Enhanced dielectric response and sensing performance of Bi2MnCoO6/BaTiO3 composites for temperature sensing application

• Published in: IEEE transactions on dielectrics and electrical insulation 2023-08, Vol.30 (4), p.1-1
• Main Authors: Mittal, Shivam Kumar, Yadav, Deepak, Saini, Sandeep, Yadav, K. L.
• Format: Article
• Language: English
• Subjects: Ambient temperature; Barium titanates; Capacitance; Capacitive temperature sensor; Ceramics; Composite materials; Curie temperature; Dielectric loss; Dielectric properties; dielectric spectroscopy; Dielectrics; diffuse phase transition; double perovskite oxide; electro-ceramics; Emission analysis; Ferroelectricity; Field emission microscopy; Food processing; Grain size; Linearity; Permittivity; Perovskites; Phase transitions; Photomicrographs; relaxor ferroelectric; Sensitivity; Sensors; Temperature distribution; Temperature measurement; Temperature sensors
• ISSN: 1070-9878; 1558-4135
• DOI: 10.1109/TDEI.2023.3262631

Dielectric ceramics are proven and promising candidates for capacitive temperature sensor application due to their great sensitivity and linearity over a defined temperature range. The sensor is appropriate for applications that require high accuracies in a narrow temperature range, such as biomedicine, food safety, and food processing. In this study, we have synthesized the composites (1-x)Bi 2 MnCoO 6 -(x)BaTiO 3 consisting of two individual phases where x = 0, 0.02, 0.06, and 0.10 were prepared by a solid-state reaction method. The surface morphology of (1-x)Bi 2 MnCoO 6 -(x)BaTiO 3 ceramics has been studied using FESEM micrographs and found enhancement in the average grain size with the addition of BaTiO 3 . The dielectric spectroscopy revealed that as the temperature increases, there is an increase in dielectric constant, and all the samples exhibit frequency-dependent relaxor ferroelectric behavior with a broad peak at curie temperature due to diffusive phase transition. There is also a significant increase in the dielectric constant and a decrease in the dielectric loss of (1-x)Bi 2 MnCoO 6 -(x)BaTiO 3 ceramics observed with an increase in BaTiO 3 concentration due to excellent dielectric properties of BaTiO 3 . As the capacitance is directly proportional to the material's dielectric constant, there is also an increase in the sensing property of the sensor. From the measured data, the sensitivity of (1-x)Bi 2 MnCoO 6 -(x)BaTiO 3 composites are 1.21 pF/°C, 3.01 pF/°C, 5.63 pF/°C, and 6.26 pF/°C. Among all the composites, the x = 0.10 composite shows the highest sensitivity and linear response in the desired ambient temperature range.