Synthesis and characterization of BaNiO$_3$ using a solid-state thermal decomposition method and the preparation of its stable aqueous suspension

[摘要] In the present study, the preparation of BaNiO$_3$ nano-oxide is reported via simple solid-state thermal decompositionof [Ba(en)$_4$][Ni(H$_2$O)$_2$(NCS)$_4$] precursor complex for the first time. As-prepared nano-oxide was coated by citricacid to form a stable aqueous magnetic suspension. The precursor complex was characterized by conductivity measurements,ultra violet–visible spectroscopy, elemental analysis and Fourier transform infrared spectroscopy. The composition of theperovskite was confirmed by energy-dispersive X-ray spectroscopy analysis and the hexagonal structure was supported bypowder X-ray diffraction. In addition, monotonous morphology of the nano-oxide was illustrated by field-emission scanningelectron microscopy. Superparamagneticity of the nanoparticles were detected using a vibrating sample magnetometer.Finally, the hydrodynamic size as well as the zeta potential of the pristine and surface-treated BaNiO$_3$ nano-oxide weremeasured in deionized water via a dynamic light scattering analyzer and they were compared. Results show the excellentstability of the surface-modified magnetic oxide compared to the pristine.

[学科分类] 材料工程

[关键词] Oxides;perovskite;magnetic fluid;XRD;SEM;VSM.