  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.
