Enhancement in physical properties of barium hexaferrite with substitution

Abstract

Abstract

Structural, Dielectric, and Magneto‐Optical Properties of Al‐Cr Substituted M‐Type Barium Hexaferrite

“…Heat treatment or synthesis methods may be the reason for the increment of porosity. The observed values of lattice parameters are in agreement with those observed in the literature …”

“…This behavior can be explained on the basis of Maxwell‐Wagner model which assumed ferrites to be made up of conducting grains separated by insulating grain boundaries . When electric field is applied, charge carriers are displaced from their mean position; the charge carriers align themselves at grain boundaries if the grain boundaries have more resistance as compared to the grains . This scenario causes the surface charges to gather at the interface of the grain boundaries thereby resulting in interfacial polarization and consequently large dielectric constant.…”

“…The Fe 3 + ions are responsible for the magnetic properties of the structure and occupy trigonal bipyramidal site (2b), tetrahedral site (4f1), and octahedral site (12k, 2a, and 4f2). In these crystallographic sites, the 4f1 and 4f2 sites have spin down which is responsible of the decrease in the magnetic moment of the structure . To improve the properties of hexaferrite, Fe 3+ ions can be replaced by a cation such as transition metals.…”

Optical and Multiferroic Properties of Gd‐Co Substituted Barium Hexaferrite

“…It is well established fact, physical properties of barium hexaferrite can be tailored by substituting different ions like Ti-Ru, Ni-Ti, Al, Co-Zr, Ga, Co-Ti, Mn-Mo, Cr, Zr-Zn, Co-Sn, Ni-Ru, Sc and Co-Ti for Ba ++ and Fe +++ . [4][5][6][7][8][9][10][11][12][13][14] Therefore, microwave absorption performance can be controlled or adjusted with substitution.…”

Band gap tuning of BaFe 12 O 19 with Mg and Mn doping to enhance solar light absorption for photocatalytic application

“…The band appeared at 435 and 580 cm −1 were assigned to the Fe‐O and Ba‐O vibration in the octahedral and tetrahedral site of pure barium hexaferrites material. The band in 1100‐1500 cm −1 range was associated to metal‐oxygen‐metal such as Ba‐O‐Ba and Fe‐O‐Fe bands 36 . The captivating peak around 1398 cm −1 corresponds to the characteristic band of NO 3− group, the bending mood of H 2 O is attributed to hydrogen bonded O‐H stretching located around 1693 cm −1 and the vibrational peak at about 1744 cm −1 corresponds to the overtone band.…”