Abstract
Samarium titanate (Sm2Ti2O7) is a perovskite layered structure (PLS) material with high Curie temperature (TC ≥ 1247 °C). Sm2Ti2O7 (STO) powders were synthesized by solid state reaction method by calcining the constituent powders at 1100 °C for 2 h. The average crystallite size of calcined STO powder was measured to be 61 nm. Circular discs of STO samples were sintered between the temperature range 1250–1450 °C with a soaking time of 2 h and sintered density was highest (>96.35% Th.) for the samples sintered at 1450 °C. The direct current electrical resistivity linearly decreased from 1013 to 106 Ω.cm during its increase in temperature from 100 to 900 °C. The activation energy of the STO samples were 0.38 ± 0.01 eV (Ea1) and 1.77 ± 0.01 eV (Ea2) at temperature ranges 100 to 400 °C and 500 to 900 °C, respectively. Hence, samarium titanate is a promising sensor material for high-temperature applications.
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