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Dielectric properties of barium magnesiotitanate ceramics, $BaMg_6Ti_6O_1_9$

Jayanthi, S and Kutty, TRN (2006) Dielectric properties of barium magnesiotitanate ceramics, $BaMg_6Ti_6O_1_9$. In: Materials Letters, 60 (6). pp. 796-800.

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Phase-pure samples of barium magnesiotitanate, $BaMg_6Ti_6O_1_9$ (BMT) are prepared by the wet chemical 'gel-carbonate' method wherein the formation of BMT is complete below $950 ^oC$ as a result of the reaction between nanoparticles of $BaCO_3, MgO and TiO_2$. BMT powders are sintered at $1350-1450 ^oC$ 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 $MgTiO_3-BaTiO_3$ tie-line in $BaO-MgO-TiO_2$ phase diagram. Dielectric properties of sintered (BMT) ceramics have been investigated which showed \varepsilon \simeq 39 at 2 GHz, quality factor Q \geq10,000 and positive temperature coefficient of dielectric constant around 370 ppm $^oC^-^1$.

Item Type: Journal Article
Publication: Materials Letters
Publisher: Elsevier BV
Additional Information: The Copyright belongs to Elsevier BV.
Keywords: Ceramics;Processing;Sintering;Microstructure;Dielectrics
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 01 Feb 2006
Last Modified: 19 Sep 2010 04:22
URI: http://eprints.iisc.ac.in/id/eprint/5100

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