Investigations on Fe doped Ba0.95Sr0.05TiO3 single phase magnetodielectric compounds

Abstract

The paper reports synthesis, crystal structure, dielectric properties, P-E hysteresis loops, M-H hysteresis loops and magnetodielectric properties of Fe doped Ba 0.95 Sr 0.05 TiO 3 (0.05BST) single phase magnetodielectric compositions. The parent and doped 0.05BST compositions are synthesized via ceramic route of synthesis. The studies on crystal structure show that the parent composition (0.05BST) show a tetragonal crystal structure, while the substitution of Fe is observed to exhibit a cubic crystal structure with a tetragonal distortion. The investigations on dielectric properties show that the Fe doped 0.05BST show a diffused phase transition and T c approaches room temperature as the level of doping is increased. The studies on P-E and M-H hysteresis loops are carried out to confirm simultaneous presence of both the ferroelectric and ferromagnetic orders in a Fe doped 0.05BST. All the Fe doped compositions are found to exhibit a significant magnetodielectric coupling at room temperature.

Structural and dielectric properties of iron doped barium strontium titanate for storage applications

“…At a higher doping level (0.1), an increase in the frequency led to a decrease in dielectric constant values due to the suppressing and broadening in the phase transition peak. The results are comparable to what reported in [18,19] in terms of dielectric constant and better in terms of dielectric loss.…”

Effect of Ni Substitution on Structural, Dielectric, and Ferroelectric Properties and Variation in Magnetocapacitance of Single-Phase Ba0.7Pb0.3TiO3 Ceramic

“…This sudden increase in the material over a higher temperature range at certain applied frequencies implies the dominance of interfacial polarization. 3,12 The dielectric loss tangent observed at a lower frequency range in the case of Ba 0.7 Pb 0.3 TiO 3 has the aforementioned increase at a lower temperature (∼85 °C), similar to that observed in the dielectric constant behavior. Interestingly, a lower value of the dielectric loss was noted for the samples with Ni substitution, which is as expected and indicates the formation of extrinsic oxygen vacancies.…”

“…Additionally, in this parent ferroelectric phase, a broad dispersion peak was observed at approximately 70 °C in the lower frequency range, which is attributed to the micro-chemical inhomogeneity in the sample and intergrain interfacial polarization, which is prominent at a lower range of frequencies. 3 At a higher range frequency (100 kHz and 1 MHz), this lower temperature dispersion peak disappears, and only the highest dielectric constant peak of the ferroelectric-paraelectric transition was detected. However, with the substitution of Ni 2+ ions in Ba 0.7 Pb 0.3 TiO 3 , this lower temperature dispersion peak was not observed in any frequency range; instead, the ferroelectric-paraelectric transition temperature shifted downwards at the observed Curie temperatures of 265, 215, and 163 °C for Ni contents of 0.05, 0.1, and 0.15, respectively.…”

“…The second approach involves the fabrication of superlattices of those phases, whereas in the third case, ions of magnetic phases, such as Co, Fe, Ni, and Mn, are substituted in the ABO 3 -type ferroelectric perovskite lattice. 2,3 Among piezoelectric materials, barium titanate (BaTiO 3 ) is a widely applicable piezoelectric material that has great potential for use in multifunctional devices owing to its excellent dielectric, ferroelectric, and piezoelectric properties. In general, BaTiO 3 ceramic is combined with special additives such as Ca 2+ , Sr 2+ , and Pb 2+ to tune its basic properties to make it applicable for various applications.…”

Magnetodielectric Effect in Microwave-Sintered Ba0.8Sr0.2TiO3 and Co0.9Ni0.1Fe2O4 Composite

“…In a piezomagnetic material, if is positive, the stress increases with an increase in the applied magnetic field (H), whereas if it is negative, the stress decreases [14]. An increase in stress results in a decrease in the dielectric constant, which can be explained on the basis of Grindev's effect [15], and dielectric constant increases with a decrease in stress, which can be explained by the Catalan-type effect [16]. As shown in Figs.…”