Magnetodielectric effect in Ni0.5Zn0.5Fe2O4�?�BaTiO3 nanocomposites

Bulletin of materials science

Dipankar Chakravorty²  Shilpi Banerjee⁴  Sri Bandyopadhyay⁵  Mykanth Reddy Mada⁵  Partha Hajra²  Asim Bhaumik³  Anindya Datta¹ 

[1] University School of Basic and Applied Science (USBAS), Guru Govind Singh Indraprastha University, New Delhi, India$$University School of Basic and Applied Science (USBAS), Guru Govind Singh Indraprastha University, New Delhi, IndiaUniversity School of Basic and Applied Science (USBAS), Guru Govind Singh Indraprastha University, New Delhi, India$$;MLS Professor’s Unit, Indian Association for the Cultivation of Science, Kolkata 700032, India$$MLS Professor’s Unit, Indian Association for the Cultivation of Science, Kolkata 700032, IndiaMLS Professor’s Unit, Indian Association for the Cultivation of Science, Kolkata 700032, India$$;Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India$$Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700 032, IndiaDepartment of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India$$;MLS Professor’s Unit, Indian Association for the Cultivation of Science, Kolkata 700032, India$$Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India$$MLS Professor’s Unit, Indian Association for the Cultivation of Science, Kolkata 700032, IndiaMLS Professor’s Unit, Indian Association for the Cultivation of Science, Kolkata 700032, India$$Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India$$Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700 032, IndiaMLS Professor’s Unit, Indian Association for the Cultivation of Science, Kolkata 700032, India$$Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India$$;School of Materials Science and Engineering, University of New South Wales, Kensington, Sydney-2052, Australia$$School of Materials Science and Engineering, University of New South Wales, Kensington, Sydney-2052, AustraliaSchool of Materials Science and Engineering, University of New South Wales, Kensington, Sydney-2052, Australia$$

关键词: Nanocomposites;    magneto-dielectric effect;    two-phase inhomogeneous medium;    Maxwellâ€�?�Wagner effect.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Composites comprising of nanoparticles of Ni_0.5Zn_0.5Fe₂O₄ (NZF) and BaTiO₃ (BT), respectively were synthesized by a chemical method. The particles had diameters in the range of 15â€�??31 nm. NZF was prepared by a coprecipitation technique. This was soaked in a sol containing BT. Compositions synthesized were 𝑥NZF-(1 - ð‘�?) BT, where ð‘�? = 0.7, 0.5 and 0.3, respectively. The composites showed ferromagnetic hysteresis loops due to NZF phase. The analysis of coercivity variation as a function of temperature gave blocking temperatures in the range of 306â€�??384 K depending on the diameter of the ferrite nanoparticles. This implied that superparamagnetic interactions are above these temperatures. The nanocomposites also exhibited ferroelectric behaviour arising due to the presence of BT. The remanent polarization of the samples was small. This was adduced to the nanosize of BT. The specimens showed magneto-dielectric (MD) effect in the magnetic field range 0â€�??0.7 Tesla. The MD parameter measured at the maximum magnetic field was around 2\%. This was one order of magnitude higher than that reported so far in similar composite systems. This was explained on the basis of a two-phase inhomogeneous medium model with an interface between them, the phases possessing drastically different electrical conductivities.

【 授权许可】

Unknown