electrical conductivity was studied using impedance spectroscopy in the 633-713 K temperature range. Results show that the materials present anionic semiconductor behavior and that conductivity increases with temperature. Ionic conduction within these materials arises from the migration of cations in the crystalline system in a 2D direction or from jumping into the vacancy sites. The activation energy values confirm that the materials represent candidates that may be used as electrodes in sodium-ion batteries.
机译:在这项工作中,我们合成了使用固态反应方法作为NMS表示为NMS的Na6M(SO 4)(4)(4)(M = Co,Ni,Cu)的纯相。所得材料在具有空间组P2(1)/ C的单斜斜肌系统中结晶。红外(IR)和可见(Vis)光谱揭示了硫酸盐基团的振动模式,并验证了二价金属的吸收带。使用阻抗光谱在633-713K温度范围内研究电导率。结果表明,该材料存在阴离子半导体行为,并且电导率随温度而增加。这些材料内的离子传导产生在2D方向上的阳离子中的阳离子迁移或跳入空位位点。激活能量值证实了这些材料代表可用作钠离子电池中的电极的候选物。

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