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Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system

Acosta, Matias and Liu, Na and Deluca, Marco and Heidt, Sabrina and Ringl, Ines and Dietz, Christian and Stark, Robert W. and Jo, Wook (2015):
Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system.
In: Journal of Applied Physics, AIP Publishing, pp. 134106(1-8), 117, (13), ISSN 0021-8979,
[Online-Edition: http://dx.doi.org/10.1063/1.4916719],
[Article]

Abstract

The morphotropic phase boundary composition Bi1/2 Na 1/2TiO3-20 mol. % Bi1/2K1/2TiO3 was chosen as initial material to do selective A-site aliovalent doping replacing Na and K by 1 at. % La, respectively. The materials were studied macroscopically by measuring dielectric and electromechanical properties. The Na-replaced material has a lower freezing temperature Tfr, lower remanent polarization and remanent strain, and thus a higher degree of ergodicity than the K-replaced material. These results are contrasted with local poling experiments and hysteresis loops obtained from piezoresponse force microscopy. The faster relaxation of the tip-induced local polarization and the lower remanent state in bias-on and -off loops confirm the higher degree of ergodicity of the Na-replaced material. The difference in functional properties is attributed to small variations in chemical pressure achieved through selective doping. Raman results support this working hypothesis.

Item Type: Article
Erschienen: 2015
Creators: Acosta, Matias and Liu, Na and Deluca, Marco and Heidt, Sabrina and Ringl, Ines and Dietz, Christian and Stark, Robert W. and Jo, Wook
Title: Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system
Language: English
Abstract:

The morphotropic phase boundary composition Bi1/2 Na 1/2TiO3-20 mol. % Bi1/2K1/2TiO3 was chosen as initial material to do selective A-site aliovalent doping replacing Na and K by 1 at. % La, respectively. The materials were studied macroscopically by measuring dielectric and electromechanical properties. The Na-replaced material has a lower freezing temperature Tfr, lower remanent polarization and remanent strain, and thus a higher degree of ergodicity than the K-replaced material. These results are contrasted with local poling experiments and hysteresis loops obtained from piezoresponse force microscopy. The faster relaxation of the tip-induced local polarization and the lower remanent state in bias-on and -off loops confirm the higher degree of ergodicity of the Na-replaced material. The difference in functional properties is attributed to small variations in chemical pressure achieved through selective doping. Raman results support this working hypothesis.

Journal or Publication Title: Journal of Applied Physics
Volume: 117
Number: 13
Publisher: AIP Publishing
Uncontrolled Keywords: Doping; Materials properties; Relaxor ferroelectrics; Polarization; Sodium
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science > Physics of Surfaces
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A1: Manufacturing of ceramic, textured actuators with high strain
Profile Areas > Thermo-Fluids & Interfaces
Profile Areas
Date Deposited: 07 Apr 2015 08:36
Official URL: http://dx.doi.org/10.1063/1.4916719
Additional Information:

SFB 595 A1

Identification Number: doi:10.1063/1.4916719
Funders: This work was supported by the Deutsche Forschungsgemeinschaft through the Sonderforschungsbereich 595/D6 “Electrical Fatigue in Functional Materials” and the AdRIA Hesse state center for Adaptronics.
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