A Bi-Mn based ceramic with tunable electrical properties for high temperature NTC-thermistor application

Nusrat ZAHAN; Praveen Priyaranjan NAYAK; Rashmi Rani PATRO; Siddharth SAHANY; Debasish PANDA; Om Prakash DAS; Sushansu Sekhar HOTA

doi:10.55713/jmmm.v37i1.2496

Authors

Nusrat ZAHAN Faculty of Engineering and Technology, SOA University, BBSR, India
Praveen Priyaranjan NAYAK Faculty of Engineering and Technology, SOA University, BBSR, India
Rashmi Rani PATRO Department of Computer Science & Information Technology (CSIT), GITA Autonomous College, BBSR, India
Siddharth SAHANY Faculty of Engineering and Technology, SOA University, BBSR, India
Debasish PANDA Department of Physics, SOA University, BBSR, India
Om Prakash DAS Faculty of Engineering and Technology, SOA University, BBSR, India
Sushansu Sekhar HOTA Department of Physics, SOA University, BBSR, India

DOI:

https://doi.org/10.55713/jmmm.v37i1.2496

Keywords:

BiMn2O5-Sillenite, Barium strontium titanate(Ba1-xSrxTiO3), Dielectric constant, electric properties, BST, High-T thermistor, Impedance

Abstract

This article presents detailed structural and electrical properties of BiMn₂O₅-Sillenite biphasic ceramic synthesized via solid state reaction technique. The weight percentage of BiMn₂O₅ and Bi₂₅Mn₂O₄₀ are found to be 90.121 ± 1.900 and 9.878 ± 0.022, respectively. The scanning electron microscope image of the composite material that reflects the presence of polycrystalline nature having the average grain size (G_avg) 1.22 µm. The topographic grain behaviour shows the presence of high intense grains nature of the material surface. We investigated relaxation processes, ionic hopping, transport mechanisms, and semiconducting properties by studying the dielectric, conductivity, modulus, and impedance spectra over a broad frequency range (1 kHz to 1 MHz) and temperatures from 25°C to 500°C. The thermistor constant (β) is 2053.8, and the temperature coefficient of resistance (TCR) is found to be ‒0.00253 which confirms the suitable NTC properties. The NTC behaviour confirms the material is very good candidate for high-T thermistor component.

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