Abstract
In this paper, an attempt was made to synthesize LaNiO3, CeNiO3, and BaNiO3, and Ce3+ and Ba2+ co-substituted LaNiO3. These samples were further subjected to various material characterization techniques in order to evaluate their physio-chemical properties. Scanning electron microscope (SEM) images showed large chunks of aggregated nanoparticles with minute voids. The EDX-derived atomic composition deviated from the nominal composition suggesting the occurrence of multiple phases. In addition, transmission electron microscope (TEM) images revealed that the samples exhibit uneven spherical shape with a high degree of aggregation. The Fourier transformed-infrared (FT-IR) spectra of the synthesized samples show vibrations of the BO6 octahedral indicating the presence of Ni–O bonds. In addition, metal-carboxyl vibrations were identified from the peaks at 1400 and 860 cm−1. Optical diffuse reflectance spectra (DRS) showed certain peaks originating from the O2− (2p)\(\to\) Ni2+ (3d) charge transfer. The X-ray powder diffraction (XRPD) analysis revealed the existence of multiple phases for the samples CeNiO3, BaNiO3, and La(Ce, Ba)NiO3. Moreover, La(Ce, Ba)NiO3 contained four phases showing that the co-substitution of Ba2+ and Ce3+ into LaNiO3 may require more sophisticated methodologies. The sample BaNiO3 showed maximum weight loss, due to the existence of carbonate phase. The dielectric properties decreased with increasing frequency, while the ac electrical conductivity enhanced with increasing frequencies obeying the Maxwell–Wagner two-layer model in accordance with Koop’s phenomenological theory.
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The authors acknowledge the Centre for Advanced Materials Technology of RIT Bangalore for the necessary characterization facilities used in this study. A portion of this research was also performed using facilities at CeNSE, funded by Department of Information Technology, Govt. of India, located at Indian Institute of Science, Bangalore.
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Shreyas J. Kashyap: conceptualization, validation, formal analysis, investigation, data curation, writing-original draft, writing-reviewing and editing, visualization; Ravi Sankannavar: conceptualization, methodology, validation, resources, visualization; G. M. Madhu: resources, formal analysis.
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Kashyap, S.J., Sankannavar, R. & Madhu, G.M. Synthesis and Characterization of La(Ce, Ba)NiO3 Perovskite-Type Oxides. J Supercond Nov Magn 35, 2107–2118 (2022). https://doi.org/10.1007/s10948-022-06219-3
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DOI: https://doi.org/10.1007/s10948-022-06219-3