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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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

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Title
Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3-Bi1/2K1/2TiO3 system
Author
Acosta, MatiasLiu, NaDeluca, MarcoHeidt, SabrinaRingl, InesDietz, ChristianStark, Robert W.Jo, Wook
Issue Date
2015-04
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.117, no.13, pp.1 - 8
Abstract
The morphotropic phase boundary composition Bi1/2Na1/2TiO3-20 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. ⓒ 2015 AIP Publishing LLC
URI
https://scholarworks.unist.ac.kr/handle/201301/11533
URL
http://scitation.aip.org/content/aip/journal/jap/117/13/10.1063/1.4916719
DOI
10.1063/1.4916719
ISSN
0021-8979
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