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

• Published in: Journal of materials science. Materials in electronics 2021-12, Vol.32 (23), p.27422-27428
• Main Authors: Ansari, Naveed Iqbal, Sivagnanapalani, P., Sureshkumar, V., Shivaraj, B. W., Panda, P. K.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Curie temperature; Electrical resistivity; Ferroelectricity; High temperature; Iron constituents; Lanthanum; Materials Science; Materials selection; Optical and Electronic Materials; Perovskites; Sensors; Sintering (powder metallurgy); Temperature sensors
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-07117-5

Lanthanum titanate (La 2 Ti 2 O 7 ) with perovskite-like layered structure is a candidate material for high temperature sensor application due to its high curie temperature ( T c  = 1461 °C) and linearity of temperature vs. electrical resistance. La 2 Ti 2 O 7 (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 10 13 to 10 6 Ω cm linearly with the increase in temperature from 100 to 900 °C. Hence, LTO is a promising sensor material for high temperature applications.