Phase transitions and soft modes in sodium bismuth titanate

Vakhrushev, S. B.; Исупов, В. А.; Kvyatkovsky, B. E.; Okuneva, N. M.; Пронин, И. П.; Smolensky, G. A.; Сырников, П. П.

doi:10.1080/00150198508221396

Cited by 277 publications

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“…The presence of superlattice spots in perovskite oxides indicate a doubling of the unit cell and it has been attributed to either cation ordering or oxygen octahedra tilting. 26,27 Since cation ordering is not likely to occur in these ceramics, [28][29][30] the electron diffraction results indicate that BNT-FE is rhombohedrally distorted, most likely with the R3c space group, [28][29][30] and BNT-AFE displays a pseudocubic perovskite structure with, at the moment, unknown octrahedra tilting. A mixed tilting system, either a combination of in-phase and antiphase tilting or a two phase mixture of one antiphase and one in-phase tilting, is possible.…”

Section: Resultsmentioning

confidence: 99%

“…31 It should be pointed out that the complexity and confusion in BNT-AFE trace their origin back to the base compound ͑Bi 1/2 Na 1/2 ͒TiO 3 . Earlier x-ray 28 and neutron 29 structural studies indicate that there are no antiparallel cation displacements in ͑Bi 1/2 Na 1/2 ͒TiO 3 , and the term "diffused antiferroelectric" was used to describe the mixed relaxor and antiferroelectric behavior. 29 Later, contradictory observations were reported in a detailed neutron diffraction study where antiparallel cation displacements were found in the antiferroelectric tetragonal phase.…”

Section: Discussionmentioning

confidence: 99%

“…Earlier x-ray 28 and neutron 29 structural studies indicate that there are no antiparallel cation displacements in ͑Bi 1/2 Na 1/2 ͒TiO 3 , and the term "diffused antiferroelectric" was used to describe the mixed relaxor and antiferroelectric behavior. 29 Later, contradictory observations were reported in a detailed neutron diffraction study where antiparallel cation displacements were found in the antiferroelectric tetragonal phase. 30 In addition, the tetragonal phase was reported to coexist with the ferroelectric rhombohedral phase over a wide temperature range.…”

Section: Discussionmentioning

confidence: 99%

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Effect of uniaxial stress on ferroelectric behavior of (Bi1/2Na1/2)TiO3-based lead-free piezoelectric ceramics

Tan

Aulbach

et al. 2009

Journal of Applied Physics

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Prior studies have shown that a field-induced ferroelectricity in ceramics with general chemical formula (1−x−y)(Bi1/2Na1/2)TiO3-xBaTiO3-y(K0.5Na0.5)NbO3 and a very low remanent strain can produce very large piezoelectric strains. Here we show that both the longitudinal and transverse strains gradually change with applied electric fields even during the transition from the nonferroelectric to the ferroelectric state, in contrast to known Pb-containing antiferroelectrics. Hence, the volume change and, in turn, the phase transition can be affected using uniaxial compressive stresses, and the effect on ferroelectricity can thus be assessed. It is found that the 0.94(Bi1/2Na1/2)TiO3-0.05BaTiO3-0.01(K0.5Na0.5)NbO3ceramic (largely ferroelectric), with a rhombohedral R3c symmetry, displays large ferroelectric domains, significant ferroelastic deformation, and large remanent electrical polarizations even at a 250 MPa compressive stress. In comparison, the 0.91(Bi1/2Na1/2)TiO3-0.07BaTiO3-0.02(K0.5Na0.5)NbO3ceramic (largely nonferroelectric) possesses characteristics of a relaxor ferroelectricceramic, including a pseudocubic structure, limited ferroelastic deformation, and low remanent polarization. The results are discussed with respect of the proposed antiferroelectric nature of the nonferroelectric state. Prior studies have shown that a field-induced ferroelectricity in ceramics with general chemical formula ͑1−x − y͒͑Bi 1/2 Na 1/2 ͒TiO 3 -xBaTiO 3 -y͑K 0.5 Na 0.5 ͒NbO 3 and a very low remanent strain can produce very large piezoelectric strains. Here we show that both the longitudinal and transverse strains gradually change with applied electric fields even during the transition from the nonferroelectric to the ferroelectric state, in contrast to known Pb-containing antiferroelectrics. Hence, the volume change and, in turn, the phase transition can be affected using uniaxial compressive stresses, and the effect on ferroelectricity can thus be assessed. It is found that the 0.94͑Bi 1/2 Na 1/2 ͒TiO 3 -0.05BaTiO 3 -0.01͑K 0.5 Na 0.5 ͒NbO 3 ceramic ͑largely ferroelectric͒, with a rhombohedral R3c symmetry, displays large ferroelectric domains, significant ferroelastic deformation, and large remanent electrical polarizations even at a 250 MPa compressive stress. In comparison, the 0.91͑Bi 1/2 Na 1/2 ͒TiO 3 -0.07BaTiO 3 -0.02͑K 0.5 Na 0.5 ͒NbO 3 ceramic ͑largely nonferroelectric͒ possesses characteristics of a relaxor ferroelectric ceramic, including a pseudocubic structure, limited ferroelastic deformation, and low remanent polarization. The results are discussed with respect of the proposed antiferroelectric nature of the nonferroelectric state.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of uniaxial stress on ferroelectric behavior of (Bi1/2Na1/2)TiO3-based lead-free piezoelectric ceramics

