Polarization origin and iron positions in indium doped barium hexaferrites

Труханов, С.В.; Турченко, В. А.; Trukhanova, E.L.; Тишкевич, Д.И.; Иванов, В. М.; Zubar, T.I.; Salem, M.M.; Kostishyn, V.G.; Panina, L.V.; Винник, Д.А.; Gudkova, S.A.

doi:10.1016/j.ceramint.2017.09.172

Cited by 292 publications

(50 citation statements)

References 62 publications

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“…Generally, Ta ions replace Ti ions and the Ta ion (0.65 Å) radius are larger than Ti (0.604Å) [27], which induce an expansion of the crystal structure. Similar phenomena can be seen in indium-doped barium hexaferrites [28]. The temperature dependences of the dielectric constant and dielectric loss tangent at various frequencies of LTO and Ta-LTO single crystals are shown in Figure 7a,b, respectively.…”

Section: Resultssupporting

confidence: 55%

Growth and Dielectric Properties of Ta-Doped La2Ti2O7 Single Crystals

Wang

et al. 2018

Crystals

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High-quality Ta-doped La 2 Ti 2 O 7 (Ta-LTO) single crystal of about 40 mm in length and 5 mm in diameter was successfully prepared by the optical floating zone method. An X-ray rocking curve reveals that the crystal of LTO has excellent crystalline quality. As-grown crystals were transparent after annealing in air and the transmittance is up to 76% in the visible and near-infrared region. X-ray diffraction showed that this compound possessed a monoclinic structure with P2 1 space group. The dielectric properties were investigated as functions of temperature (0~300 • C) and frequency (10 2 Hz~10 5 Hz). Dielectric spectra indicated an increase in the room-temperature dielectric constant accompanied by a drop in the loss tangent as a result of the Ta doping. One relaxation was observed in the spectra of electric modulus, which was ascribed to be related to the oxygen vacancy. The dielectric relaxation with activation energy of 1.16 eV is found to be the polaron hopping caused by the oxygen vacancies.

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Section: Resultssupporting

confidence: 55%

Growth and Dielectric Properties of Ta-Doped La2Ti2O7 Single Crystals

Wang

et al. 2018

Crystals

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“…Materials that simultaneously possess magnetic and electric ferroic orders belong to the multiferroic family and for the last two decades have attracted the attention of researchers in the field of functional oxides and materials science [1][2][3]. Ferrite-based materials, both single-phase [4][5][6] and composite [7][8][9], appear to be very interesting and practically significant. Materials in nanoform are very important at the moment, because they can have electronic properties that are more attractive than their bulk counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, magnetic materials are also of interest in nanoscale magnetic phase separation. It should be noted that functional oxides based on transition metal ions are promising materials for various technological applications as magnetic field sensors, working components in tunable microwave resonators, phase shifters, and other electronic devices and sensors [3,[6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of the Crystal Structure Evolution of BiFeO3–BaTiO3 Ceramics across Structural Phase Transitions

et al. 2020

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Evolution of the crystal structure of ceramics BiFeO3–BaTiO3 across the morphotropic phase boundary was analyzed using the results of macroscopic measuring techniques such as X-ray diffraction, differential scanning calorimetry, and differential thermal analysis, as well as the data obtained by local scale methods of scanning probe microscopy. The obtained results allowed to specify the concentration and temperature regions of the single phase and phase coexistent regions as well as to clarify a modification of the structural parameters across the rhombohedral–cubic phase boundary. The structural data show unexpected strengthening of structural distortion specific for the rhombohedral phase, which occurs upon dopant concentration and temperature-driven phase transitions to the cubic phase. The obtained results point to the non-monotonous character of the phase evolution, which is specific for metastable phases. The compounds with metastable structural state are characterized by enhanced sensitivity to external stimuli, which significantly expands the perspectives of their particular use.

