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$Nd_{2}Ba_{2}CaZn_{2}Ti_{3}O_{14.4}$: A new high dielectric constant oxide having a disordered (cubic) perovskite structure

Jha, Pika and Bobev, Svilen and Subbanna, Gonur N and Ganguli, Ashok K (2003) $Nd_{2}Ba_{2}CaZn_{2}Ti_{3}O_{14.4}$: A new high dielectric constant oxide having a disordered (cubic) perovskite structure. In: Chemistry of Matirials, 15 (11). pp. 2229-2233.

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A new oxide of the formula Nd2Ba2CaZn2Ti3O14.4 has been successfully prepared by a high-temperature ceramic route at 1200 degreesC. The title compound crystallizes in a cubic structure with a = 3.94263(7) Angstrom (space group = Pm (3) over barm, wRp = 0.0305, Rp, = 0.0192) as obtained from Rietveld refinement of powder neutron diffraction data. X-ray and electron diffraction studies also confirm the absence of any ordering of the cations. The titlen compound has a high dielectric constant of 59 at 100 kHz and a very small frequency coefficient of the dielectric constant (depsilon/dF = 1.26 x 10(-6) Hz(-1)). The dielectric loss is 0.0047 at 100 kHz, which also shows very minor variation with frequency. The temperature-dependence studies show an increase in dielectric constant and dielectric loss over the temperature range 35-300 degreesC.

Item Type: Journal Article
Publication: Chemistry of Matirials
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 04 Nov 2009 09:05
Last Modified: 19 Sep 2010 04:55
URI: http://eprints.iisc.ac.in/id/eprint/17163

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