Nd2Ti2O7 (NTO) with high curie temperature (TC) for high temperature sensor applications

Abstract

Perovskite-like layered structured (PLS) materials with A2B2O7 structure are promising materials for high temperature applications because of their high curie temperatures. These materials show linearity in resistivity vs. temperature, therefore, are preferred for high temperature sensor applications. Neodymium titanate (Nd2Ti2O7) is one of the prominent PLS materials with high curie temperature (TC ≥ 1500 °C). Nd2Ti2O7 (NTO) was synthesized by mixed oxide route and the powder was calcined at 1250 °C for 2 h. NTO samples were sintered in the temperature range of 1325–1400 °C for 2 h. The sintered samples were characterized for dielectric constant (K), P-E hysteresis loop and DC electrical resistivity (ρ) from 100 to 900 °C. The sintered density was highest at 1375 °C for NTO samples (>94.85% Th.). DC resistivity was found to decrease linearly from 1014 to 106 Ω cm with the rise in temperature from 100 to 900 °C, therefore, confirming as a prospective high temperature sensor material.