Исследование пьезоэлектрического резонанса в стехиометрических кристаллах LiNbO-=SUB=-3-=/SUB=- в области высоких температур и проводимости

In order to establish conditions of lithium niobate based piezoelectric resonators application at high temperatures and high conductivity in a wide range of temperatures (~ 300 – 850К) we have researched piezoelectric, ferroelectric, dielectric properties and ion conductivity of near-stoichiometric LiNbO3stoich crystals. We have revealed that piezo-resonance is observed in LiNbO3stoich in a certain temperature range ΔТ (correspondingly, in certain static conductivity relaxation time Δtau_V range) and frequencies range Δomega_R provided that tau_V-1<<omegaR. Such patterns are probably applicable not only to LiNbO3stoich crystals, but also to other piezoelectric materials.

Динамическая проводимость графеносодержащего шунгита в диапазоне сверхвысоких частот

The conductivity of thin graphene-based shungite sheets has been experimentally investigated. Direct-current measurements have been performed upon reflection of microwaves. It is shown that, at a low carbon content, the dynamic conductivity of shungite is similar to its static conductivity and, at a high carbon content, exceeds the latter by more than an order of magnitude. The data obtained are interpreted using shungite structural components.

Dielectric spectra of ionic liquids and their conversion to solvation dynamics: a detailed computational analysis of polarizable systems

Using the reaction field continuum model the dielectric spectra of three selected ionic liquids were converted to the solvation dynamics of coumarin 153. It is shown in detail that the inclusion of the static conductivity in this model is essential.