Fig. 6. Relative humidity dependence of Cp at 25 °C and several frequencies for (a) 1% Sn-NTO and (b) 5% Sn-NTO; their insets show the ΔCp (%). (c) Comparison of Cp-humidity sensitivity of Sn-NTO with (In + Nb) and (Na + Nb) co-doped TiO2 ceramics.
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