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Title: Magnetic phenomena in co-containing layered double hydroxides
Author: Vieira, Daniel E. L.
Salak, Andrei N.
Fedorchenko, Alexey V.
Pashkevich, Yurii G.
Fertman, Elena L.
Desnenko, Vladimir A.
Babkin, Roman Yu.
Čižmár, Erik
Feher, Alexander
Lopes, Augusto B.
Ferreira, Mário G. S.
Keywords: Layered structure
Oxygen octahedra
Static magnetization,
Effective magnetic moment
Issue Date: 1-Aug-2017
Publisher: AIP Publishing
Abstract: Magnetic behavior of CoII(n)AlIII layered double hydroxides (LDHs) (n=Co/Al=2 and 3) intercalated with nitrate was studied as a function of temperature. Both LDH compounds are paramagnetic above about 8K. A rapid increase of their magnetic moments occurs below this temperature until the moments reach the maximum values at Tmax of 4.0K and 3.2K for Co(2)Al-NO3 and Co(3)Al-NO3, respectively. Below Tmax, the zero-field-cooled and the field-cooled static magnetization curves are strongly different. Along with this low-temperature phenomena, Co(2)Al-NO3 and Co(3)Al-NO3 demonstrate anomalous behavior of their temperature dependence magnetic susceptibility in a highertemperature range: between 75 and 175K, both the paramagnetic Curie temperature and the effective magnetic moment change in a non-monotonous way. Possible structural reasons of the observed magnetic behavior of the CoII(n)AlIII LDHs are discussed.
Peer review: yes
DOI: 10.1063/1.5001299
ISSN: 1063-777X
Appears in Collections:CICECO - Artigos

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