Studies on multiferroic properties of single phasic Bi_0.85Ho_0.05Sm_0.1FeO₃ ceramics

Abstract

Single-phase polycrystalline Bi[Formula: see text]Ho[Formula: see text]Sm[Formula: see text]FeO3 ceramic is prepared by conventional solid state route. The co-doping of Sm and Ho (via Bi site) in BiFeO3 controls the formation of secondary phases. The Rietveld refinement analysis shows an increasing trend in tilt angle due to the rotation of FeO6 octohedra with respect to host BiFeO3. The remanent polarization and the magnetization of Bi[Formula: see text]Ho[Formula: see text]Sm[Formula: see text]FeO3 ceramic are found to be significantly improved than BiFeO3 and Bi[Formula: see text]Sm[Formula: see text]FeO3 at room-temperature. Considerable variations in the remanent polarization (0.18 to 0.11 [Formula: see text]C/cm2) on magnetic poling and a dielectric anomaly in the vicinity of the antiferromagnetic transition temperature are due to the intrinsic magnetoelectric coupling effect in Bi[Formula: see text]Ho[Formula: see text]Sm[Formula: see text]FeO3 ceramic. The dielectric permittivity increases with increase in applied magnetic field and the coupling coefficient of Bi[Formula: see text]Ho[Formula: see text]Sm[Formula: see text]FeO3 ceramic is found to be 0.91% at 4 kOe.

Oxygen octahedra distortion‐induced multiferroic properties of Er and Zr co‐doped BiFeO3 nanoparticles

“…Figure 1A presents the X‐ray diffraction (XRD) patterns of Bi 1− x Er x Fe 1− y Zr y O 3 ( x = 0, .05, .1; y = 0, .02, .05) polycrystalline samples. The predominant peaks corresponding to (1 0 4) and (1 1 0) planes around 2 θ = 32° confirm the crystallization of the rhombohedral phase ( R 3 c space group) in all the measured samples 18 . The enlarged images of predominant peaks around 32° for all the samples are shown in Figure 1B.…”

“…Here, the maximum magnetization of Bi 1−x Er x Fe 1−y Zr y O 3 (x = .05, .1; y = 0, .02, .05) at a field of 15 kOe is found to be .14756, .03144, .37558, .12019, .1147, and .06689 emu/g, respectively (Table 4), which is relatively higher than pristine BiFeO 3 . 18 The magnetization response of all the samples in the M-H loop presents a nonlinear sigmoidal variation up to the maximum applied magnetic field in all the samples. Arrott-Belov-Kouvel (ABK) plot is drawn based on Weiss theory, 37 as shown in Figure 7B to verify the type of magnetic ordering in this sample.…”

“…The predominant peaks corresponding to (1 0 4) and (1 1 0) planes around 2θ = 32 • confirm the crystallization of the rhombohedral phase (R3c space group) in all the measured samples. 18 The enlarged images of predominant peaks around 32 • for all the samples are shown in Figure 1B. The additional peaks around 2θ = 28 ).…”

Strain‐mediated electrical and optical properties of novel lead‐free CuFe2O4–KNbO3 nanocomposite solid solutions: A combined experimental and Density Functional Theory studies

“…Hence the dielectric permittivity is relatively high in all three nanocomposites. At higher frequencies, the dielectric permittivity can respond to the electronic polarization in which the polarization is unable to correlate with the applied electric field leading to a lower value of dielectric permittivity (Pradhan et al, 2018; Pandey, et al, 2018; Rajesh et al, 2018). The room temperature dielectric permittivity of KNbO 3 , CK1, CK2, and CK3 nanocomposites at a frequency of 200 kHz are found to be 438.730, 560.705, 648.279, and 79.045, respectively.…”

Emergence of Multiple Hysteresis Cycles and Polarization Plateaus: A Monte Carlo Investigation of Fullerene-Like System

“…This material combination results in properties that are highly captivating and position it as an attractive candidate for various applications, including multiferroic and spintronic devices. 44,45 A notable characteristic of this bilayer structure is its dielectric behavior. This layer has a significantly higher dielectric constant than BiFeO 3 and Co, according to the authors.…”