Dielectric properties of Bi-substituted LDHs synthesized by co-precipitation and sol-gel methods


Magnesium-aluminum-bismuth layered double hydroxides (Mg3Al1-xBix; LDHs) were prepared using both co-precipitation and sol-gel methods. For the preparation of Mg/Al/Bi LDH by the co-precipitation method, the appropriate amounts of dissolved starting materials (Al(NO3)(3) center dot 9H(2)O, Mg(NO3)(2) center dot 6H(2)O and Bi(NO3)(3) center dot 5H(2)O) were mixed with a solution of NaHCO3:NaOH. In the sol-gel processing, the precursor Mg-Al-Bi-O gels were synthesized using the same starting materials and ethylene glycol as complexing agent. The mixed-metal oxides obtained by subsequent heating of Mg-Al-Bi-O gels at 650 degrees C were reconstructed to Mg3Al1-xBix LDHs in water at 80 degrees C. All the synthesized products were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and dielectric measurements.



subject category

Materials Science


Sokol, D; Ivanov, M; Salak, AN; Grigalaitis, R; Banys, J; Kareiva, A

our authors


The work has been done in frame of the project TUMOCS: Tuneable Multiferroics Based on Oxygen Octahedral Structures. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 645660.

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