Compositional range and electrical properties of the morphotropic phase boundary in the Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3 system

Otoničar, Mojca; Škapin, Srečo D.; Spreitzer, Matjaž; Suvorov, Danilo

doi:10.1016/j.jeurceramsoc.2009.10.006

Cited by 165 publications

(77 citation statements)

References 44 publications

(45 reference statements)

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“…Detailed structural characterization of this complex region will be the subject of future study and is expected to be challenging: e.g., the structure of PZT at and near the MPB remains the subject of controversy after many years of detailed study where both multiple and single phase models have been proposed. [12][13][14][15] The reduced lattice parameters ( ( /2) [ 16,17 ] and other Pbfree MPB systems (0.08 for NBT-KBT, [ 18 ] 0.01 for NBT-BTO [ 19 ] ). To examine the piezoelectric behavior, discs were poled and longitudinal piezoelectric coeffi cients ( .…”

Section: Doi: 101002/adma201405452mentioning

confidence: 99%

Morphotropic Phase Boundary in the Pb‐Free (1 − x)BiTi_3/8Fe_2/8Mg_3/8O₃–xCaTiO₃ System: Tetragonal Polarization and Enhanced Electromechanical Properties

et al. 2015

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(NBT), BaTiO 3 (BTO), and K 0.5 Bi 0.5 TiO 3 (KBT) are known but all have inferior properties to PZT. [ 2,3,5 ] Bi 3+ has a 6s 2 confi guration with crystal chemistry similar to that of Pb 2+ , and bismuthbased perovskites are attractive as they can offer high Curie and depolarization temperatures required for demanding application environments. [ 5,6 ] [ 9 ] which can be converted into a long-range polarization along this direction by the introduction of LaFeO 3 (LFO) which itself has antiferrodistortive [110] p displacements, although this orthorhombic O [110] The perovskite oxide lead zirconate titanate (PbZr 1− x Ti x O 3 ) (PZT) has extraordinary electromechanical properties at the morphotropic phase boundary (MPB), [ 1 ] making modifi ed PZT ceramics the basis for almost all actuators, sensors and related applications in use today. The MPB in the PZT solid solution occurs near x ≈ 0.48 [ 1 ] between the ferroelectric rhombohedral ( R 3 m , denoted as R [111] ) and tetragonal ( P 4 mm , denoted as T [001] ) phases, with polarizations lying along the [111] p body diagonal and [001] p edge of the primitive ≈ 4 Å ABO 3 perovskite unit cell, respectively. [1][2][3] The PZT phases are untilted and the R [111] and T [001] structures are described crystallographically, using a modifi ed Glazer notation, as a a a + , respectively, where the subscript indicates ferroelectric displacement and the superscript the nature of the octahedral tilting with respect to the primitive unit cell axes. [ 4 ] It is challenging to create an MPB in a bismuth-based lead-free system as it has proved diffi cult to prepare phases with polarization directed along the [001] p primitive cell edge in such materials. Several Pb-free MPB systems based on K 0.5 Na 0.5 NbO 3 , Na 0.5 Bi 0.5 TiO 3

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Section: Doi: 101002/adma201405452mentioning

confidence: 99%

Morphotropic Phase Boundary in the Pb‐Free (1 − x)BiTi_3/8Fe_2/8Mg_3/8O₃–xCaTiO₃ System: Tetragonal Polarization and Enhanced Electromechanical Properties

et al. 2015

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“…The replacement of Na þ in NBT with K þ leads to an increase in the piezoelectric response of the material 21,22 and a decrease in T d from $170 C to $100 C. 10,23,24 The composition and temperature-based structural changes are not well known because of the small distortions involved and reports of a wide two-phase region as a function of composition. 25 However, various electrical properties, including the piezoelectric coefficient d 33 , were found to be maximised at the composition (Na 0.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the depolarisation transition in Bi-based relaxor ferroelectrics

Woodward

Dittmer

et al. 2014

Journal of Applied Physics

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The loss of macroscopic polarisation in relaxor ferroelectric (Na0.8K0.2)½Bi½TiO3 ceramics doped with BiZn½Ti½O3 has been studied by electrical and structural methods. These indicate that the phenomena that are coupled in a displacive phase transition are not necessarily coupled in the depolarisation of Na½Bi½TiO3-based relaxors and a concept of correlated and uncorrelated switching of dipoles within adjacent unit cells is used to explain this. Second harmonic generation performed on poled ceramics during heating yields values of the freezing temperature and shows a broad temperature range of ∼100 °C across which the structure changes from field-induced ferroelectric to an equilibrium-state ergodic relaxor. Electrical poling at room temperature causes poled regions to increase in size by ∼2 orders of magnitude. A model illustrating the main steps in thermal depolarisation is described that does not require a phase transition to take place on a unit cell level.

