Open Access Open Access  Restricted Access Subscription or Fee Access

Dielectric Studies on Magneto-elastomer Composites Filled with Soft Ferrites

Prema. K. H


Magneto-elastomer composites are flexible magnetic composites which can be synthesized by incorporating ferrites into elastomers. These composite materials are in par with their ceramic counter parts and are potential substitute for ferrites in various applications. Advantage of these materials is the processability and mouldability into desired shapes. Dielectric property of elastomers is modified with the incorporation of soft ferrites like nickel ferrite. They can be used as microwave absorbing materials. EPDM based magneto-elastomeric composites are prepared with various weight fraction of nickel ferrite. Physical properties such as dielectric and magnetic properties are evaluated. The observed data indicates that frequency dependence of the dielectric constant follows Maxwell-Wagner interfacial polarization. Dielectric and magnetic properties of these composites increase with an increase in volume fraction of the magnetic filler. Some mixture equations are applied to correlate the dielectric permittivity of matrix, filler, and composites. Dielectric constant of nickel ferrite increases with increase in temperature. Temperature dependence of dielectric constant of rubber ferrite composites shows a decrease in these values with increase in temperature. AC conductivity studies of the ceramic filler and composites are also conducted from the measured data. The results arrive at the conclusion that magnetic and dielectric properties of rubber ferrite composites can be tailored by proper loading and a judicious choice of the magnetic filler


Composites, elastomer composites, ferrite, rubber ferrite composites, dielectric permittivity

Full Text:



Ismail H, Sam ST, Mohd Noor AF, Bakar AA. Properties of ferrite-filled natural rubber composites. Polym Plast Technol Eng. 2007 Jun 1;46(6):641–50. doi: 10.1080/03602550701305054.

Kruželák J, Sýkora R, Dosoudil R, Hudec I. Rubber composites based on polar elastomers with incorporated modified and unmodified magnetic filler. Adv Mater Sci Eng. 2016 Jan 1;2016:1–10. doi: 10.1155/2016/7242891.

Makled MH. Dielectric properties of high coercivity barium ferrite–natural rubber composites. J Appl Polym Sci. 2012 Nov 5;126(3):969–73. doi: 10.1002/app.34663.

Solomon MA, Kurian P, Joy PA, Anantharaman MR. Processability and magnetic properties of rubber ferrite composites containing barium ferrite. International Journal of Polymeric Materials and Polymeric Biomaterials. 2004 Jul 1;53(7):565–75. doi: 10.1080/00914030490461685.

Soloman MA, Kurian P, Anantharaman MR. Dielectric and mechanical properties of rubber ferrite composites containing barium ferrite. Prog Rubber Plast Recy Technol. 2002 Nov;18(4):269–82. doi: 10.1177/147776060201800404.

Kruželák J, Kvasničáková A, Hložeková K, Dosoudil R, Gořalík M, Hudec I. Electromagnetic interference shielding and physical-mechanical characteristics of rubber composites filled with manganese-zinc ferrite and carbon black. Polymers. 2021 Jan;13(4):616. doi: 10.3390/polym13040616.

Anantharaman MR, Malini KA, Sindhu S, Mohammed EM, Date SK, Kulkarni SD et al. Tailoring magnetic and dielectric properties of rubber ferrite composites containing mixed ferrites. Bull Mater Sci. 2001 Jan;24(6):623–31. doi: 10.1007/BF02704011.

Anantharaman MR, Sindhu S, Jagatheesan S, Malini KA, Kurian P. Dielectric properties of rubber ferrite composites containing mixed ferrites. J Phys D: Appl Phys. 1999 Aug 7;32(15):1801–10. doi: 10.1088/0022–3727/32/15/307.

Kulkarni SR, Kanamadi CM, Chougule BK. Magnetic and dielectric properties of Ni. 8Co0. 1Cu0. 1Fe2O4+ PZT composites. J Phys Chem Solids. 2006 Aug 1. 1607–11;67(8):0.

George M, Nair SS, John AM, Joy PA, Anantharaman MR. Structural, magnetic and electrical properties of the sol-gel prepared Li0. 5Fe2. 5O4 fine particles. J Phys D: Appl Phys. 2006 Feb 17;39(5):900–10. doi: 10.1088/0022–3727/39/5/002.

Koops CG. On the dispersion of resistivity and dielectric constant of some semiconductors at audiofrequencies. Phys Rev. 1951 Jul 1;83(1):121–4. doi: 10.1103/PhysRev.83.121.

Maxwell J. Electricity and magnetism, Volume 1. section 328. London: Oxford University Press; 1873.

Wagner KW. Zur Theorie der unvollkommenen Dielektrika. Ann Phys. 1913;345(5):817–55. doi: 10.1002/andp.19133450502.

Iwauchi K. Dielectric properties of fine particles of Fe3O4 and some ferrites. Jpn J Appl Phys. 1971 Nov 1;10(11):1520–8. doi: 10.1143/JJAP.10.1520.

EI Hiti MA, Abdeen AM. Electric, dielectric, and thermoelectric properties of zinc substituted Ni-Mg ferrites. Mater Sci Technol:1998.14(5):417–421.

Choi HD, Shim HW, Cho KY, Lee HJ, Park CS, Yoon HG. Electromagnetic and electromagnetic wave‐absorbing properties of the SrTiO3–epoxy composite. J Appl Polym Sci. 1999 Apr 4;72(1):75–83. doi: 10.1002/(SICI)1097–4628(19990404)72:1<75::AID-APP8>3.0.CO;2-T.

Wagner KW. Erklärung der dielektrischen nachwirkungsvorgänge auf grund maxwellscher Vorstellungen. Archiv f Elektrotechnik. 1914 Sep;2(9):371–87. doi: 10.1007/BF01657322.


  • There are currently no refbacks.