resumo
Distortions of hydroxide octahedral complexes in the (ConAlIII)-Al-II layered double hydroxides (LDHs) (n = Co-II/Al-III = 2 and 3) were studied as a function of the ratio of divalent-to-trivalent cations and temperature. A method for calculation the magnetic susceptibility of polycrystalline samples taking into account the statistical distribution of divalent and trivalent cations, and their effect on the distortions of the original structure is proposed. It is shown that the presence of a local maximum on the magnetic susceptibility curve of ConAl LDHs compounds near T similar to 160 K is due to freezing of the lattice parameters and, as a consequence, freezing of the tilting fluctuations of the O-H bonds.
palavras-chave
ORDER
categoria
Materials Science; Physics
autores
Babkin, RY; Pashkevich, YG; Fedorchenko, AV; Fertman, EL; Desnenko, VA; Prokhvatilov, AI; Galtsov, NN; Vieira, DEL; Salak, AN
nossos autores
Andrei Salak
Investigador Principal
Daniel Eduardo Loureiro Vieira
Estudante de doutoramentoGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
agradecimentos
The work reported has been done in frame of the project TUMOCS. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 645660. The financial support of P2020 COMPETE and FCT-Portugal grants through project POCI-01-0145-FEDER-016686 - PTDC/CTM-NAN/2418/2014 (NANOCONCOR) is also acknowledged.