Nd2Ba2CaZn2Ti3O14.4: a new high dielectric constant oxide having a disordered (cubic) perovskite structure

Jha, Pika ; Bobev, Svilen ; Subbanna, Gonur N. ; Ganguli, Ashok K. (2003) Nd2Ba2CaZn2Ti3O14.4: a new high dielectric constant oxide having a disordered (cubic) perovskite structure Chemistry of Materials, 15 (11). pp. 2229-2233. ISSN 0897-4756

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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm030043p

Related URL: http://dx.doi.org/10.1021/cm030043p

Abstract

A new oxide of the formula Nd2Ba2CaZn2Ti3O14.4 has been successfully prepared by a high-temperature ceramic route at 1200 °C. The title compound crystallizes in a cubic structure with a = 3.94263(7) Å (space group = Pm3m, 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 title compound has a high dielectric constant of 59 at 100 kHz and a very small frequency coefficient of the dielectric constant (dε/dF = 1.26 × 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 °C.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:62014
Deposited On:16 Sep 2011 03:49
Last Modified:16 Sep 2011 03:49

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