Abstract
Abstract Humidity sensitivity of Mg 1− x Li x Fe 2 O 4 (0.0 ≤ x ≤ 0.6) samples prepared by solid-state reaction of inorganic precursors has been studied. Specimens prepared by this method were confirmed to exhibit spinel structure by X-ray diffraction studies and FT-IR spectral absorption peaks observed in mid IR spectroscopic analysis at υ 1 = 580–600 cm −1 and υ 2 = 400–436 cm −1 . Distribution of nano-size grains was observed by scanning electron micrographs. It was observed that the grain size further decreased from 200 nm to 110 nm with substitution of lithium ions. The sensitivity factor increased from 165 for pure magnesium ferrite to 2080 for lithium substitution in the range 10–80% RH. The shortest response time was measured to be 180 s for the x = 0.4 composition sample.
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