Structural insights into ion conduction of layered double hydroxides with various proportions of trivalent cations
Structural insights into ion conduction of layered double hydroxides with various proportions of trivalent cations
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DOI：
10.1039/c3ta13632a
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Bendersky, Leonid A.
中科院分区：
文献类型：
--
作者：
Miyazaki, Kohei;Asada, Yuya;Bendersky, Leonid A.
本文报道了平面阳离子排列对层状双氢氧化物(LDHs)离子电导的结构影响。用共沉淀法合成了不同比例三价阳离子的Mg-Al-CO_3和Mg-Ga-CO_3 LDHs，发现只有在特定比例的三价阳离子下，它们的离子电导率才有较大幅度的提高。电子束衍射谱表明，具有这种比例的LDH在(0001)氢氧化层中具有有序的二价阳离子和三价阳离子蜂窝排列。为了更好地理解LDHs的性质，我们提出了一个将有序/无序排列与离子电导联系起来的重要见解。
We report herein the structural influence of in-plane cation arrangements on ion conductivities of layered double hydroxides (LDHs). Mg-Al-CO3 and Mg-Ga-CO3 LDHs with different proportions of trivalent cations were synthesized by the co-precipitation method, and we found that their ion conductivities presented a steep increase only at peculiar proportions of trivalent cations. Electron-beam diffraction patterns revealed that LDHs with such proportions had an ordered honeycomb arrangement of di- and trivalent cations in (0001) hydroxide layers. We propose a crucial insight that relates the order/disorder arrangement and ion conductivities for better understanding the nature of LDHs.