Preparation and High-Frequency Dielectric Properties of Cu/SiO₂ Composites

Abstract:

In this paper, Cu/SiO₂ composites with different metal contents were successfully prepared by a selective reduction process. The phase composition and microstructure of composites were analyzed by XRD and SEM, respectively. The results show that spherical copper particles are uniformly distributed in silica matrix. The impedance and permittivity of composites were tested with RF impedance analyzer (0.1~1 GHz). It is indicated Cu/SiO₂ composites exhibit capacitive character. In addition, the dielectric constants get enlarged due to the enhancement of interface polarization.

• Periodical: Key Engineering Materials (Volume 655)
• Pages: 174-177
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.655.174
• Online since: July 2015
• Authors: Kai Sun, Run Hua Fan*, Zi Dong Zhang, Xi Hua Zhang, Ke Lan Yan, Min Chen
• Keywords: Composite, Dielectric Property, Negative Permittivity, Selective Reduction

References

[1] X. Deng, N. Chawla, K.K. Chawla, et al. Mechanical Behavior of Multilayered Nanoscale Metal-Ceramic Composites, Ad. Eng. Mater. 7 (2005) 1099-1108.

DOI: 10.1002/adem.200500161

[2] T.W. Noh, Y. Song, S.I. Lee, et al. Percolation effects in the optical properties of Ni-MgO composites, Phys. Rev. B. 33 (1986) 3793.

DOI: 10.1103/physrevb.33.3793

[3] K. Takagi, Development and application of high strength ternary boride base cermets, J. Solid State Chem. 179 (2006) 2809-2818.

DOI: 10.1016/j.jssc.2006.01.023

[4] A. Kawasaki, R. Watanabe, Thermal fracture behavior of metal/ceramic functionally graded materials, Eng. Frac. Mech. 69 (2002) 1713-1728.

DOI: 10.1016/s0013-7944(02)00054-1

[5] M.W. Finnis, The theory of metal-ceramic interfaces, J. Phys-Condens. Mat. 32 (1996) 5811.

[6] X.A. Wang, Z.C. Shi, M. Chen, et al. Tunable Electromagnetic Properties in Co/Al2O3 Cermets Prepared by Wet Chemical Method, J. Am. Ceram. Soc. (2014).

[7] B. Zhang, Y. Feng, J. Xiong, et al. Microwave-absorbing properties of de-aggregated flake-shaped carbonyl-iron particle composites at 2-18 GHz, IEEE T. Magn. 42 (2006) 1778-1781.

DOI: 10.1109/tmag.2006.874188

[8] S. Kirihara, M.W. Takeda, K. Sakoda, et al. Control of microwave emission from electromagnetic crystals by lattice modifications, Solid state commun. 124 (2004) 135-139.

DOI: 10.1016/s0038-1098(02)00452-0

[9] K.L. Yan, R.H. Fan, Z.C. Shi, et al. Negative permittivity behavior and magnetic performance of perovskite La 1− x Sr x MnO 3 at high-frequency, J. ournal of Mater. Chem. C, 6 (2014) 1028-1033.

DOI: 10.1039/c3tc31906g

[10] M. Gao , Z.C. Shi, R.H. Fan, et al. High-Frequency Negative Permittivity from Fe/Al2O3 Composites with High Metal Contents, J. Am. Ceram. Soc. 95 (2012) 67-70.

DOI: 10.1111/j.1551-2916.2011.04963.x

[11] A.K. Jonscher, Dielectric relaxation in solids, J. Phys. D. Appl. Phys. 32 (1999) R57.