Porous silicon-based ferroelectric nanostructures

Мишина, Е. Д.; Воротилов, К. А.; Васильев, В. А.; Сигов, А. С.; Ohta, Nobuto; Nakabayashi, Seiichiro

doi:10.1134/1.1513823

Cited by 24 publications

(24 citation statements)

References 13 publications

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“…Let us qualitatively compare our results with the ones obtained earlier [1], [2], [11] (see Table 1). Table 1 Experiments [1], [11] and ab initio calculations [2] Parameters calculated in the framework of proposed model The applicability of our model to the description of phase transition between cubic paraelectric and tetragonal ferroelectric phases in BT and PZT is for certain.…”

Section: Q Rsupporting

confidence: 69%

“…Table 1 Experiments [1], [11] and ab initio calculations [2] Parameters calculated in the framework of proposed model The applicability of our model to the description of phase transition between cubic paraelectric and tetragonal ferroelectric phases in BT and PZT is for certain. However, it can be only the approximation for improper ferroelastic -ferroelectrics like RS.…”

Section: Q Rmentioning

confidence: 99%

“…It is appeared that nanorods and nanowires posses such polar properties as remnant polarization and piezoelectric hysteresis [1], [2], [5]. Moreover, the confined geometry does not destroy ferroelectric phase as predicted for spherical particles [6], [7] and observed experimentally [8], [9], [10], but sometimes the noticeable enhancement of ferroelectric properties appears in nanocylinders [1], [2], [3], [4], [5], [11] Yadlovker and Berger [1] reported about the spontaneous polarization enhancement up to 0.25-2µC/cm 2 and ferroelectric phase conservation in Rochelle salt (RS) (NaKC 4 H 4 O 6 ·4H 2 O) nanorods (radius about 30nm and height 500nm) up to the material decomposition temperature 55 0 C that is about 30 0 C higher than the one of bulk-size crystals.…”

Section: Introductionmentioning

confidence: 99%

“…Mishina et al [11] revealed that ferroelectric phase exists in PbZr 0.52 Ti 0.48 O 3 (PZT) nanorods with diameter less than 10-20nm. However, earlier Mishra et al [9] demonstrated that the ceramics prepared from the powders of PbZr 0.52 Ti 0.48 O 3 with size about 100 nm had a pseudo-cubic symmetry, but might exhibit a hump in the temperature variation of dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Q Rsupporting

confidence: 69%

Section: Q Rmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…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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Ferroelectric single-crystal nano-rods grown within a nano-porous aluminum oxide matrix

Yadlovker

Berger

2008

J Electroceram

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Growing ferroelectric nano single-crystals with uniform polar direction in-vertical to the substrate plane is of high scientific and technological interest for understanding ferroelectric behavior in small dimensions and developing future devices. Single-crystals of Rochelle Salt (RS) and potassium nitrate (PN), with preferred orientation, were grown inside a highly-dense array of aluminum oxide nano-pores, oriented in-vertical to the substrate plane. Preferred orientation was also obtained for potassium niobate crystals. Under certain conditions, nucleation occurred only at the pore bottom due to a tight control over temperature, liquid composition, and pore size. Nucleation at the bottom is necessary for the formation of identically-aligned singlecrystals within the pores. Non-linear dielectric behavior was observed in the case of RS and PN crystals inside the pore. The pores stabilize the ferroelectric phase of RS up to 30°C above the upper Curie temperature of bulk (24°C). In the case of PN-filled pores, the crystals grow in the nonferroelectric orthorhombic phase. Upon applying an electric field of 200 kV/cm, a transition to the ferroelectric phase occurs, and a hysteresis loop appears. This phenomenon was not observed in bulk PN and is attributed to the effect of the hydrostatic pressure applied by the pore walls combined with the applied electric field.

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Porous silicon-based ferroelectric nanostructures

Cited by 24 publications

References 13 publications

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

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

General approach for the description of size effects in ferroelectric nanosystems

Ferroelectric single-crystal nano-rods grown within a nano-porous aluminum oxide matrix

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