Work

Extended optical and dielectric properties of non-stoichiometric Mg0.5Ca0.5Fe2O4 nanoparticles

Year: 2025

Type: article

Abstract: This investigation reports UV–Vis–NIR absorption, impedance spectroscopy, and terahertz time-domain spectroscopic studies on Mg 0.5 Ca 0.5 Fe 2 O 4 nanoparticles. A direct allowed band gap of 1.67 ± 0.02 eV and Urbach energy of 0.566 ± 0.01 eV were obtained. THz-TDS revealed a nearly dispersion-free refractive index n ≈ 2.5 and a very low extinction coefficient (k = 0.02–0.07) while the part of permittivity remained remarkably stable (ε′ ≈ 5.9). Low-frequency dielectric dispersion (up to 1 MHz) followed Maxwell–Wagner interfacial polarization and Koop’s model. Combination of direct narrow band gap and record-low THz losses establishes non-stoichiometric Mg 0.5 Ca 0.5 Fe 2 O 4 NPs as a promising material for passive terahertz photonics and optoelectronic devices.

Source: Materials Today Communications

DOI: 10.1016/j.mtcomm.2025.114480

Authors: Sudeep Tiwari, Payal Deshmukh, Nilima Warade, P.B. Mane, Snehal Haldankar, Anol Mondal, Sudhish Kumar, Shriganesh Prabhu

Institutions: Tata Institute of Fundamental Research, Savitribai Phule Pune University, Mohanlal Sukhadia University

Language: English

Topic: Magnetic Properties and Synthesis of Ferrites

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,830

OpenAlex ID: W4417177649

FWCI: 0.212

Cites: 29

Cited by: 1

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