The dispersion of permittivity and conductivity of crystals containing aqua complexes of different types ($\gamma$-HBO$_2$, Ca$_2$B$_6$O$_{11}\cdot{}$H$_2$O, La[B$_5$O$_8$](OH)$_2\cdot1.5$H$_2$O and TRB$_6$O$_9$(OH)$_3$ (TR - Tb, Tu)) is studied for the first time. The compounds were synthesized under hydrothermal conditions at T=270–280°C and P=70–100 atm. Depending on the contained aqua complex, the compounds display different temperature and frequency behavior of the electric properties. The measurements are carried out in the frequency range from $10^{-2}$ to 10$^6$ Hz and in the temperature range from −20 to 140°C.
Department of Physics of Polymers and Crystals, Department of Crystallography and Crystal Chemistry, and Department of General Physics and Wave Provesses; Faculty of Physics, Moscow State University, Leninskie gory, Moscow, 119992, Russia
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