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“…[22,23]. Moreover, a large spontaneous polarization and enhanced multiferroic properties are recently observed in single phase BHF substituted by diamagnetic cations and the magnetoelectric characteristics of M-type hexaferrites synthesized by a modified ceramic technique are found to be more advanced than those obtained for well known room-temperature BiFeO 3 orthoferrite multiferroic [24][25][26][27]. Also they are ferrimagnetic systems having larger magnetostrictive nature [28].…”

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confidence: 99%

Investigation of magnetoelectric effect in lead free K0.5Na0.5NbO3-BaFe12O19 novel composite system

2019

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Lead-free magnetoelectric composites (1 ̶ x)K 0.5 Na 0.5 NbO 3 -(x)BaFe 12 O 19 (x = 30, 40, and 50 wt%) are synthesized using solid state reaction method. X-ray diffraction (XRD) patterns confirm formation of diphase composites. Field emission scanning electron microscopy (FE-SEM) gives information about grain size, connectivity, and microstructure of constituent phases. Dielectric parameters of composite samples are studied as a function of temperature and the transition temperatures corresponding to both the constituent phases are observed in the composite samples. Dielectric constant has been found to decrease with addition of ferrite. Room temperature multiferroic behaviour has been confirmed using P-E and M-H hysteresis loops and magnetoelectric measurement. Polarization is found to decrease; however, magnetization increases with ferrite weight percentage. The highest α ME of 4.08 mV/(cm⋅Oe) is obtained for x = 30 wt% composite and it is realized that ferrite content significantly affects magnetoelectric behaviour.devices [6]. Large scale applications of ME composites given their higher ME coupling than that of single phase materials make them a beguiling research concern. ME coupling in the composites is basically a product property arising due to combination of magnetostrictive (magnetic/mechanical) phenomena in ferrite and piezoelectric (meachanical/electrical) phenomena of ferroelectric phases [7]. ) x [12], etc. are studied in the previous years. Generally for fabrication of good ME composites, the piezoelectric and magnetostrictive coefficients of constituent ferroelectric and ferrite phases should be high respectively. Furthermore high resistivity is equally desirable for avoiding leakage of charges [13]. K 0.5 Na 0.5 NbO 3 (KNN) has been considered as a bright prospect as a ferroelectric constituent for fabrication of lead-free ME composites. KNN exhibits reasonably well ferroelectric, piezoelectric, and dielectric characteristics. It exhibits high piezoelectric charge constant (d 33 ≈ 80-416 pC/N) and a high planar coupling coefficient (k P ≈ 45%) [14][15][16]. It also exhibits large remnant polarization and coercive field (P r = 21 μC/cm 2 , E c = 7.2 kV/cm, P r = 20 μC/cm 2 , and E c = 8 kV/cm) [14,17]. The M-type hexaferrites are widely studied materials due to their unique physical properties. The hexagonal ferrites including BaFe 12 O 19 (BHF) have magneto-plumbite structure. The crystal structure of BHF and diamagnetically doped BHF may be described by two space group viz. P6 3 /mmc (No. 194) and P6 3 mc (No. 186). The latter one is a non-centrosymmetric space group and is generally used to describe the crystal structure in order to explain the existence of non-zero spontaneous polarization [18,19]. These ferrites are usually termed as hard ferrites because of their high electrical resistivity, saturation magnetization, coercivity, and mechanical hardness [20]. At higher frequencies, hexaferrites have low-eddy current losses and high resistivity as compared to other magnetic materials [21]. ...

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Polarization origin and iron positions in indium doped barium hexaferrites

Cited by 292 publications

References 62 publications

Growth and Dielectric Properties of Ta-Doped La2Ti2O7 Single Crystals

Growth and Dielectric Properties of Ta-Doped La2Ti2O7 Single Crystals

Peculiarities of the Crystal Structure Evolution of BiFeO3–BaTiO3 Ceramics across Structural Phase Transitions

Investigation of magnetoelectric effect in lead free K0.5Na0.5NbO3-BaFe12O19 novel composite system

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