Structural and ferroelectric properties of perovskite Pb(1−x)(K0.5Sm0.5)xTiO3 ceramics

Yadav, Arun Kumar; Anita, Anita; Kumar, Sunil; Panchwanee, Anjali; Reddy, V. Raghavendra; Shirage, Parasharam M.; Biring, Sajal; Sen, Somaditya

doi:10.1039/c7ra07130b

Cited by 33 publications

(3 citation statements)

References 56 publications

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“…As such, the form of the potential is fundamental to modelling ferroelectric and multiferroic materials. For example, the perovskite PbTiO 3 transitions from a high-temperature non-ferroelectric Pm 3m cubic phase to a ferroelectric P4mm tetragonal phase at 763 K, driven by a single zone-centre phonon mode with an associated double-well potential [30,31].…”

Section: Imaginary Phonon Modesmentioning

confidence: 99%

The physical significance of imaginary phonon modes in crystals

Pallikara¹,

Kayastha²,

Skelton³

et al. 2022

Electron. Struct.

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The lattice vibrations (phonon modes) of crystals underpin a large number of material properties. The harmonic phonon spectrum of a solid is the simplest description of its structural dynamics and can be straightforwardly derived from the Hellman-Feynman forces obtained in a ground-state electronic structure calculation. The presence of imaginary harmonic modes in the spectrum indicates that a structure is not a local minimum on the structural potential-energy surface and is instead a saddle point or a hilltop, for example. This can in turn yield important insight into the fundamental nature and physical properties of a material. In this review article, we discuss the physical significance of imaginary harmonic modes and distinguish between cases where imaginary modes are indicative of such phenomena, and those where they reflect technical problems in the calculations. We outline basic approaches for exploring and renormalising imaginary modes, and demonstrate their utility through a set of three case studies in the materials sciences.

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Section: Imaginary Phonon Modesmentioning

confidence: 99%

The physical significance of imaginary phonon modes in crystals

Pallikara¹,

Kayastha²,

Skelton³

et al. 2022

Electron. Struct.

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“…The Raman spectroscopy is frequently employed to probe the subtle structural distortions induced both by the tilting of octahedra and by the cationic displacements in perovskites and other related compounds. [54][55][56][57] Fig. 3(a) shows the room temperature Raman spectra of (1 À x)KNN-(x)BZT (x ¼ 0.00 to 0.10) samples in the wavenumber range of 50-1000 cm À1 .…”

Section: Structural Propertiesmentioning

confidence: 99%

Structure, dielectric, and piezoelectric properties of K_0.5Na_0.5NbO₃-based lead-free ceramics

2018

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“…Figure a shows the frequency dependencies of the dielectric permittivity and loss tangent of the as-prepared (nonmagnetized) SFO and SFN3O samples in the THz band. The permittivity of both hexaferrites is nearly independent of the frequency due to a large ionic polarization and partly because of electronic polarization within the 0.2–0.8 THz range. A slightly higher value of ε′ and tan δ of SFN3O can be attributed to the smaller grain size effect, reduced coercive field, and higher concentration of the ferrimagnetic active regions at THz frequencies.…”

Section: Resultsmentioning

confidence: 99%

Terahertz Faraday Rotation of SrFe₁₂O₁₉ Hexaferrites Enhanced by Nb Doping

Stenning

Kovaľ

et al. 2022

ACS Appl. Mater. Interfaces

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The magneto-optical and dielectric behavior of M-type hexaferrites as permanent magnets in the THz band is essential for potential applications like microwave absorbers and antennas, while are rarely reported in recent years. In this work, single-phase SrFe12–x Nb x O19 hexaferrite ceramics were prepared by the conventional solid-state sintering method. Temperature dependence of dielectric parameters was investigated here to determine the relationship between dielectric response and magnetic phase transition. The saturated magnetization increases by nearly 12%, while the coercive field decreases by 30% in the x = 0.03 composition compared to that of the x = 0.00 sample. Besides, the Nb substitution improves the magneto-optical behavior in the THz band by comparing the Faraday rotation parameter from 0.75 (x = 0.00) to 1.30 (x = 0.03). The changes in the magnetic properties are explained by a composition-driven increase of the net magnetic moment and enhanced ferromagnetic exchange coupling. The substitution of the donor dopant Nb on the Fe site is a feasible way to obtain multifunctional M-type hexaferrites as preferred candidates for permanent magnets, sensors, and other electronic devices.

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Structural and ferroelectric properties of perovskite Pb_(1−x)(K_0.5Sm_0.5)_xTiO₃ ceramics

Abstract: PbTiO3 has the highest tetragonal distortion (c/a ∼ 1.064) and highest spontaneous polarization among perovskite titanates.

Cited by 33 publications

References 56 publications

The physical significance of imaginary phonon modes in crystals

The physical significance of imaginary phonon modes in crystals

Structure, dielectric, and piezoelectric properties of K_0.5Na_0.5NbO₃-based lead-free ceramics

Terahertz Faraday Rotation of SrFe₁₂O₁₉ Hexaferrites Enhanced by Nb Doping

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Structural and ferroelectric properties of perovskite Pb(1−x)(K0.5Sm0.5)xTiO3 ceramics

Abstract: PbTiO3 has the highest tetragonal distortion (c/a ∼ 1.064) and highest spontaneous polarization among perovskite titanates.

Cited by 33 publications

References 56 publications

The physical significance of imaginary phonon modes in crystals

The physical significance of imaginary phonon modes in crystals

Structure, dielectric, and piezoelectric properties of K0.5Na0.5NbO3-based lead-free ceramics

Terahertz Faraday Rotation of SrFe12O19 Hexaferrites Enhanced by Nb Doping

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Structural and ferroelectric properties of perovskite Pb_(1−x)(K_0.5Sm_0.5)_xTiO₃ ceramics

Structure, dielectric, and piezoelectric properties of K_0.5Na_0.5NbO₃-based lead-free ceramics

Terahertz Faraday Rotation of SrFe₁₂O₁₉ Hexaferrites Enhanced by Nb Doping