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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Abstract

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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