Raman scattering from La-substituted BiFeO3–PbTiO3

Mishra, K. K.; Sivasubramanian, V.; Sarguna, R. M.; Ravindran, T. R.; Arora, Akhi̇lesh

doi:10.1016/j.jssc.2011.07.014

Cited by 41 publications

(36 citation statements)

References 39 publications

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“…5 The group theoretical mode analysis predicts 13 modes, i.e., U opt ¼ 4A 1 þ 9E, where A 1 and E modes are both Raman and infrared active. 32,33 Since the BFO-DMO has the same rhombohedral symmetry up to x ¼ 0.075 as in BFO, those predicted modes are also expected for these systems. Fig.…”

Section: B Raman Spectroscopic Studiesmentioning

confidence: 70%

“…With increase in x, the randomness of A-site occupancy by Bi/Dy and of the B-site by Fe/Mn increases, and as a result, a distribution of bond lengths of ions often causes broadening. 33 Although one can expect a signature of extra Raman-activated phonons due to the contribution of lower symmetry orthorhombic phase fraction Pn2 1 a for x > 0.075, we could not identify such features. The difficulty in identifying such phonon modes is due to the significant inhomogeneous broadening of Raman bands and mixed selection rules of those modes.…”

Section: B Raman Spectroscopic Studiesmentioning

confidence: 72%

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Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics

Tripathy

Pradhan

Mishra

et al. 2015

Journal of Applied Physics

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Impedance and AC conductivity study of nano crystalline, fine grained multiferroic bismuth ferrite (BiFeO3), synthesized by microwave sintering AIP Advances 5, 097164 (2015) We report systematic studies on crystal structure and magneto-dielectric properties of (1 À x) BiFeO 3 -x DyMnO 3 (0.0 x 0.2) nanoceramics synthesized by auto-combustion method. Rietveld refinement of X-ray diffraction data indicates a structural transition from R3c to R3c þ Pn2 1 a at x ¼ 0.1. Field emission scanning electron micrographs display a decrease in grain size with increase in x. The presence of dielectric anomalies around antiferromagnetic transition temperature implies the magnetoelectric coupling. Dielectric measurements showed decrease in magnetic ordering temperature with increasing x in agreement with differential scanning calorimetry results. A significant increase in magnetization has been found with increasing DyMnO 3 substitution. Magnetoimpedance spectroscopy reveals a significant change ($18%) in dielectric permittivity at H ¼ 2 T for x ¼ 0.2. V C 2015 AIP Publishing LLC. [http://dx

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Section: B Raman Spectroscopic Studiesmentioning

confidence: 70%

Section: B Raman Spectroscopic Studiesmentioning

confidence: 72%

Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics

Tripathy

Pradhan

Mishra

et al. 2015

Journal of Applied Physics

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“…Freezing of the nanoclusters resulted in a residual magnetization (weak ferromagnetic state) at low temperatures. The effect of La-doping on the properties of (1-y)BiFeO 3 -yPbTiO 3 conventionally prepared ceramics with grains of micrometer size have been studied by many authors [21][22][23][24][25][26][27][28][29][30]. Cheng et al reported magnetic ordering, a downward shift of the ferroelectric Curie temperature and a decrease in the tetragonality with increasing La content in 0.45BiFeO 3 -0.55PbTiO 3 solid solution [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…Cheng et al reported magnetic ordering, a downward shift of the ferroelectric Curie temperature and a decrease in the tetragonality with increasing La content in 0.45BiFeO 3 -0.55PbTiO 3 solid solution [21,22]. The properties of (Bi 1-x La x FeO3) 0.5 (PbTiO 3 ) 0.5 ceramics with lanthanum content 0≤x≤0.5 have been studied by Singh et al and by Mishra et al [23,[25][26][27]30]. Singh et al reported enhanced magnetoelectric coupling and relaxor-like behavior at low temperature for x=0.5 and resolved its average room temperature structure as cubic with Pm3m space group [23].…”

Section: Introductionmentioning

confidence: 99%

“…Singh et al reported enhanced magnetoelectric coupling and relaxor-like behavior at low temperature for x=0.5 and resolved its average room temperature structure as cubic with Pm3m space group [23]. Successive papers on (Bi 1-x La x FeO 3 ) 0.5 (PbTiO 3 ) 0.5 ceramics by Mishra et al were however confusing since the authors reported ferroelectric properties and Raman scattering in the cubic symmetry for x≥0.4 at room temperature [25][26][27]. The situation has been elucidated by the results of powder neutron and X-ray diffraction data establishing the room temperature structure of (Bi 0.5 La 0.5 FeO 3 ) 0.5 (PbT i O 3 ) 0.5 as rhombohedral with space group R3c [30].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and magnetic properties of (Bi1-xLaxFeO3)0.5(PbTiO3)0.5 ceramics prepared by high energy mechanochemical technique

