Magnetic properties of Mg/Co(II)–Al/Fe(III) layered double hydroxides

Li, Qiuhang; Liu, Xing; Lu, Xiaofeng; Li, Na; Xu, Mingxiang

doi:10.1016/j.inoche.2014.12.014

Cited by 14 publications

(9 citation statements)

References 25 publications

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“…There are two opposite opinions in the literature as to the nature of the ferromagnetism of cobalt-iron LDHs. It was reported by Li et al [9] that room-temperature ferromagnetism was only observed in samples containing more than 50 at % cobalt and iron on the sites of doubly and triply charged cations, respectively. They interpreted the ferromagnetism of the obtained LDHs in terms of the coexistence of Co 2+ -O 2--Co 2+ ferromagnetic interactions and Co 2+ -O 2--Fe 3+ and Fe 3+ -O 2--Fe 3+ antiferromagnetic interactions.…”

Section: Resultsmentioning

confidence: 93%

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Effect of the Synthesis Method on the Phase Composition and Magnetism of Layered Double Hydroxides

et al. 2020

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A number of tetrametallic layered double hydroxides containing magnesium and cobalt on the site of doubly charged cations in the structure of brucite-like layers and aluminum and iron on the site of triply charged cations have been synthesized using three distinct methods: coprecipitation, microwave synthesis, and hydrothermal crystallization. A sodium hydroxide solution was used as a precipitant. The results demonstrate that all three methods yield a well-crystallized hydrotalcite-like layered hydroxide and an impurity phase. We believe that it is the impurity phase which is responsible for the magnetism of the materials. Most likely, this phase is spinel CoFe 2 O 4 .

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Section: Resultsmentioning

confidence: 93%

“…Considerable attention has been attracted by the possibility of preparing LDHs having magnetic properties. Such an effect is observed if both iron and cobalt cations are present in the system [9].…”

Section: Introductionmentioning

confidence: 93%

Effect of the Synthesis Method on the Phase Composition and Magnetism of Layered Double Hydroxides

et al. 2020

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“…This class of compounds is notable because of their comparative lightness and the broad variation range of both the cationic and anionic compositions, which stimulates the formation of samples possessing catalytic [3][4][5], magnetic [6], electrical [7], and other properties [8].…”

Section: Methodsmentioning

confidence: 99%

Magnetic Materials Based on Layered Double Hydroxides

et al. 2021

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Composite materials that contain tetracationic hydrotalcite-like layered double hydroxide and a cobalt-iron spinel phase were prepared by coprecipitation from a solution of a mixture of magnesium, aluminum, cobalt(II), and iron(III) salts followed by hydrothermal treatment. The iron and cobalt contents in the samples were varied within a broad range. The thermal transformations of the prepared composites were examined by hightemperature X-ray diffraction, and the layered hydroxide phase was found to remain when heated up to 300°C. The specifi c magnetization and magnetic susceptibility of the materials were determined using a vibrating sample magnetometer; a rise in the iron and cobalt contents was found to increase the magnetization up to a certain limit. The obtained samples can be used as magnetic sorbents. The sorption capacity of materials was estimated using Congo red anionic dye as an example.

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“…, where M 2+ and M 3+ are metal ions located in octahedral positions of brucite-like layers, and A n− stands for inorganic or organic anions that compensate the positive charge of brucite-like layers [1,2]. The structural features of hydrotalcite-like compounds give them a number of specific ion-exchange [3][4][5], sorption [6][7][8], electrical [9][10][11], catalytic [12][13][14], and magnetic properties [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Synthesis Method on Properties of Layered Double Hydroxides Containing Ni(III)

2021

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Unstable oxidation state +3 of nickel can be stabilized in the structure of layered double hydroxides, the resulting crystallinity and properties being dependent on the synthesis method. Three different wet chemical methods (co-precipitation at variable pH, co-precipitation followed by hydrothermal treatment, co-precipitation with microwave treatment) were used to synthesize Mg/Ni–Al layered double hydroxides containing triply charged nickel cations. Lattice parameters of the samples synthesized by various methods were found to differ from each other by about 1.5%. The most crystallized sample was obtained by hydrothermal synthesis. The oxidation state of nickel in the LDH samples was confirmed by XPS. TEM mapping gave evidence of the uniform distribution of nickel in all the samples. The LDHs’ reduction with hydrogen and thermal transformations of the phase composition and morphology of LDHs were studied in detail. The properties of the samples synthesized by the different methods were shown to be quite similar.

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Magnetic properties of Mg/Co(II)–Al/Fe(III) layered double hydroxides

Cited by 14 publications

References 25 publications

Effect of the Synthesis Method on the Phase Composition and Magnetism of Layered Double Hydroxides

Effect of the Synthesis Method on the Phase Composition and Magnetism of Layered Double Hydroxides

Magnetic Materials Based on Layered Double Hydroxides

Effect of Synthesis Method on Properties of Layered Double Hydroxides Containing Ni(III)

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