Tan

Aulbach

et al. 2009

Journal of Applied Physics

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“…paraelectric tetragonal (T) ! ferroelectric rhombohedral (R) on cooling, [15][16][17][18][19][20][21][22] with transition temperatures of about 550 and 300 C, respectively. It has been proposed that NBT has an intermediate orthorhombic bridging phase between T and R ones.…”

mentioning

confidence: 99%

The influence of Mn substitution on the local structure of Na0.5Bi0.5TiO3 crystals: Increased ferroelectric ordering and coexisting octahedral tilts

Yao

et al. 2012

Journal of Applied Physics

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The ferroelectric domain structure of pure Na 1/2 Bi 1/2 TiO 3 (NBT) and 1 at.% Mn-doped NBT (Mn-NBT) crystals was investigated by piezoresponse force microscopy. The correlation length of the polar regions was found to increase upon Mn substitution. High resolution transmission electron microscopy revealed that the coherency of the lattice across the domain boundaries between polar regions was also enhanced. Selected area electron diffraction showed that Mn favored coexisting 1/2 (ooo) and 1/2 (ooe) oxygen octahedral tiltings, over only 1/2 (ooo) for pure NBT. V C 2012 American Institute of Physics. [http://dx

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“…2,4 In fact, longitudinal piezoelectric constants of d 33 Ϸ 500 pC/ N have been reported both under large amplitude drive in the -E response 2 and more recently under weak-field drive using a Berlincourttype meter. 4 The phase transformational sequence on cooling for NBT has been reported to be cubic͑C͒ → tetragonal͑T͒ → rhombohedral͑R͒: [5][6][7][8][9] with phase transition temperatures of about 520°C and 260°C, respectively. Interestingly, no distinct structural changes associated with the ferroelectric transformation have been reported at the maximum in the dielectric constant T max = 330°C.…”

mentioning

confidence: 99%

Hierarchical domains in Na1/2Bi1/2TiO3 single crystals: Ferroelectric phase transformations within the geometrical restrictions of a ferroelastic inheritance

Yao

Luo

et al. 2010

Applied Physics Letters

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Phase transitions and soft modes in sodium bismuth titanate

Cited by 277 publications

References 4 publications

Effect of uniaxial stress on ferroelectric behavior of (Bi1/2Na1/2)TiO3-based lead-free piezoelectric ceramics

Effect of uniaxial stress on ferroelectric behavior of (Bi1/2Na1/2)TiO3-based lead-free piezoelectric ceramics

The influence of Mn substitution on the local structure of Na0.5Bi0.5TiO3 crystals: Increased ferroelectric ordering and coexisting octahedral tilts

Hierarchical domains in Na1/2Bi1/2TiO3 single crystals: Ferroelectric phase transformations within the geometrical restrictions of a ferroelastic inheritance

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