https://doi.org/10.1140/epjs/s11734-025-01675-z
Regular Article
Exploring the structural, microstructural, dielectric, electrical, and optical properties of lanthanum-modified Bi2FeMnO6 double perovskite for some device applications
1
Department of Chemistry, ITER, Siksha O Anusandhan Deemed to be University, 751030, Bhubaneswar, India
2
Department of Physics, ITER, Siksha O Anusandhan Deemed to be University, 751030, Bhubaneswar, India
a
pgrachary@soa.ac.in
b
santoshparida@soa.ac.in
Received:
23
October
2024
Accepted:
5
May
2025
Published online:
21
May
2025
In this paper, we report the synthesis (solid-state reaction) and characterizations of the Bi0.75La1.25FeMnO6 (BLFMO) double perovskite ceramic. The preliminary structural analysis suggested that the sample adopts a major phase of rhombohedral crystal structure with an average crystallite size of 44.5 nm. Microstructural properties were studied using scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The analysis of the above-mentioned characterizations reveals that well-grown grains are uniformly distributed and agglomeration ratio may be a possible reason for better physical properties. The impedance spectroscopy reveals the dielectric, impedance, modulus, and conductivity properties of the sample over a wide range of frequency (1 kHz to 1 MHz) and temperature (25–500 °C). The sample exhibits high dielectric constant, low loss, negative temperature coefficient of resistance (NTCR) behavior, non-Debye relaxation, and thermally activated conduction mechanism. Fourier transform infrared spectroscopy (FTIR) spectrum shows the vibrational modes of all the elements in the sample. The ultraviolet–visible spectrum gives the direct band-gap energy of 2.8 eV, which is suitable for optoelectronic device applications. In the low electric field region, the material exhibits ohmic behavior, while in the higher electric field region, the material follows a space charge-limited conduction (SCLC) mechanism. The resistance versus temperature curve shows the semiconducting nature and its potential application as a negative temperature coefficient (NTC) thermistor.
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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
