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Synthesis of lanthanum titanate (La2Ti2O7) for high temperature sensor applications

Abstract

Lanthanum titanate (La2Ti2O7) with perovskite-like layered structure is a candidate material for high temperature sensor application due to its high curie temperature (Tc = 1461 °C) and linearity of temperature vs. electrical resistance. La2Ti2O7 (LTO) was synthesized by solid state reaction using constituent powders at 1250 °C for 2 h. The LTO samples prepared in the form of circular pellets were sintered in temperature ranges (1350 to 1400 °C for 2 h). The sintered density was found highest at 1400 °C for LTO samples (> 97.24% Th.). Moreover, the sintered LTO samples were characterized for their ferroelectric properties as well as DC electrical resistivity (ρ) measured in the temperature range of 100 to 900 °C. The electrical resistivity was decreased from 1013 to 106 Ω cm linearly with the increase in temperature from 100 to 900 °C. Hence, LTO is a promising sensor material for high temperature applications.

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Acknowledgements

The authors would like to thank XRD and SEM group of MSD, CSIR-NAL for their immense support. The authors also thank GTMAP-AR&DB, India for the sanction of project (ARDB/GTMAP/01/2031818/M/I).

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Correspondence to P. K. Panda.

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Ansari, N.I., Sivagnanapalani, P., Sureshkumar, V. et al. Synthesis of lanthanum titanate (La2Ti2O7) for high temperature sensor applications. J Mater Sci: Mater Electron 32, 27422–27428 (2021). https://doi.org/10.1007/s10854-021-07117-5

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  • DOI: https://doi.org/10.1007/s10854-021-07117-5