Journal
JOURNAL OF APPLIED PHYSICS
Volume 117, Issue 13, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4916719
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Funding
- Deutsche Forschungsgemeinschaft [Sonderforschungsbereich 595/D6]
- AdRIA Hesse state center for Adaptronics
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The morphotropic phase boundary composition Bi-1/2 Na(1/2)TiO(3-20)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. (C) 2015 AIP Publishing LLC.
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