Raman study of decomposition of Na-bearing carbonates in water fluid at high P-T parameters.

The study of Na-carbonates stability and their transformations in aqueous carbonate fluid under high P-T conditions is relevant from the point of view of the understanding geochemical processes of the Na-assisted carbon circulation in the Earth's crust and subduction zones. In situ Raman study of Na-bearing carbonate-water-Fe-metal system in diamond anvil cell (DAC) at high P-T conditions revealed that carbonates decompose with abiogenic formation of formates and other organic compounds that differs from behavior of carbonates in dry system. XRD and FTIR methods have been used additionally to determine the phase composition.

Temperature phase transitions in silver niobate and lithium tantalate-modified silver niobate ceramics.

The temperature behaviour of 0.955 AgNbO-0.045 LiTaO and AgNbO ceramics was studied in the range from 10 to 415 K using Raman spectroscopy.

Enhancement of Thermoelectric Performance in BiSbTe Particulate Composites Including Ferroelectric BaTiO Nanodots.

An increasing number of studies have reported producing composite structures by combining thermoelectric and functional materials. However, combining energy filtering and ferroelectric polarization to enhance the dimensionless figure of merit thermoelectric remains elusive. Here we report a composite that contains nanostructured BaTiO embedded in a BiSbTe matrix.

The behavior of zeolites wairakite and phillipsite at high P-T parameters.

In situ investigation of mineral behavior in water medium at simultaneously high P-T parameters can be applied to modelling of mineral transformation processes in lithospheric plates. The behavior of zeolites wairakite and phillipsite under the P-T conditions of «cold» slab subduction, corresponding to the start of oceanic plate diving or ocean floor near geothermal sources, was studied by in situ Raman spectroscopy. During compression in water medium, phillipsite initial phase is stable up to T = 350 °C, P = 1.