Orientation of Co2+ and Cu2+ ions introduced L-type zeolite observed with a magnetic field

IF 4.8 3区 材料科学 Q1 CHEMISTRY, APPLIED
Anna Nagai , Ryosuke So , Kenji Shida , Tohru S. Suzuki , Motohide Matsuda
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Abstract

L-type zeolite with Co2+ and Cu2+ ions in 3d-transition-metal ions were prepared via ion exchange. The suspension containing these zeolite was used for slip-casting under a 12 T magnetic field applied perpendicular to the substrate surface, resulting in an orientation parallel to the c-axis for Co-L and an orientation vertical to the c-axis for Cu-L. The orientation behavior was strongly affected by the magnetocrystalline anisotropy of the L-type zeolite introduced by Co2+ and Cu2+ ions. X-ray absorption fine structure and diffuse-reflectance measurements indicated that the introduced Co2+ and Cu2+ ions formed six-coordinated hydration complexes in the zeolite structure. These hydrated complexes have a distorted octahedral structure. The results suggest that the stable direction of the magnetic moment of the hydration complex at site B of L-type zeolite depends on the strain direction. The Co2+ and Cu2+ hydration complexes have different strain directions, and the difference in orientation is speculated to be due to the different stable directions of the magnetic moment within the zeolite.

Abstract Image

用磁场观察引入 L 型沸石的 Co2+ 和 Cu2+ 离子的取向
通过离子交换制备了 3d 过渡金属离子中含有 Co2+ 和 Cu2+ 离子的 L 型沸石。含有这些沸石的悬浮液在垂直于基底表面的 12 T 磁场下用于滑铸,结果 Co-L 的取向平行于 c 轴,Cu-L 的取向垂直于 c 轴。取向行为受到 Co2+ 和 Cu2+ 离子引入的 L 型沸石磁晶各向异性的强烈影响。X 射线吸收精细结构和漫反射测量表明,引入的 Co2+ 和 Cu2+ 离子在沸石结构中形成了六配位水合络合物。这些水合络合物具有扭曲的八面体结构。结果表明,L 型沸石 B 位水合络合物的磁矩稳定方向取决于应变方向。Co2+ 和 Cu2+ 水合络合物的应变方向不同,推测其取向差异是由于沸石内部磁矩的稳定方向不同。
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来源期刊
Microporous and Mesoporous Materials
Microporous and Mesoporous Materials 化学-材料科学:综合
CiteScore
10.70
自引率
5.80%
发文量
649
审稿时长
26 days
期刊介绍: Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.
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