Kinetic models for sensory response of multicomponent oxide nanomaterials with a hierarchical pore system

A kinetic model for sensory response of multicomponent oxide nanomaterials used as sensing elements of gas sensors and vacuum gauges is proposed. It is shown that gas-sensitive properties of nanomaterials depend both on their qualitative and quantitative composition, and morphostructure to determine the presence of a hierarchical pore system therein.

PROPERTIES SYSTEMATIZATION FOR POLAR OXIDE CRYSTALS

The systematization of piezoelectic (PE), pyroelectric (PYE), electrooptic (EO), and nonlinear optical (NLO) properties has been carried out for the polar oxide crystals, used in functional electronics. The sharp extremal dependence has been found for the upper envelope of fuzzy sets for these properties taken in pairs. There is no any theoretical analysis of such dependencies in solid state physics up to now. It is shown nevertheless, that general view of such interrelationships is different in detail. The experimental points are near the upper envelope for the NLO-PE interrelationship, but there is still a lack of empirical data for EO-PE interrelationship. The highest acentric properties are observed in crystals of multicomponent oxide relaxors, partially studied only in the last 20 years.

Optimization of 3D Inlay Mode of “Z-Pins Like” V0.9-Si0.1 Rods and Their Improvement Effect on the Anti-Ablative Performance of C/C-ZrC-SiC

Neoteric “Z-pins like” vanadium0.9-silicon0.1 rods (V0.9-Si0.1 rods) as polybasic multiphase oxide compensators were prepared to improve the anti-ablation of C/C-ZrC-SiC over 2500 °C. The microstructure and improvement effect on the anti-ablation of different C/C-ZrC-SiC surface were investigated. Results show that the density of “Z-pins like” V0.9-Si0.1 rod was effectively improved after adding Si. When ablation time was less than 180 s, “Z-pins like” V0.9-Si0.1 rods perpendicular to non-woven cloth layer presented the best improvement of the anti-ablation performance by liquid/gaseous multicomponent oxide compensation. However, when ablation time was greater than 180 s, “Z-pins like” V0.9-Si0.1 rods perpendicular to non-woven cloth layer increased another harm that weaken the anti-ablative performance of C/C-ZrC-SiC, namely, the corrosion damage of oxide layer on the matrix surface caused by excessive oxide melt. Therefore, there is a best improvement of the anti-ablation performance of “Z-pins like” V0.9-Si0.1 rods parallel to non-woven cloth layer.

PHYSICO-CHEMICAL ASPECTS OF USING REE-CONTAINING NÌTRATE SYSTEMS IN FORMING MULTICOMPONENT OXIDE FUNCTIONAL MATERIALS

For obtaining the nanosized inorganic materials on oxides of transition and rare earth elements, the most promising is the use of methods of "soft chemistry" based on synthesis from aqueous or non-aqueous solutions at relatively low temperatures. Their key advantages are: the possibility of obtaining products with controlled composition and micromorphology, efficiency, environmental acceptance and so on.