Dynamic electrophysical characterization of rubidium polytungstate ceramics under fast humidity impact

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The electrophysical reaction of rubidium polytungstate Rb4W11O35 ceramics (RPTC) on fast humidity impact has been investigated by studying the influence of wet air pulse of 1-3 s of duration on the peculiarities of dynamic current-voltage (I-V-) and charge-voltage (Q-V-) loops and transient current-time (I-t-) curves. The revealed peculiarities of I-V- and Q-V-loops and I-t-curves for RPTC subjected to humidity impact were compared with similar ones observed for water damaged hydrogen-bounded ferroelectric triglicyne sulphate (TGS) crystals. The obtained data indicate at least two possible scenarios of polar reaction on the humidity impact, namely protonic/ionic space charge transfer and ferroelectric-like reversible polarization in surface conglomerate of RPTC disturbed by dipolar H2O adsorbate. Due to a high surface activity the RPTC can be considered as promising materials for creating humidity sensitive elements of environment monitoring systems. Direct humidity-to-frequency (time) conversion was realized by inserting metal-RPTC-metal humidity sensitive element in LC resonance or RC-relaxation frequency control circuits of generating units.