A transmission electron microscopy study of the A-site disordered perovskite Na0.5Bi0.5TiO3

Dorcet, Vincent; Trolliard, Gilles

doi:10.1016/j.actamat.2007.12.027

Cited by 217 publications

(162 citation statements)

References 24 publications

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“…11 It may represent the previously reported nano-scale platelets of space group P4bm within the room temperature structure. 8,9 When measured using longer-range probes such as X-ray diffraction, these fractions of the material may result in broadening of the diffraction peaks, as observed in the present work (cf. Fig.…”

Section: Discussionsupporting

confidence: 58%

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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: Discussionsupporting

confidence: 58%

“…Refinement of the diffraction patterns through the Rietveld method in both cases has indicated a room temperature average structure in the Cc space group rather than R3c. 6,7 In addition, Dorcet et al 8 …”

Section: Introductionmentioning

confidence: 99%

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

et al. 2012

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“…It has been noted that these superlattice reflections originate from slight deviations from the ideal perovskite structure, which could have intensity contributions from: (i) oxygen octahedral tilts; (ii) chemical ordering of the A-site cations; and/or (iii) antiparallel displacements of cations. 21,[64][65][66][67][68][69] In NBT, following theoretical 21 and experimental studies, 68,69 it is believed that oxygen octahedral tilting is the dominate source of the intensity. 32,70 Evidence of in-phase octahedral tilting in Mn-NBT at room temperature was apparent in (001) SAED patterns by weak 1/2 (ooe) superlattice reflections, as marked by an arrow in Fig.…”

Section: Resultsmentioning

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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“…S5). 6 An obvious consequence of these results is to increase the ionic conductivity in NBT 16,17 is given in Fig. 4.…”

Section: Introductory Paragraphmentioning

confidence: 99%

“…NBT has an ABO 3 perovskite-type structure but the crystal chemistry is complex with differences in the average and local structure being reported depending on the characterisation techniques used and whether the samples are ceramics or single crystals [12][13][14][15][16][17][18][19][20][21][22] . On an average scale, based on neutron powder diffraction studies 12 , NBT is reported to exhibit a sequence of phase transitions (on cooling) from a high temperature cubic (space group Pm m), to tetragonal (space group, Pb4m) and then to a room temperature (RT) rhombohedral (space group R3c) structure.…”

Section: Crystal Structure and Ferroelectric Domain Structuresmentioning

confidence: 99%

A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3

et al. 2013

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. et al. (5 more authors) (2014) A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3. Nature Materials, 13 (1). 31 -35. ISSN 147631 -35. ISSN -1122 https://doi.org/10.1038/NMAT3782 eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Introductory paragraphOxide ion conductors find important technical applications in electrochemical devices such as solid oxide fuel cells (SOFCs), oxygen separation membranes and sensors 1-9 . Na 1/2 Bi 1/2 TiO 3 (NBT) is a well-known lead-free piezoelectric material; however, it is often reported to possess high leakage conductivity which is problematic for its piezoand ferroelectric applications 10-15 . Here we report this high leakage to be oxide ion conduction due to Bi-deficiency and oxygen vacancies induced during materials processing. Mg-doping on the Ti-site increases the ionic conductivity to ~ 0.01 S cm -1 at 600 o C, improves the electrolyte stability in reducing atmospheres and lowers the sintering temperature. This study not only demonstrates how to adjust the nominal NBT composition for dielectric-based applications, but also, more importantly, gives [10][11][12][13][14][15] . NBT exhibits maximum relative permittivity,  r ~ 3000 at ~ 320 o C (T max ) and possesses a distorted perovskite structure with extensive chemical, cationdisplacement and octahedral tilt disorder. 14 The resulting complex nanodomain structure is well known to facilitate high and temperature stable permittivity behaviour which is suitable for the fabrication of high temperature ceramic capacitors in addition to easy phase switching under the application of a large electric field which creates large strains suitable for actuator applications [10][11][12][13][14][15] . One drawback of NBT for piezoelectric and capacitor applications, however, is its high leakage conductivity 10,11 . The piezoelectric properties and room temperature dc conductivity depend on the nominal starting composition 10,11 , the origin of which has not been resolved. Here we report on the surprising and dramatic sensitivity of the ionic and electronic transport properties of NBT on low levels of A-site nonstoichiometry in the nominal starting composition. We demonstr...

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A transmission electron microscopy study of the A-site disordered perovskite Na0.5Bi0.5TiO3

Cited by 217 publications

References 24 publications

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

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

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

A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3

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