Effect of Nb-donor and Fe-acceptor dopants in (Bi1/2Na1/2)TiO3–BaTiO3–(K0.5Na0.5)NbO3 lead-free piezoceramics

Jo, Wook; Erdem, Emre; Eichel, Rüdiger‐A.; Glaum, Julia; Granzow, Torsten; Damjanović, Dragan; Rödel, Jürgen

doi:10.1063/1.3437645

Cited by 78 publications

(43 citation statements)

References 48 publications

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“…43 The presence of such defect dipoles can stabilize ferroelectric order in the material and therefore increase the T d . 44 The subsequent decrease in T d due to higher temperature. 46 The decrease in both the room temperature d 33 and the T d which is observed at higher levels of Fe substitution may be associated with limited substitution of Fe in this material.…”

Section: Discussionmentioning

confidence: 99%

Structure and properties of Fe-modified Na0.5Bi0.5TiO3at ambient

et al. 2012

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Sodium bismuth titanate (NBT) ceramics are among the most promising lead-free materials for piezoelectric applications. This work reports the crystal structure and phase evolution of NBT and Fe-modified NBT (from 0-2 at% Fe) using synchrotron X-ray diffraction and Raman spectroscopy, both at ambient and elevated temperatures. The crystallographic results are discussed with reference to permittivity and piezoelectric thermal depolarization measurements of the same compositions. Changes in the depolarization temperature due to Fe substitution were detected by Raman spectroscopy, and were found to correlate closely with depolarization temperatures obtained from converse piezoelectric coefficient and permittivity measured in situ. The depolarization temperatures obtained from direct piezoelectric coefficient measured ex situ as well as the phase transition temperatures obtained from synchrotron X-ray diffraction were found to be at higher temperatures. The mechanisms underlying the relationship between permittivity and piezoelectric depolarization to structural transitions observed in Raman spectroscopy and X-ray diffraction are discussed.

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Section: Discussionmentioning

confidence: 99%

Structure and properties of Fe-modified Na0.5Bi0.5TiO3at ambient

et al. 2012

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“…11,12 Here, we use the term, giant strains, to distinguish them from the conventional electric-field-induced strain in poled ferroelectric (FE) materials in that the onset of these strains requires a certain threshold electric field level (referred to as E pol hereafter), but this electric-field-induced poling state becomes unstable with little trace of perceivable piezoelectricity when the field is removed. 13,14 This phenomenological feature categorized the materials with such strain behavior as a new material class designated as incipient piezoceramics. 15 In spite of the exceptionally large strains available in the incipient piezoceramics, there are at least three challenges to be overcome for versatile applications.…”

Section: Introductionmentioning

confidence: 99%

Incipient piezoelectrics and electrostriction behavior in Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

Han¹,

Jo²,

Kang³

et al. 2013

Journal of Applied Physics

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Articles you may be interested inElectric-field-temperature phase diagram of the ferroelectric relaxor system (1−x)Bi1/2Na1/2TiO3−xBaTiO3 doped with manganese J. Appl. Phys. 115, 194104 (2014) Relaxorlike dielectric properties and history-dependent effects in the lead-free K 0.5 Na 0. Dielectric, ferroelectric, piezoelectric, and strain properties of lead-free Sn-doped Bi 1/2 (Na 0.82 K 0.18 ) 1/2 TiO 3 (BNKT) were investigated. A crossover from a nonergodic relaxor to an ergodic relaxor state at room temperature, accompanied by a giant electric-field-induced strain, was observed at 5 at. % Sn doping. Switching dynamics monitored during a bipolar poling cycle manifested that the observed giant strain originates from incipient piezoelectricity. When Sn doping level reached 8 at. %, BNKT exhibited an electrostrictive behavior with a highly temperature-insensitive electrostrictive coefficient of Q 11 ¼ 0.023 m 4 C À2 . V C 2013 AIP Publishing LLC [http://dx;

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“…30,31 Later, it was shown that this near non-polar P4bm phase is favored when Na þ ions are replaced by bigger isovalent ions such as K þ (Ref. 32) or when A-site vacancy is created, [33][34][35][36][37] while unfavored with acceptor dopants generating oxygen vacancies. 33,37 In the meantime, Ma et al 23 proposed another "relaxor antiferroelectric" model with the terminology being the same with the model of Dorcet et al 17 but with the underlying physics being completely different.…”

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On the phase identity and its thermal evolution of lead free (Bi1/2Na1/2)TiO3-6 mol% BaTiO3

Schaab

Sapper

et al. 2011

Journal of Applied Physics

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540

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Articles you may be interested inElectric-field-temperature phase diagram of the ferroelectric relaxor system (1−x)Bi1/2Na1/2TiO3−xBaTiO3 doped with manganese J. Appl. Phys. 115, 194104 (2014); 10.1063/1.4876746Long ranged structural modulation in the pre-morphotropic phase boundary cubic-like state of the lead-free piezoelectric Na1/2Bi1/2TiO3-BaTiO3 J. Appl. Phys. 114, 234102 (2013) On the phase identity and its thermal evolution of lead free (Bi 1/2 Na 1/2 )TiO 3 -6 mol% BaTiO 3 Temperature-dependent dielectric permittivity of 0.94(Bi 1/2 Na 1/2 )TiO 3 -0.06BaTiO 3 (BNT-6BT) lead-free piezoceramics was studied to disentangle the existing unclear issues over the crystallographic aspects and phase stability of the system. Application of existing phenomenological relaxor models enabled the relaxor contribution to the entire dielectric permittivity spectra to be deconvoluted. The deconvoluted data in comparison with the temperature-dependent dielectric permittivity of a classical perovskite relaxor, La-modified lead zirconate titanate, clearly suggest that BNT-6BT belongs to the same relaxor category, which was also confirmed by a comparative study on the temperature-dependent polarization hysteresis loops of both materials. Based on these results, we propose that the low-temperature dielectric anomaly does not involve any phase transition such as ferroelectric-toantiferroelectric. Supported by transmission electron microscopy and X-ray diffraction experiments at ambient temperature, we propose that the commonly observed two dielectric anomalies are attributed to thermal evolution of ferroelectric polar nanoregions of R3c and P4bm symmetry, which coexist nearly throughout the entire temperature range and reversibly transform into each other with temperature.

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Effect of Nb-donor and Fe-acceptor dopants in (Bi1/2Na1/2)TiO3–BaTiO3–(K0.5Na0.5)NbO3 lead-free piezoceramics

Cited by 78 publications

References 48 publications

Structure and properties of Fe-modified Na0.5Bi0.5TiO3at ambient

Structure and properties of Fe-modified Na0.5Bi0.5TiO3at ambient

Incipient piezoelectrics and electrostriction behavior in Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

On the phase identity and its thermal evolution of lead free (Bi1/2Na1/2)TiO3-6 mol% BaTiO3

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