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Dielectric properties of barium magnesiotitanate ceramics, BaMg6Ti6O19

Jayanthi, S and Kutty, TRN (2006) Dielectric properties of barium magnesiotitanate ceramics, BaMg6Ti6O19. In: Materials Letters, 60 (6). pp. 796-800.

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Official URL: http://dx.doi.org/10.1016/j.matlet.2005.10.014


Phase-pure samples of barium magnesiotitanate, BaMg6Ti6O19 (BMT) are prepared by the wet chemical `gel-carbonate' method wherein the formation of BMT is complete below 950 degrees C as a result of the reaction between nanoparticles of BaCO3, MgO and TiO2. BMT powders are sintered at 1350-1450 C to dense ceramics. Extensive melting is noticed when the bulk composition falls between 0.4MgTiO(3)+0.6BaTiO(3)) and (0.6MgTiO(3)+0.4BaTiO(3)) along the MgTiO3-BaTiO3 tie-line in BaO-MgO-TiO2, phase diagram. Dielectric properties of sintered (BMT) ceramics have been investigated which showed epsilon similar or equal to 39 at 2 GHz, quality factor Q >= 10,000 and positive temperature coefficient of dielectric constant around 370 ppm degrees C-1.

Item Type: Journal Article
Publication: Materials Letters
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Ceramics;Processing;Sintering;Microstructure;Dielectrics.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 02 Sep 2010 09:01
Last Modified: 19 Sep 2010 06:15
URI: http://eprints.iisc.ac.in/id/eprint/31923

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