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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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Influence of electric fields on the depolarization temperature of Mn-doped (1-x)Bi1/2Na1/2TiO3-xBaTiO(3)

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Title
Influence of electric fields on the depolarization temperature of Mn-doped (1-x)Bi1/2Na1/2TiO3-xBaTiO(3)
Author
Sapper, EvaSchaab, SilkeJo, WookGranzow, TorstenRoedel, Juergen
Keywords
Depolarization temperature; Electric bias; External fields; Heating conditions; Higher temperatures; Lead-Free; Long range orders; Mn-doped; Piezo-ceramics; Poled sample; Poling directions; Temperature dependent; Thermally stimulated depolarization currents; TiO
Issue Date
2012-01
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.111, no.1, pp. -
Abstract
The transition between induced long-range order and relaxor-like behavior upon heating is investigated in lead-free (1-x)Bi1/2Na1/2(Ti0.995Mn0.005)O-3-xBa(Ti0.995Mn0.005)O-3 piezoceramics with x = 0.03, 0.06, and 0.09 (BNT-100xBT:Mn). Temperature-dependent permittivity epsilon'(T) and thermally stimulated depolarization currents (TSDC) of poled samples were measured under identical heating conditions to clarify the depolarization mechanism. In both methods, the influence of electric bias fields on the transition temperature was investigated. Fields applied in the poling direction shift the transition to higher temperatures, with corresponding results in epsilon'(T) and TSDC measurements. While the response of transition temperature to external fields displays a similar trend in all investigated compositions, the shape of TSDC is clearly connected with the composition and, hence, the crystal symmetry of the sample. Furthermore, the comparison of epsilon'(T) and TSDC data reveals a systematic shift between transition temperatures obtained with the two different methods.
URI
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DOI
10.1063/1.3674275
ISSN
0021-8979
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