Reversed (Negative) Magnetization for Electrochemically Deposited High-Tc Thin Films of Chromium Hexacyanide Magnets
Reversed (Negative) Magnetization for Electrochemically Deposited High-Tc Thin Films of Chromium Hexacyanide Magnets
复制标题
电化学沉积六氰化铬磁体高温薄膜的反向（负）磁化
DOI：
10.1021/cm970773v
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发表时间：
1998
影响因子：
8.6
通讯作者：
Joel S A Miller
中科院分区：
文献类型：
--
作者：
W. Buschmann;S. Paulson;C. Wynn;M. Gîrțu;A. Epstein;H. White;Joel S A Miller
类似氰化铬普鲁士蓝材料的薄膜 KnCrx[Cr(CN)6]（厚度约 1.0 ± 0.5 μm）以非晶态 (a) 和晶态 (α) 形式电沉积在玻碳电极上。晶体薄膜显示出典型的面心立方 (fcc) 普鲁士蓝型立方晶格 [a = 10.41(2) A] 的 X 射线衍射图。这些薄膜表现出准可逆循环伏安波、SEM 图像中独特的形态以及强场依赖性磁性行为。薄膜经历了两个单电子过程，CrII[CrII(CN)6]2- ⇌ CrIII[CrII(CN)6]- + e-，和 CrIII[CrII(CN)6]- ⇌ CrIII[CrIII(CN)6] + e-，存在一些残留的 CrII。通过分析 υCN IR 数据 {[CrII(CN)6]4-: υCN = 2072s cm-1； [CrIII(CN)6]3-: υCN = 2185m cm-1} 和 X 射线光电子 (XPS) 光谱数据。对于非晶态和晶态，氧化膜和还原膜的成分分别为 CrIII[CrIII(CN)6]0.98[CrII(CN)6]0.02 和 K2.0CrII[CrII(CN)6]。这些 ...
Thin films of chromium cyanide Prussian blue-like materials, KnCrx[Cr(CN)6] (ca. 1.0 ± 0.5 μm thick) are electrodeposited on glassy carbon electrodes in amorphous (a) and crystalline (α) forms. The crystalline film shows a X-ray diffraction pattern typical of a face-centered cubic (fcc) Prussian blue-type cubic lattice [a = 10.41(2) A]. The films exhibit quasi-reversible cyclic voltammetric waves, distinct morphologies in SEM images, and strong field-dependent magnetic behavior. The films undergo two one-electron processes, CrII[CrII(CN)6]2- ⇌ CrIII[CrII(CN)6]- + e-, and CrIII[CrII(CN)6]- ⇌ CrIII[CrIII(CN)6] + e-, with some residual CrII being present. The composition is determined from an analysis of the υCN IR data {[CrII(CN)6]4-: υCN = 2072s cm-1; [CrIII(CN)6]3-: υCN = 2185m cm-1} and X-ray photoelectron (XPS) spectral data. The composition of the oxidized and reduced films are CrIII[CrIII(CN)6]0.98[CrII(CN)6]0.02 and K2.0CrII[CrII(CN)6], respectively, for both amorphous and crystalline forms. These ...