Structural, electrical, and dielectric properties of nickel-doped spinel LiMn2O4 nanorods

• Published in: Ionics Vol. 25; no. 3; pp. 981 - 990
• Main Authors: Nageswara, Rao B, Narsimulu, D, Srinadhu, E S, Satyanarayana, N
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2019; Springer Nature B.V
• Subjects: Chemical synthesis; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Crystal structure; Dielectric properties; Doping; Electrical resistivity; Electrochemistry; Energy Storage; Fourier transforms; Lithium manganese oxides; Manganese; Morphology; Nanorods; Nickel; Optical and Electronic Materials; Original Paper; Raman spectroscopy; Renewable and Green Energy; Spectrum analysis; Spinel; Transmission electron microscopy; X-ray diffraction; Ni-doped LiMn; Electrical conductivity; nanorods; Dielectric properties; X-ray diffraction (XRD); Microwave synthesis; Transmission electron microscopy (TEM); O
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-018-2697-x

Spinel pure and Ni-doped LiMn 2 O 4 nanorods were synthesized by a rapid microwave-assisted hydrothermal process followed by a solid-state reaction method. Their structural, morphological, electrical, and dielectric properties were investigated by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, transmission electron microscopy (TEM), and impedance spectroscopy techniques. Powder XRD studies revealed that all the synthesized samples have well-defined cubic crystal structure and the Ni 2+ doping in manganese sites did not affect spinel LiMn 2 O 4 structure. TEM images of pure and Ni-doped LiMn 2 O 4 samples clearly showed the formation of well-dispersed nanorods with uniform distribution. The Ni 2+ doping did not affect the nanorod morphology of pure LiMn 2 O 4 . The spinel LiMn 2 O 4 nanorods showed an electrical conductivity of 3.13 × 10 −4  S cm −1 , at room temperature. The A.C conductivity studies revealed that the pure and Ni-doped LiMn 2 O 4 nanorods obey Jonscher’s power law. The dielectric studies revealed that the dielectric constant of the samples decreases with frequency, which is due to decrease in charge accumulation at the interface.