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Title: Ferroelectricity in Bi26-xMxO40-δ (M = Al and Ga) with the γ-Bi2O3 structure
Authors: Mangalam, R V K
Ranjith, R
Iyo, A
Sundaresan, A
Krupanidhi, S B
Rao, C N R
Keywords: Ferroelectrics
X-ray scattering
Dielectric response
Issue Date: Oct-2006
Publisher: Elsevier Ltd
Citation: Solid State Communications 140(1), 42-44 (2006)
Abstract: We report on the dielectric properties of bismuth aluminate and gallate with Bi:Al(Ga) ratio of 1:1 and 12:1 prepared at high temperature and ambient pressure. These compounds crystallize in a noncentrosymmetric body-centered cubic structure (space group I23) with a ∼10.18 Å rather than in the perovskite structure. This cubic phase is related to the γ -Bi2O3 structure which has the actual chemical formula Bi3+24 (Bi3+ Bi5+)O40− δ. In the aluminates and gallates studied by us, the Al and Ga ions are distributed over the 24 f and 2a sites. These compounds exhibit ferroelectric hysteresis at room temperature with a weak polarization. c 2006 Elsevier Ltd. All rights reserved.
Description: Restricted Access
Other Identifiers: 0038-1098
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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