La³⁺-Induced Band-Gap Modifications in Barium Hexaferrite: An Investigation of the Structural, Optical, and Dielectric Properties †

Authors

Gowravi Subramanyam, Manipal Institute of Technology
Nishkala Kadambu Rao, Manipal Institute of Technology
Mamatha Durgadas Daivajna, Manipal Institute of Technology

Document Type

Article

Publication Title

Engineering Proceedings

Abstract

M-type barium hexaferrites, BaFe(12−x)LaxO19 (x = 0.0, 0.05, 0.1, 0.15, and 0.2), were prepared by a low-cost solid-state reaction method. The specimens crystallized in a non-centrosymmetric hexagonal magnetoplumbite structure that belonged to the P63/mmc space group. Morphologically, the samples were dense with hexagonal plate-like grains and size variations of around 1.19–1.70 μm. The optical band gap of the system was reduced in the wide band-gap region from 1.78 to 1.74 eV. The band-gap values would be useful in photocatalysis and photovoltaics. The AC conductivity was enhanced with La3+ substitution, following Jonscher’s power law. Maxwell–Wagner-type polarization was observed in the specimen, and tangent loss decreased with La3+ substitution. The values of the tangent loss were in the appropriate range for electromagnetic shielding applications.

DOI

10.3390/engproc2023055094

Publication Date

1-1-2024

Recommended Citation

Subramanyam, Gowravi; Rao, Nishkala Kadambu; and Daivajna, Mamatha Durgadas, "La³⁺-Induced Band-Gap Modifications in Barium Hexaferrite: An Investigation of the Structural, Optical, and Dielectric Properties †" (2024). Open Access archive. 10947.
https://impressions.manipal.edu/open-access-archive/10947