Mechanochemical synthesis of rock salt-type Na2CaSnS4 as a sodium-ion conductor†

RSC Mechanochemistry Pub Date : 2024-12-03 DOI:10.1039/D4MR00028E

Hamdi Ben Yahia, Atsushi Sakuda and Akitoshi Hayashi

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Abstract

Na₂CaSnS₄ was prepared by mechanochemical synthesis from a mixture of Na₂S, CaS, and SnS₂. The crystal structure was determined from X-ray powder diffraction data. The chemical composition was confirmed by energy dispersive X-ray spectroscopy, and the ionic conductivity was measured using electrochemical impedance spectroscopy. Na₂CaSnS₄ crystallizes with a rock salt-type structure, space group Fmm, a = 5.6842 (3) Å, V = 183.66 (2) Å³, and Z = 1. All the cations are statistically disordered over a unique crystallographic site and are octahedrally coordinated to the sulfur atoms. The ionic conductivity of Na₂CaSnS₄ is 4.2 × 10⁻⁸ S cm⁻¹ (E_a = 0.6 eV) at 33 °C.

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岩盐型钠离子导体Na2CaSnS4的机械化学合成

以Na2S、CaS和SnS2为原料，采用机械化学法合成了Na2CaSnS4。晶体结构由x射线粉末衍射数据确定。用能量色散x射线谱法确定了其化学成分，并用电化学阻抗谱法测定了离子电导率。Na2CaSnS4结晶为岩盐型结构，空间群Fmm， a = 5.6842 (3) Å， V = 183.66 (2) Å3, Z = 1。在统计上，所有的阳离子在一个独特的晶体位置上是无序的，并且与硫原子呈八面体配位。在33℃时，Na2CaSnS4的离子电导率为4.2 × 10−8 S cm−1 （Ea = 0.6 eV）。

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RSC Mechanochemistry

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