Abstract
Tailoring of electromagnetic (EM) parameters has become increasingly important for EM waves propagation, absorption and shielding applications. Single-phase La0.7Sr0.3Mn1-yCoyO3 (LSMCO, y = 0, 0.3, 0.5, and 1.0) have been prepared by a sol-gel process followed by cold pressing and sintering. The effect of Co doping on the electromagnetic properties of LSMO has been investigated. Plasma-like negative permittivity (\(\varepsilon_{r}^{\prime }\) < 0) and negative susceptibility (\(\mu_{r}^{\prime }\) < 1) appear simultaneously in La0.7Sr0.3MnO3 (y = 0, LSMO). The negative permittivity for frequencies ranging from 0.01 to 1 GHz results from plasma oscillation of conduction electrons in LSMO, and the frequency dispersion agrees well with the Drude model. A higher positive permittivity was also obtained with increasing Co content, indicating a wide adjustment range of permittivity from − 1.3 × 104 to 2.9 × 104, which represents an important step toward the development of new capacitors with a higher capacitance for integrated circuit. Furthermore, tunable negative susceptibility is observed for LSMO and La0.7Sr0.3CoO3 (y = 1.0, LSCO) samples over frequency ranges of 0.1–1 GHz and 0.01–1 GHz, respectively. These results open the door for the realization of tunable negative electromagnetic properties in single-phase perovskites, which is of great significance for the development of negative parameters materials.
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This research was supported by the Natural Science Foundation of China (Nos. 51902154, 51772150), Key Research and Development Program of Jiangsu Province (No. BE2018008-1). The authors also acknowledge to Prof. Arunava Gupta for his experimental help and the preparation of manuscript.
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Yan, K., Shen, L., Fan, R. et al. Tailoring the electromagnetic properties of perovskite La0.7Sr0.3MnO3 ceramics by Co doping. J Mater Sci 56, 10183–10190 (2021). https://doi.org/10.1007/s10853-021-05813-5
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DOI: https://doi.org/10.1007/s10853-021-05813-5