Electromagnetic Property of La_0.7Sr_0.3MnO₃/Ag Composite at High Frequency

Abstract:

The phase structure, and electrical and magnetic properties of La_0.7Sr_0.3MnO₃ (LSMO)-x Ag (x is the mole ratio, x=0, 0.3, 0.5) composite were investigated. It is found that the sample with x=0 is single phase; the samples with x=0.3 and 0.5 present three phase composite structure of the manganese oxide and Ag. With the increasing of Ag content, the grain size of the samples increases and the grain boundaries transition from fully faceted to partially faceted. The permittivity of spectrum (10 MHz - 1 GHz) and the theoretical simulation reveal that the plasma frequency f_p increase with Ag content, due to the increasing of free electron concentration, which is further supported by the enhancement of conductivity. While for the permeability (μ_r'), the μ_r' decrease with the increasing of Ag content at low frequency range (f < 20 MHz), while at the relative high frequency range (f > 300 MHz), the μ_r' increased with Ag content. Therefore, the introduction of elemental Ag resulted in a higher μ_r' at the relative high frequency range.

• Periodical: Key Engineering Materials (Volume 655)
• Pages: 182-185
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.655.182
• Online since: July 2015
• Authors: Ke Lan Yan, Run Hua Fan*, Min Chen, Kai Sun, Xu Ai Wang, Qing Hou, Chuan Bing Cheng
• Keywords: Complex Permeability, Drude Modle, Negative Permittivity, Perovskite Structure, Sol-Gel

References

[1] V. G. Veselago: Sov. Phys. Vol. 10 (1968), p.509–514.

[2] M. S. Rill, C. Plet, M. Thiel, I. Staude, G. von Freymann, S. Linden, M. Wegener, Nat. Mater. 2008, 7, 543 – 546.

DOI: 10.1038/nmat2197

[3] D. R. Smith, W. J. Padilla, D. J. Vier, S. C. Nemat-Nasser, S. Schultz, Phys. Rev. Lett. 2000, 84, 4184.

[4] J. H. Lee, J. P. Singer, E. L. Thomas, Adv. Mater. 2012, 24, 4782–4810.

[5] Z. C. Shi , R. H. Fan , Z. D. Zhang, L. Qian, M. Gao, M. Zhang, L. T. Zheng, X. H. Zhang, L. W. Yin, Adv. Mater. 2012, 24 (17), 2349-2352.

[6] Z. C Shi, R. H. Fan, K. L. Yan, K. Sun, M. Zhang, C. G. Wang, X. F Liu, X. H. Zhang, Adv. Funct. Mater. 2013, 23: 4123–4132.

[7] Z. C. Shi, R. H. Fan, Z. D. Zhang, H. Y. Gong, J. Ouyang , Y. J. Bai, X. H. Zhang, L. W. Yin, Appl. Phys. Lett. 2011, 99, 032903.

[8] M. Gao, Z. C. Shi, R.H. Fan, L. Qian, Z. D. Zhang, J. Y Guo, J. Am. Ceram. Soc. 2012, 95(1), 67-70.

[9] Z. D. Zhang, R. H. Fan, Z. C. Shi, S. B. Pan, K. L. Yan, K. N. Sun, J. D. Zhang, X. F. Liu, X. L. Wang, S. X. Dou, J. Mater. Chem. C, 2013, 1, 79-85.

[10] K. L Yan, R. H. Fan, Z. C. Shi, M. Chen, L. Qian, Y. L. Wei, K. Sun, J. Li, J. Mater. Chem. C, 2014, 2, 1028–1033.