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Electrical investigations of holmium-doped BaTiO3 derived from sol-gel combustion

Published online by Cambridge University Press:  31 January 2011

Marin Cernea ,
Carmen Galassi ,
Bogdan S. Vasile ,
Paul Ganea ,
Roxana Radu  and
Georgiana Ghita
Marin Cernea*
Affiliation:
National Institute for Materials Physics, RO-77125, Magurele-Bucharest, Romania
Carmen Galassi
Affiliation:
CNR-ISTEC, Research Institute of Science and Technology for Ceramics, National Research Council, Faenza, Italy
Bogdan S. Vasile
Affiliation:
University Politehnica of Bucharest, RO-060042, Bucharest, Romania
Georgiana Ghita
Affiliation:
National Institute for Materials Physics, RO-77125, Magurele-Bucharest, Romania
*
a)Address all correspondence to this author. e-mail: mcernea@infim.ro
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Abstract

Holmium-doped BaTiO3 with composition Ba0.97Ho0.03TiO3 was prepared by sol-gel combustion method. A molar ratio of citrate/nitrate (CA/NO3− = 1.3) was used to prepare nanopowders of (Ba,Ho)TiO3. The structure and microstructure of (Ba,Ho)TiO3 powders and ceramics were investigated. The ceramics exhibit a dielectric constant of about 4400 and dielectric loss (tan δ = 0.267) at 10 Hz, and at the Curie temperature (Tc = 132 °C). The remanent polarization and the coercive field of Ba0.97Ho0.03TiO3 ceramics, at 1 kHz, were Pr = 6 μC/cm2 and EC = 0.75 kV/cm. The dielectric and ferroelectric behavior of the holmium-doped BaTiO3 is influenced by the amphoteric character of Ho3+ ions.

Keywords

Dielectric propertiesFerroelectricitySol-gel
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 6 , June 2010 , pp. 1057 - 1063
Copyright
Copyright © Materials Research Society 2010

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