论文标题
固体解决方案中的Na-ion动力学Na $ _ {\ rm x} $ ca $ _ {1- \ rm x} $ cr $ _2 $ _2 $ o $ _4 $由Muon Spin Rotation and Neutron Diffaction研究
Na-ion Dynamics in the Solid Solution Na$_{\rm x}$Ca$_{1- \rm x}$Cr$_2$O$_4$ Studied by Muon Spin Rotation and Neutron Diffraction
论文作者
论文摘要
在这项工作中，我们介绍了通过MUON自旋旋转/放松（$μ^+$ SR）和中子粉末衍射（NPD）进行的系统测量集，并在实心解决方案Na $ _ {\ rm X} $ ca $ _ {1- \ rm x} $ _ x} $ CR $ _2 $ _2 $ o $ _4 $ _4 $ $ _4 $ $ _4 $ _4 $ _4 $ _4 $ _ {\ rm x} $ ca $ _ {\ rm x} $ ca $ _ {\ rm x} $ ca $ _ {这项研究调查了由CRO $ _6 $ octahedra的蜂窝样布置产生的准1D（Q1D）扩散通道中的Na-ion动力学，在存在CA掺杂引入的缺陷的情况下。随着CA含量的增加，扩散通道的大小被扩大，但是，这种效果不会增强NA离子的迁移率。取而代之的是，总体扩散率受到局部缺陷的阻碍，而NA跳跃概率降低了。 Na $ _ {\ rm x} $ CA $ _ {1- \ rm x} $ CR $ _2 $ o $ $ _4 $中的扩散机制被发现是间隙，并且为所有实心解决方案成员确定了激活能量以及扩散系数。
In this work we present systematic set of measurements carried out by muon spin rotation/relaxation ($μ^+$SR) and neutron powder diffraction (NPD) on the solid solution Na$_{\rm x}$Ca$_{1- \rm x}$Cr$_2$O$_4$. This study investigates Na-ion dynamics in the quasi-1D (Q1D) diffusion channels created by the honeycomb-like arrangement of CrO$_6$ octahedra, in the presence of defects introduced by Ca doping. With increasing Ca content, the size of the diffusion channels is enlarged, however, this effect does not enhance the Na ion mobility. Instead the overall diffusivity is hampered by the local defects and the Na hopping probability is lowered. The diffusion mechanism in Na$_{\rm x}$Ca$_{1- \rm x}$Cr$_2$O$_4$ was found to be interstitial and the activation energy as well as diffusion coefficient were determined for all the members of the solid solution.
