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Tailoring Strain Properties of (0.94−x)Bi1/2Na1/2TiO3-0.06BaTiO3-xK0.5Na0.5NbO3Ferroelectric/Relaxor Composites

Groh, Claudia and Jo, Wook and Rödel, Jürgen (2014):
Tailoring Strain Properties of (0.94−x)Bi1/2Na1/2TiO3-0.06BaTiO3-xK0.5Na0.5NbO3Ferroelectric/Relaxor Composites.
97, In: Journal of the American Ceramic Society, (5), pp. 1465-1470, ISSN 00027820, [Online-Edition: http://dx.doi.org/10.1111/jace.12783],
[Article]

Abstract

A remarkable progress in the quest of lead-free piezoceramics for actuator applications has been made with the development of incipient piezoceramics featured by giant strains. A drawback, however, is the high electric field required to generate this giant strain. A powerful approach to overcoming this drawback lies in relaxor/ferroelectric (FE) composites comprised such giant strain materials (matrix) and a FE or nonergodic relaxor (seed). In this study, we investigate the effect of K0.5Na0.5NbO3 content in the matrix and the volume ratio of seed to matrix using composites of 0.93Bi1/2Na1/2TiO3–0.07BaTiO3 as a seed and (0.94 − x)Bi1/2Na1/2TiO3–0.06BaTiO3–xK0.5Na0.5NbO3 as a matrix. The strain of all matrices, independent of their K0.5Na0.5NbO3 content, was found to be enhanced by adding a certain amount of seed. An optimum strain is achieved for the composite comprised of a matrix with x = 0.02 K0.5Na0.5NbO3 and 10% seed. By means of a differential analysis on the temperature-dependent dielectric permittivity, it was shown that the seed phase is still present in the composites despite the naturally expected diffusion process during sintering.

Item Type: Article
Erschienen: 2014
Creators: Groh, Claudia and Jo, Wook and Rödel, Jürgen
Title: Tailoring Strain Properties of (0.94−x)Bi1/2Na1/2TiO3-0.06BaTiO3-xK0.5Na0.5NbO3Ferroelectric/Relaxor Composites
Language: English
Abstract:

A remarkable progress in the quest of lead-free piezoceramics for actuator applications has been made with the development of incipient piezoceramics featured by giant strains. A drawback, however, is the high electric field required to generate this giant strain. A powerful approach to overcoming this drawback lies in relaxor/ferroelectric (FE) composites comprised such giant strain materials (matrix) and a FE or nonergodic relaxor (seed). In this study, we investigate the effect of K0.5Na0.5NbO3 content in the matrix and the volume ratio of seed to matrix using composites of 0.93Bi1/2Na1/2TiO3–0.07BaTiO3 as a seed and (0.94 − x)Bi1/2Na1/2TiO3–0.06BaTiO3–xK0.5Na0.5NbO3 as a matrix. The strain of all matrices, independent of their K0.5Na0.5NbO3 content, was found to be enhanced by adding a certain amount of seed. An optimum strain is achieved for the composite comprised of a matrix with x = 0.02 K0.5Na0.5NbO3 and 10% seed. By means of a differential analysis on the temperature-dependent dielectric permittivity, it was shown that the seed phase is still present in the composites despite the naturally expected diffusion process during sintering.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 97
Number: 5
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 May 2014 09:37
Official URL: http://dx.doi.org/10.1111/jace.12783
Identification Number: doi:10.1111/jace.12783
Funders: Adria
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