Local structural disorder and its influence on the average global structure and polar properties in Na<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow/><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:math>Bi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow/><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:math>TiO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml

Rao, Badari Narayana; Datta, Ranjan; Chandrashekaran, S. Selva; Mishra, Dileep Kumar; Sathe, Vasant; Senyshyn, Anatoliy; Ranjan, Rajeev

doi:10.1103/physrevb.88.224103

Cited by 208 publications

(86 citation statements)

References 75 publications

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“…This transition is not well defined due to its diffuse nature and the crystal structure of BNT at room temperature is not yet settled. Various structural models have been proposed, such as the Cc phase, mixed R 3 c + Cc phase, R 3 c matrix with localized in-phase (+) tilted octahedral regions, etc 2122232425. Interestingly, the application of a strong electric field can produce an irreversible transformation from Cc or mixed R 3 c + Cc to single R 3 c phase.…”

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confidence: 99%

Origin of anomalous giant dielectric performance in novel perovskite: Bi0.5−xLaxNa0.5−xLixTi1−yMyO3 (M = Mg2+, Ga3+)

Liu

Fan

Shi

et al. 2015

Sci Rep

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Dielectric properties and dielectric relaxation behaviors of A/B sites co-substituted Bi0.5Na0.5TiO3 perovskite-type ferroelectrics are reported. The Bi0.5−xLaxNa0.5−xLixTi1−yMyO3 (M = Mg2+, Ga3+) exhibits anomalous giant dielectric permittivity (ε’) of ~105 under a heterogeneous constitution with easily discernible grain and grain boundary conductivity. The lone pairs substitution theory as well as extrinsic disorders are used to clarify the significant structural evolution and the origin of the dielectric performance. A bigger free volume promotes the anomalous relaxation between oxygen sites, and the polarization direction on the nanoscale deviates from the average polarization direction at its ferroelectric state. Furthermore, no obvious phase transition indicates the considerable static substitutional disorder at the Bi/Na sites, which facilitates delocalized conduction of oxygen ions in the intermediate temperature range.

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confidence: 99%

Origin of anomalous giant dielectric performance in novel perovskite: Bi0.5−xLaxNa0.5−xLixTi1−yMyO3 (M = Mg2+, Ga3+)

Liu

Fan

Shi

et al. 2015

Sci Rep

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“…In general, researchers avoid long time E-poling in the samples for piezoelectric sensors and actuators applications. [20][21][22][23][24] However, it is also true that built-in hysteresis loops are widely used to decrease hysteresis and self heating in hard piezoelectrics. 25 Takenaka group has carried out extensive studies on polarization, phase transition, dielectric and electrical properties of (1 À x)NBT-xBiAlO 3 solid solution with pre intended Al substitution at B-site.…”

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confidence: 99%

Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics

Borkar

Tomar

Gupta

et al. 2015

Applied Physics Letters

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“…The fact that the Cc distortion completely vanishes after poling suggests that Cc is not likely to be a thermodynamic phase of NBT at room temperature. Subsequent studies associated the monoclinic (Cc) like average distortion to the presence of R3c incompatible short ranged in-phase (a 0 a 0 c + ) octahedral tilts [30,31], and displacements of Na/Bi cation away from the [111] polar direction of the R3c phase [27]. In the process of establishing a long range ferroelectric order, strong electric field "wipes away" the positional disorder and the associated structural heterogeneity on the mesoscopic scale, leaving the system in a pure rhombohedral ferroeletric phase [32].…”

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confidence: 99%

Tuning Photoluminescence Response by Electric Field in Electrically Soft Ferroelectrics

2016

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We show that an electrically soft ferroelectric host can be used to tune the photoluminescence (PL) response of rare-earth emitter ions by external electric field. Photoluminescence (PL) property of lanthanide ions is a subject of continuing interest because of its enormous applications in lighting industry, Laser, fiber optics telecommunications, biological assaying and medical imaging [1,2]. The most common strategy prevalent among experimentalists is to investigate the PL response/mechanisms by placing the luminescent centers in different kinds of host matrices or ligand environments. Among others, crystallographic symmetry of the host crystal is one of the important factors that influences PL emission in solids [3]. As such, temperature, pressure, and compositional modifications which can induce crystallographic transformations can, as well, affect the PL response. In general, pressure induced phase transformations in inorganic materials occur at Giga Pascal pressure ranges which is not easily achievable under ordinary conditions. From a device point of view, it is always desirable to tune/control properties around the ambient temperature and pressure conditions. In principle, it can be argued that if, apart from temperature and pressure, other control parameters are available to change the crystal structure, this parameter can as well tune different types of structure-sensitive properties, including PL. Such a scenario does exist in electrically and elastically soft ferroelectrics in the proximity of a ferroelectric instability. The electromechanical softness of the lattice, in conjunction with the strong coupling of polarization with crystal structure, makes such systems amenable to field induced structural transformation [4][5][6][7][8][9][10][11][12][13]. The consequent change in the crystal field parameters is expected to affect the PL response of doped emitter ions, such as the rare earth ions, if they are embedded in such a ferroelectric host. Apart from serving as probes to understand the local structural changes due to external influences such as temperature, pressure, electric field, etc., rare-earth doping of soft ferroelectrics can form a new class of multifunctional materials, which may be termed as "luminescent-piezoelectric", based on which new applications can be envisaged. With this as the motivation, and to demonstrate the proof of this concept, we have studied the electric field effect

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Local structural disorder and its influence on the average global structure and polar properties in Na0.5Bi0.5TiO

Cited by 208 publications

References 75 publications

Origin of anomalous giant dielectric performance in novel perovskite: Bi0.5−xLaxNa0.5−xLixTi1−yMyO3 (M = Mg2+, Ga3+)

Origin of anomalous giant dielectric performance in novel perovskite: Bi0.5−xLaxNa0.5−xLixTi1−yMyO3 (M = Mg2+, Ga3+)

Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics

Tuning Photoluminescence Response by Electric Field in Electrically Soft Ferroelectrics

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