Kumari, K. and Ram, S. and Kotnala, R. K. (2011) Frequency-temperature dependent dynamics of dielectrics in ferric oxoborate Fe3BO6 of cocktail structure of nanorods. Philosophical Magazine Letters, 91 (7). pp. 498-509. ISSN 0950-0839

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Oxoborates have both dielectric and magnetic properties useful for magnetodielectric devices, sensors, or biological tools. Such compounds Fe2BO4, Fe3BO5, or Fe3BO6 are known to grow easily as single crystals in a liquid flux. A polycrystalline phase forms only on controlled conditions of a solid state reaction of the basic oxides. In this study, we report highly dielectric Fe3BO6 when grown in a specific shape of nanorods (200 nm diameter and 50–100 µm length) from an iron borate glass, which offers devisable shapes of sheets, discs, and fibers. Frequency (f)-temperature reliant dynamics of dielectric constant εr is studied over 25–300°C at 0.1–103 kHz frequencies. At low frequency such as 100 Hz, a large εr -value 40,000, better than most of high εr -value ferroelectrics, incurs at room temperature. At f ≥ 50 kHz, although only an order of diminished εr -value lasts, it increases steadily with temperature, possibly due to increasing electrical conductivity in a specific resistor–capacitor network. Suppressed dielectric relaxation and spin-flops share a merely weak spin-reorientation transition near 160°C. A stable power loss ≤0.5 lasts at f > 10 kHz useful for possible applications of magnetodielectric materials.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Taylor & Francis Group.
Uncontrolled Keywords: magnetodielectric materials; oxoborates; microstructure; nanoceramics; dielectric materials
Subjects: Applied Physics/Condensed Matter
Depositing User: Mr. Abhishek Yadav
Date Deposited: 18 Dec 2012 07:08
Last Modified: 18 Dec 2012 07:08
URI: http://npl.csircentral.net/id/eprint/910

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