et al. 2015

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Multiferroic (Bi 1-x La x FeO 3 ) 0.5 (PbTiO 3 ) 0.5 ceramics with x = 0, 0.1, 0.2, 0.3 and 0.5 was prepared from mechanochemically synthesized nanopowders. The XRD studies revealed the tetragonal structure for x≤0.2 and rhombohedral for x=0.5 with mean grain sizes from 15 to 28 nm. Dielectric response of the compounds in the temperature range 125-525 K was found to contain two anomalies: at~400 K attributed to the presence of oxygen vacancies and that below 300 K characteristic of ferroelectric relaxors; the Curie point anomaly was apparent at 500 K only for samples with x=0.5. Analysis of the low-temperature response enabled us to characterize the relaxor state of the solid solution and to yield information on the decrease in the activation energy of dipole moment flipping in polar nanoregions. Magnetic studies revealed two contributions to the magnetization of the nanoceramics pointing to a coexistence of weak ferromagnetic and antiferromagnetic orderings in the range 4÷300 K. Low temperature variation of the magnetization in field-cooling and zero-field-cooling conditions revealed spin glass behavior which in (Bi 1-x La x FeO 3 ) 0.5 (PbTiO 3 ) 0.5 is dependent on x. Moreover, a sharp step in magnetization at~250 K was found to be dependent on the La content and related to the A-site distortion leading to a modification of Fe-O-Fe angles and antiferromagnetic coupling between magnetic Fe 3+ moments.

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Ultralow Electrical Hysteresis along with High Energy‐Storage Density in Lead‐Based Antiferroelectric Ceramics

Huang

Yan

et al. 2020

Adv Elect Materials

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materials (FE), relaxor ferroelectric materials, and antiferroelectric materials (AFEs). [2][3][4][5][6][7] Among them, antiferroelectric materials are preferred candidates for obtaining an exceptional energy storage density due to the high saturation polarization (P s ) and zero remnant polarization (P r ). [7] A schematic illustration of the energy storage mechanism of antiferroelectric materials is shown in Figure S1 in the Supporting Information. The W tot and W rec of antiferroelectrics are calculated by the area between the phase switching loop and the polarization axis and can be described by the following equations [7,8] where P max , P r , and E represent the maximum polarization, the remnant polarization, and applied electric field, respectively. The difference between W rec and W tot represents the energy dissipation (W loss ) and the ratio of W rec to W tot is defined as the energy efficiency, which can be described by the following equation [7,8] 100% 100% rec tot rec rec l ossIn comparison with lead-free antiferroelectric ceramics, PbZrO 3 -based antiferroelectric ceramics have always been a more popular topic because of their superior energy storage performance. It is particularly interesting that a minor variation of doping ions at the A or B site of the perovskite (ABO 3 ) structure may display huge differences in materials properties. Hence, scholars have continuously focused on investigating the structure-property relationships of PbZrO 3 -based AFE ceramics, such as tailoring the phase transition characteristics of AFE ceramics via ions doping, or utilizing unique fabrication methods to increase the energy storage density, and so forth. [8][9][10][11][12] Recently, a record-high recoverable energy storage density of 11.18 J cm −3 was obtained in Sr-doped (Pb 0.94 La 0.02 Sr 0.04 )(Zr 0.9 Sn 0.1 ) 0.995 O 3 AFE ceramics that prepared by tape-casting method. [9] However, the large electrical hysteresis resulted from the first-order antiferroelectric-ferroelectric (AFE-FE) phase transition has always been an apparent drawback of AFE ceramics, [13] leading to the high energy dissipation, Antiferroelectric ceramics with extraordinary energy-storage density have gained exponentially soaring attention for their applications in pulsed power capacitors. Nevertheless, high energy dissipation is a deficiency of antiferroelectric materials. The modulation of Ba/La-doped (Pb 0.91 Ba x La 0.06−2x/3 ) (Zr 0.6 Sn 0.4 )O 3 (x = 0.015, 0.03, 0.045, 0.06) antiferroelectric ceramics is aimed at increasing the energy efficiency and obtaining an ideal energy storage density. The traditional solid-state reaction is exploited for ceramics fabrication and all prepared samples exhibit an ultralow electrical hysteresis due to the local structural heterogeneity, as verified by Raman spectroscopy. Of particular importance is the fact that the (Pb 0.91 Ba 0.045 La 0.03 )(Zr 0.6 Sn 0.4 ) O 3 ceramic possesses an excellent recoverable energy storage density (W rec = 8.16 J cm −3 ) and a remarkable energy efficiency (η = 92.1...

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Raman scattering from La-substituted BiFeO3–PbTiO3

Cited by 41 publications

References 39 publications

Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics

Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics

Dielectric and magnetic properties of (Bi1-xLaxFeO3)0.5(PbTiO3)0.5 ceramics prepared by high energy mechanochemical technique

Ultralow Electrical Hysteresis along with High Energy‐Storage Density in Lead‐Based Antiferroelectric Ceramics

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