Bombardment Induced Transport of Rb+ through a K+ Conducting Glass vs. K+ Transport through a Rb+ Conducting Glass
Bombardment Induced Transport of Rb+ through a K+ Conducting Glass vs. K+ Transport through a Rb+ Conducting Glass
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DOI：
10.1515/zpch-2014-0459
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发表时间：
2014-01-01
影响因子：
2.5
通讯作者：
Weitzel, Karl-Michael
中科院分区：
文献类型：
--
作者：
Budina, David;Zakel, Julia;Weitzel, Karl-Michael
用低能轰击诱导离子输运（BIT）方法研究了铷离子和钾离子分别通过铷和钾离子导电玻璃的输运。这里，轰击离子M-1（Rb+，K+）和电荷载流子离子M-2（Rb+，K+）的组合，简称M-1@M-2，定义了一个2 × 2矩阵，其中对角元素指的是原生离子输运，Rb+@Rb+和K+@K+，而非对角元素指的是外来离子输运，Rb+@K+和K+@Rb+。后者对应于铷离子通过钾离子导体的传输，反之亦然。原生离子BIIT产生的固有的离子电导率和离子跳跃的活化能与阻抗谱数据也提出。外来离子BIIT导致产生的扩散曲线高达100 nm的玻璃样品所揭示的飞行时间二次离子质谱（ToF-SIMS）。通过能斯特-普朗克-泊松理论对这种深度分布进行分析，可以获得扩散系数的浓度依赖性。钾离子扩散系数D（K+）的浓度依赖性对于铷玻璃与钾玻璃基质是显著不同的。在误差条内，铷离子扩散系数D（Rb+）的浓度依赖性在两种玻璃中可忽略不计。
The transport of rubidium ions and potassium ions respectively through rubidium and potassium ion conducting glasses has been investigated by means of the recently developed low energy bombardment induced ion transport (BIT) approach. Here, the combination of a bombarder ion M-1 (Rb+,K+) and a charge carrier ion M-2 (Rb+,K+), in short M-1@M-2, defines a 2 x 2 matrix where the diagonal elements refer to the native ion transport, Rb+@Rb+ and K+@K+ while the off-diagonal elements refer to foreign ion transport, Rb+@K+ and K+@Rb+. The latter corresponds to the transport of rubidium ions through a potassium ion conductor and vice versa. The native ion BIIT yields the intrinsic ionic conductivities and activation energies for ion hopping in line with impedance spectroscopic data also presented. The foreign ion BIIT leads to the generation of diffusion profiles up to 100 nm into the glass sample as revealed by time-of-flight secondary ion mass spectrometry (ToF-SIMS). The analysis of such depth profiles by means of Nernst Planck-Poisson theory provides access to the concentration dependence of the diffusion coefficients. The concentration dependence of the potassium ion diffusion coefficient, D(K+), is markedly different for the rubidium glass vs. the potassium glass matrix. Within the error bars the concentration dependence of the rubidium ion diffusion coefficient, D(Rb+), is negligible in both glasses.