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

被引:6
作者
Suchanicz, Jan [1 ]
Was, Marcin [2 ]
Nowakowska-Malczyk, Michalina [3 ]
Sitko, Dorota [3 ]
Kluczewska-Chmielarz, Kamila [4 ]
Konieczny, Krzysztof [4 ]
Jaglo, Grzegorz [4 ]
Czaja, Piotr [4 ]
Handke, Bartosz [5 ]
Kucia, Zofia [5 ]
Zajac, Patryk [5 ]
Lyszczarz, Klaudia [5 ]
机构
[1] Agr Univ Krakow, Dept Mech Engn & Agrophys, Balicka 120, PL-31120 Krakow, Poland
[2] Agr Univ Krakow, Dept Bioproc Engn Power Engn & Automat, Balicka 120, PL-31120 Krakow, Poland
[3] Pedag Univ, Inst Phys, Podchorazych 2, PL-30084 Krakow, Poland
[4] Pedag Univ, Inst Technol, Podchorazych 2, PL-30084 Krakow, Poland
[5] AGH Univ Sci & Technol, Fac Mat Sci & Ceram, Al Mickiewicza 30, PL-30059 Krakow, Poland
关键词
Fe- and Mn-doped NBT; structural properties; dielectric properties; thermal properties; unpoled and poled states; ROOM-TEMPERATURE FERROMAGNETISM; FERROELECTRIC PROPERTIES; PHASE-TRANSITIONS; ELECTRICAL-PROPERTIES; STRAIN; NA1/2BI1/2TIO3; COEXISTENCE; RESONANCE; RAMAN; SITE;
D O I
10.3390/ma15186204
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 2 Theta-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 T-d and an increase in the piezoelectric coefficient d(33). In addition, applying an electric field reactivated and extended the ferroelectric state to higher temperatures (T-d increased). These effects could be the result of: crystal structure disturbance; changes in the density of defects; the appearance of (Fe-Ti|-), (Mn '(Ti)-V-O(center dot center dot)) and (Mn ''(Tii)-V-O(center dot center dot) )-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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页数:23
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