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“…At the MPB both rhombohedral and tetragonal pseudosymmetries persist, also observed via X-ray diffraction [19]. Previous electric-field dependent X-ray diffraction measurements have identified significant electricfield-dependent structural transition from pseudo-to more definite tetragonal and rhombohedral symmetries [17,20].…”

Section: Introductionmentioning

confidence: 86%

“…It has attracted interest because of the MPB between rhombohedral and tetragonal phases around x = 0.20 [4][5][6]. Here a significant enhancement in piezoelectric properties is observed over pure NBT, increasing the d 33 from ~65 to ~190 pC/N [16][17][18]. A TEM study has shown a transition across the MPB from a rhombohedral/monoclinic anti-phase tilt to short range in-phase tilts in a tetragonal phase.…”

Section: Introductionmentioning

confidence: 99%

Electric field dependent local structure of (KxNa1−x)0.5
Goetzee-Barral
¹
,
Usher
²
,
Stevenson
³

et al. 2017
Phys. Rev. B
18
0
4
0
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The in situ X-ray Pair Distribution Function (PDF) characterisation technique has been used to study the behaviour of (K x Na 1-x ) 0.5 Bi 0.5 TiO 3 , as a function of electric field. As opposed to conventional X-ray Bragg diffraction techniques, PDF is sensitive to local atomic displacements, detecting local structural changes at the Ångstrom to nanometre scale. Several field-dependent ordering mechanisms can be observed in x = 0.15, 0.18 and at the morphotropic phase boundary (MPB) composition x = 0.20. X-ray total scattering shows suppression of diffuse scattering with increasing electric field amplitude, indicative of an increase in structural ordering. Analysis of PDF peaks in the 3-4 Å range shows ordering of Bi-Ti distances parallel to the applied electric field, illustrated by peak amplitude redistribution parallel and perpendicular to the electric field vector. A transition from ‹110› to ‹112› type off-centre displacements of Bi relative to the neighbouring Ti atoms are observable with increasing x. Analysis of PDF peak shift with electric field show the effects of Bi-Ti 2 redistribution and onset of piezoelectric lattice strain. The combination of these field-induced ordering mechanisms is consistent with local redistribution of Bi-Ti distances associated with domain reorientation and an overall increase in order of atomic displacements.

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Compositional range and electrical properties of the morphotropic phase boundary in the Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3 system

Cited by 165 publications

References 44 publications

Morphotropic Phase Boundary in the Pb‐Free (1 − x)BiTi_3/8Fe_2/8Mg_3/8O₃–xCaTiO₃ System: Tetragonal Polarization and Enhanced Electromechanical Properties

Morphotropic Phase Boundary in the Pb‐Free (1 − x)BiTi_3/8Fe_2/8Mg_3/8O₃–xCaTiO₃ System: Tetragonal Polarization and Enhanced Electromechanical Properties

Investigation of the depolarisation transition in Bi-based relaxor ferroelectrics

Electric field dependent local structure of (KxNa1−x)0.5
Goetzee-Barral
¹
,
Usher
²
,
Stevenson
³

et al. 2017
Phys. Rev. B
18
0
4
0
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Compositional range and electrical properties of the morphotropic phase boundary in the Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3 system

Cited by 165 publications

References 44 publications

Morphotropic Phase Boundary in the Pb‐Free (1 − x)BiTi3/8Fe2/8Mg3/8O3–xCaTiO3 System: Tetragonal Polarization and Enhanced Electromechanical Properties

Morphotropic Phase Boundary in the Pb‐Free (1 − x)BiTi3/8Fe2/8Mg3/8O3–xCaTiO3 System: Tetragonal Polarization and Enhanced Electromechanical Properties

Investigation of the depolarisation transition in Bi-based relaxor ferroelectrics

Electric field dependent local structure of (KxNa1−x)0.5Goetzee-Barral1, Usher2, Stevenson3 et al. 2017Phys. Rev. B18040View full textAdd to dashboardCite

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Morphotropic Phase Boundary in the Pb‐Free (1 − x)BiTi_3/8Fe_2/8Mg_3/8O₃–xCaTiO₃ System: Tetragonal Polarization and Enhanced Electromechanical Properties

Morphotropic Phase Boundary in the Pb‐Free (1 − x)BiTi_3/8Fe_2/8Mg_3/8O₃–xCaTiO₃ System: Tetragonal Polarization and Enhanced Electromechanical Properties

Electric field dependent local structure of (KxNa1−x)0.5
Goetzee-Barral
¹
,
Usher
²
,
Stevenson
³

et al. 2017
Phys. Rev. B
18
0
4
0
View full text Add to dashboard Cite