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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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Ergodicity reflected in macroscopic and microscopic field-dependent behavior of BNT-based relaxors

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Title
Ergodicity reflected in macroscopic and microscopic field-dependent behavior of BNT-based relaxors
Author
Dittmer, RobertGobeljic, DankaJo, WookShvartsman, Vladimir V.Lupascu, Doru C.Jones, Jacob L.Roedel, Juergen
Keywords
LEAD-FREE PIEZOCERAMICS; FREE PIEZOELECTRIC CERAMICS; PHASE-TRANSITION; FERROELECTRICS; TEMPERATURE; PERSPECTIVE; STRAIN
Issue Date
2014-02
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.115, no.8, pp.1 - 10
Abstract
The effect of heterovalent B-site doping on ergodicity of relaxor ferroelectrics is studied using (1 - y)(0.81Bi(1/2)Na(1/2)TiO(3)-0.19Bi(1/2)K(1/2)TiO(3))-yBiZn(1/2)Ti(1/2)O(3) (BNT-BKT-BZT) with y - {0.02;0.03;0.04} as a model system. Both the large- and small-signal parameters are studied as a function of electric field. The crystal structure is assessed by means of neutron diffraction in the initial state and after exposure to a high electric field. In order to measure ferroelastic domain textures, diffraction patterns of the poled samples are collected as a function of sample rotation angle. Piezoresponse force microscopy (PFM) is employed to probe the microstructure for polar regions at a nanoscopic scale. For low electric fields E < 2 kV.mm(-1), large- and small-signal constitutive behavior do not change with composition. At high electric fields, however, drastic differences are observed due to a field-induced phase transition into a long-range ordered state. It is hypothesized that increasing BZT content decreases the degree of non-ergodicity; thus, the formation of long-range order is impeded. It is suggested that frozen and dynamic polar nano regions exist to a different degree, depending on the BZT content. This image is supported by PFM measurements. Moreover, PFM measurements suggest that the relaxation mechanism after removal of the bias field is influenced by surface charges
URI
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DOI
10.1063/1.4867157
ISSN
0021-8979
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MSE_Journal Papers
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