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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Ordering effect on the electrical properties of stoichiometric Ba3CaNb2O9-based perovskite ceramics

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Rodrigues, J. E. ; Bezerra, D. M. ; Hernandes, A. C.
Total Authors: 3
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 43, n. 16, p. 14015-14022, NOV 2017.
Web of Science Citations: 4

Cation ordering is the most common phenomenon detected in A(3)B'B `' O-2(9)-based complex perovskites. Some important physical features of this system are due to the B-site ordering at long and short range. For microwave applications as filters and resonators, the 1:2 order is more appropriate. Otherwise, the oxygen vacancies and 1:1 order are considered the main factors behind the excellent performance of nonstoichiometric A(3)B'B1+x `' O-2-x(9-delta)-based ceramics as proton conductors. Until now, however, there are no available reports regarding the isolated effects of B-site ordering at long range on the electrical properties of stoichiometric systems. This work reports the preparation of 1:1 and 1:2 ordered Ba3CaNb2O9 ceramics. Here, we combine the Raman scattering and group-theory calculations to distinguish the fingerprints of the 1:1 and 1:2 orders. The electrical properties of the ordered Ba3CaNb2O9 are analyzed in terms of a phenomenological model based on the parallel combination of a resistor, constant phase element, and capacitor. In particular, the conductivity relaxation ascribed to the grains is due to the oxygen vacancies. Besides, we found that the 1:1 order increases the dc conductivity compared to the 1:2 order. (AU)

FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
Grantee:Elson Longo da Silva
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC