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Non-magnetic impurity doping effect on the magnetic state of p-type Al-doped delafossite oxide CuCrO2

100%
Jlaiel F., Amami M., Strobel P., Salah A.
Open Chemistry
|
2011
|
vol. 9
|
issue 5
953-958
EN
We investigated the substitution effects of Al3+ for Cr3+ on the structure and magnetic, properties of delafossite oxide CuCrO2, which possesses a quasi-2D Heisenberg triangular antiferromagnetic (AFM) lattice. The lattice parameters was found to vary according to the Vegard’s rule. We also found that the large local lattice distortion, caused by the nonmagnetic dopant with different radii between magnetic and nonmagnetic ions, affects the samples significantly. Magnetization and specific heat measurements indicated that AFM ordering is diluted by the substitution of nonmagnetic Al3+ for Cr3+ (S = 3/2). [...]
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Development of FeOOH nanoarrays using magnetic cations

88%
Garcia-Casillas P., Martinez-Pérez C., González C., Camacho-Montes H., Martel Estrada S., Armendáriz I.
Open Chemistry
|
2013
|
vol. 11
|
issue 3
358-363
EN
Abstract In this work, FeOOH arrays were obtained using two different magnetic cations. The nanoparticles were grouped into a package having different orientations through the van der Waals interaction with the magnetic cations. With Fe2+, the FeOOH nanoparticles have a rod shape with a 30-nm diameter and approximately 1-micron length, and are aligned in a star structure. With Co2+, a somatoidal shape was observed, with 20-nm diameter and 150-nm length and a pathway structure to the array. The chemical synthesis method was used to obtain the nanoarrays. The morphology and the average size of the nanorods and nanowires were determined using Field Emission Scanning Electron Microscopy (FESEM). Fourier Transform Infrared Spectroscopy (FTIR) was used to study the interaction between the nanorods and the cobalt ions. The phases of the material were identified using X-ray Diffraction. Graphical abstract [...]
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