High-field electromechanical response of Bi0.5Na0.5TiO3–Bi0.5K0.5TiO3across its morphotropic phase boundary

Azam, Mohd Asyadi; Bahrevar, M.A.; Aghaei, Alireza; Ramos, P.; Algueró, Miguel; Amorín, Harvey

doi:10.1088/0022-3727/47/5/055304

Cited by 60 publications

(32 citation statements)

References 45 publications

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“…Though this effect might play a role, it should be noted that BNKT already shows a tendency to pinched loops. Indeed, in this system the evolution from conventional to pinched loops was correlated to the decrease in T d [14], just like taking place in the ternary system with the addition of BiFeO 3 . Similar loops have also been reported in relaxor systems, such as 0.9Pb(Mg 1/3 Nb 2/3 )O 3 -0.1PbTiO 3 , at the onset of the ferroelectric long-range order [36].…”

Section: Resultssupporting

confidence: 53%

“…The giant strain is thought to be associated with an electric field-induced phase change between a short-range intermediate polar state and long-range ferroelectric order [14,37]. This is a different mechanism to ferroelectric/ferroelastic domain wall movements, generally operative in piezoceramics, that constitute the basic contribution to piezoelectricity [38].…”

Section: Resultsmentioning

confidence: 99%

“…BKT is a relaxor ferroelectric material with tetragonal perovskite structure (P4 mm), which forms a morphotropic phase boundary (MPB) in solid solution with BNT, (1 -x)BNT-xBKT (BNKTx) for x values in the 0.16-0.20 range [12,13]. We have recently shown that BNKT0.20 exhibits giant field-induced strain of 0.13 % under an electric field of 1 kV mm -1 , with clear advantages for actuation [14]. Further enhancement of the response might be obtained by ceramic texturing [15,16], an effect that has been demonstrated for a range of perovskite MPB materials, also lead-free like (K,Na)NbO 3 -based compositions [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Effects of nano-sized BiFeO3 addition on the properties of high piezoelectric response (1 − x)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3 ceramics

et al. 2014

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The role of BiFeO 3 addition on the crystal structure, microstructure, and the electrical and electromechanical properties of high-sensitivity Bi 0.5 Na 0.5 TiO 3 -Bi 0.5 K 0.5 TiO 3 ferroelectric ceramics for compositions at the morphotropic phase boundary (MPB) is investigated. A perovskite solid solution from nano-sized BiFeO 3 and Bi 0.5 Na 0.5 TiO 3 -Bi 0.5 K 0.5 TiO 3 powders is obtained, in which the persistence of a MPB in the ternary system is demonstrated. The structural characterization, along with the electrical properties, indicates the stabilization of intermediate domain configurations, associated with a decrease of the temperature for the development of the ferroelectric long-range order. As a consequence, high phase-change electromechanical response is found for certain small BiFeO 3 additions. This result is very promising for the processing of textured ceramics taking advantage of the decomposition behaviour of BiFeO 3 . Ceramic texturing is demonstrated, a key technology for developing lead-free piezoelectrics that can replace Pb(Zr,Ti)O 3 .

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of nano-sized BiFeO3 addition on the properties of high piezoelectric response (1 − x)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3 ceramics

et al. 2014

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“…However, the lead content in PZT materials has raised environmental concerns, and recent governmental regulations require their replacement by environmentally friendly alternatives [3]. Consequently, research is intensive in the search for alternative lead-free materials with comparable performance, among which BaTiO 3 (BT), Bi 0.5 Na 0.5 TiO 3 (BNT), and (K,Na)NbO 3 (KNN) based compositions stand out [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Origin of discrepancy between electrical and mechanical anomalies in lead-free (K,Na)NbO3 -based ceramics

et al. 2016

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Ferroelectric polymorphic phase coexistence, associated with either the presence of a morphotropic phase boundary or a temperature-driven polymorphic phase transition, is currently acknowledged as the key to high piezoelectric activity and is searched when new perovskite materials are developed, like lead-free alternatives to state-of-the-art Pb(Zr,Ti)O 3 . This requires characterization tools that allow phase coexistence and transitions to be readily identified, among which measurements of the temperature dependences of Young's modulus and mechanical losses by dynamical mechanical analysis stand out as a powerful technique to complement standard electrical characterizations. We report here the application of this technique to (K 1−x Na x )NbO 3 -based materials, which are under extensive investigation as environmentally friendly high sensitivity piezoelectrics. The elastic anomalies associated with the different phase transitions are identified and are shown to be distinctively shifted in relation to the dielectric ones. The origin of this discrepancy is discussed with the help of temperature-dependent Raman spectroscopy and is proposed to be a characteristic of diffuse phase transitions.

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“…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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High-field electromechanical response of Bi_0.5Na_0.5TiO₃–Bi_0.5K_0.5TiO₃across its morphotropic phase boundary

Cited by 60 publications

References 45 publications

Effects of nano-sized BiFeO3 addition on the properties of high piezoelectric response (1 − x)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3 ceramics

Effects of nano-sized BiFeO3 addition on the properties of high piezoelectric response (1 − x)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3 ceramics

Origin of discrepancy between electrical and mechanical anomalies in lead-free (K,Na)NbO3 -based ceramics

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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High-field electromechanical response of Bi0.5Na0.5TiO3–Bi0.5K0.5TiO3across its morphotropic phase boundary

Cited by 60 publications

References 45 publications

Effects of nano-sized BiFeO3 addition on the properties of high piezoelectric response (1 − x)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3 ceramics

Effects of nano-sized BiFeO3 addition on the properties of high piezoelectric response (1 − x)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3 ceramics

Origin of discrepancy between electrical and mechanical anomalies in lead-free (K,Na)NbO3 -based ceramics

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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High-field electromechanical response of Bi_0.5Na_0.5TiO₃–Bi_0.5K_0.5TiO₃across its morphotropic phase boundary

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