High aspect ratio piezoelectric strontium–bismuth–tantalate nanotubes

Morrison, Finlay D.; Ramsay, Laura; Scott, J. F.

doi:10.1088/0953-8984/15/33/103

Cited by 94 publications

(61 citation statements)

References 17 publications

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“…The substantial progress in synthesis of various ferroelectrics nanosystems, like epitaxial films [4], nanoparticles with controllable sizes [5], arrays of tubes and rods [6][7][8][9], the local characterization of their polar properties [10][11][12] and domain structure [13], triggered the renovation of interest to ferroic nanosystems theoretical description. It is worth to note the enormous achievements of both the phenomenological [14] and microscopic [15] theories, their recent advances in different fields like the description of nanorods [16,17], size effects in thin films [18,19], ferroelectric nanoparticles [20][21][22]; flexoelectric effect influence on the intrinsic properties [23,24] and response [25][26][27] of the nanosystems; the developed analytical model accounting for depolarization field as well as the formation of misfit dislocations [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

General approach for the description of size effects in ferroelectric nanosystems

Eliseev

Morozovska

2009

J Mater Sci

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We propose general analytical approach for the description of size effect influence on polarization and dielectric susceptibility in ferroelectric nanosystems based on the two-parametric direct variational method and Landau-Ginzburg-Devonshire phenomenology. The essence of the approach is to solve Euler-Largange boundary problem for polarization distribution exactly in paraelectric phase without ferroelectric nonlinearity and then to use the linearized solution for derivation of the approximate analytical expression for spontaneous polarization distribution in ferroelectric phase with the average polarization and characteristic spatial scale as variational parameters. Corresponding polarization distributions calculated within the approach in thin ferroelectric films, nanowires and nanotubes were compared with the available exact solution of Landau-Ginzburg-Devonshire equation or approximate results obtained earlier from the one parametric solution. Perfect agreement between the exact solution and obtained approximate ones is demonstrated. The realization of the proposed scheme of the two-parametric direct variational method seems even simpler than the one-parametric scheme based on the Landau-Ginzburg-Devonshire free energy expansion with renormalized coefficients, while the validity range of two-parametric solution is much wider and the accuracy is higher. So, obtained analytical results have methodological importance for calculation of the phase diagram size effects, polarization distribution, all related polar, dielectric, piezoelectric and pyroelectric properties of single-domain ferroelectric nanoparticles and thin films. The proposed method is applicable to different ferroic nanosystems.

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Section: Introductionmentioning

confidence: 99%

General approach for the description of size effects in ferroelectric nanosystems

Eliseev

Morozovska

2009

J Mater Sci

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“…The ferroelectric phase was studied in ferroelectric nanowires, nanotubes and nanorods [1], [2], [3], [4], [5]. It is appeared that nanorods and nanowires posses such polar properties as remnant polarization and piezoelectric hysteresis [1], [2], [5].…”

Section: Introductionmentioning

confidence: 99%

Size effects and depolarization field influence on the phase diagrams of cylindrical ferroelectric nanoparticles

Morozovska

Eliseev

Glinchuk

2007

Physica B: Condensed Matter

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Ferroelectric nanoparticles of different shape and their nanocomposites are actively studied in modern physics. Because of their applications in many fields of nanotechnology, the size effects and the possible disappearance of ferroelectricity at a critical particle volume attract a growing scientific interest. In this paper we study the size effects of the cylindrical nanoparticle phase diagrams allowing for effective surface tension and depolarization field influence. The Euler-Lagrange equations were solved by direct variational method. The approximate analytical expression for the paraelectricferroelectric transition temperature dependence on nanoparticle sizes, polarization gradient coefficient, extrapolation length, effective surface tension and electrostriction coefficient was derived. It was shown that the transition temperature could be higher than the one of the bulk material for nanorods and nanowires in contrast to nanodisks, where the decrease takes place. The critical sizes and volume of ferroelectric-paraelectric phase transition are calculated. We proved that among all cylindrical shapes a nanobar reveals the minimal critical volume. We predicted the enhancement of ferroelectric properties in nanorods and nanowires. Obtained results explain the observed ferroelectricity enhancement in nanorods and could be very useful for elaboration of modern nanocomposites with perfect polar properties.

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“…10,11,[30][31][32][33][34][35] For example, piezoelectric nanotubes with perovskite-structure are used for the construction of 3D memory devices. 36) The hierarchic 3D structures with high storage density have large potentials for a variety of applications in addition to those in ferroelectric memory devices. Moreover, it has recently been found that novel organic-inorganic hybrid liquid crystals could be fabricated by using monodispersed TiO 2 37) or -Fe 2 O 3 38) particles with characteristic morphologies.…”

Section: Shape Control Of Bnt Particles By the Changing Ofmentioning

confidence: 99%

Synthesis of Bismuth Sodium Titanate Fine Particles with Different Shapes by the Gel-Sol Method

et al. 2007

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Polycrystalline spherical Bi 0:5 Na 0:5 TiO 3 (BNT) particles with narrow size distributions were obtained by the gel-sol method, where the precursory gel was composed of BiX 3 (X ¼ OH, NO 3 ), NaOH, and stable Ti 4þ complex which was prepared by mixing Ti(i-C 3 H 7 O) 4 with triethanolamine to inhibit the uncontrolled hydrolysis in aqueous solution. The resulting morphology was readily controlled as single-crystalline rod-like and tubular shapes with the simple tuning of the Bi/Ti molar ratios in the presence of NaClO 4 .

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High aspect ratio piezoelectric strontium–bismuth–tantalate nanotubes

Cited by 94 publications

References 17 publications

General approach for the description of size effects in ferroelectric nanosystems

General approach for the description of size effects in ferroelectric nanosystems

Size effects and depolarization field influence on the phase diagrams of cylindrical ferroelectric nanoparticles

Synthesis of Bismuth Sodium Titanate Fine Particles with Different Shapes by the Gel-Sol Method

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