Electric properties of Fe-doped Na0.5Bi0.5TiO3 ceramics in unpoled and poled state

Suchanicz, J.; Wąs, M.; Nowakowska-Malczyk, M.; Jeleń, Piotr; Konieczny, K.; Czaja, P.; Kluczewska-Chmielarz, K.; Sitko, D.; Kruzina, T. V.; Sokołowski, M.

doi:10.1080/01411594.2020.1804902

Cited by 3 publications

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“…A few papers have reported the properties of Fe/Mn-doped NBT [19,[19][20][21][22][23][24][25][26][27][28][29], however, most of them are limited to room temperature. There are no studies on the properties of these materials in a poled state.…”

Section: Introductionmentioning

confidence: 99%

Properties of Na0.5Bi0.5TiO3 Ceramics Modified with Fe and Mn

et al. 2022

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Na0.5Bi0.5TiO3 (NBT) and Fe- and Mn-modified NBT (0.5 and 1 mol%) ceramics were synthesized by the solid-state reaction method. The crystal structure, dielectric and thermal properties of these ceramics were measured in both unpoled and poled states. Neither the addition of iron/manganese to NBT nor poling changed the average crystal structure of the material; however, changes were observed in the short-range scale. The changes in shapes of the Bragg peaks and in their 2Θ-position and changes in the Raman spectra indicated a temperature-driven structural evolution similar to that in pure NBT. It was found that both substitutions led to a decrease in the depolarization temperature Td and an increase in the piezoelectric coefficient d33. In addition, applying an electric field reactivated and extended the ferroelectric state to higher temperatures (Td increased). These effects could be the result of: crystal structure disturbance; changes in the density of defects; the appearance of (FeTiˈ-), (Mn′Ti-V••O) and (Mn″Tii-V••O )—microdipoles; improved domain reorientation conditions and instability of the local polarization state due to the introduction of Fe and Mn into the NBT; reinforced polarization/domain ordering; and partial transformation of the rhombohedral regions into tetragonal ones by the electric field, which supports a long-range ferroelectric state. The possible occupancy of A- and/or B-sites by Fe and Mn ions is discussed based on ionic radius/valence/electronegativity principles. The doping of Fe/Mn and E-poling offers an effective way to modify the properties of NBT.

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Section: Introductionmentioning

confidence: 99%

Properties of Na0.5Bi0.5TiO3 Ceramics Modified with Fe and Mn

et al. 2022

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“…The mobile ionic defect present in NBT system (i.e., oxygen vacancies), can be either enhanced or decreased using specific doping elements. For instance, if acceptor doping is used, the ionic conductivity of NBT can be significantly enhanced making it an excellent oxide-ion conductor [6][7][8][9][10] . On the other hand, Yang et al demonstrated that isovalent doping (such as RE 3+ to replace Bi 3+ ) resulted in an important decrease of the conductivity within NBT system which was related to the lower polarizability of the rare-earth elements 6 .…”

Section: Introductionmentioning

confidence: 99%