Boron Enriched Unfired Phosphate Ceramics as Neutron Protector

Heat-resistant unfired phosphate ceramics with carbon nanotubes for electromagnetic application

“…To conclude, it is possible to fabricate thermally stable and mechanically robust material for different applications, e.g. for nuclear physics (phosphate filled with boron compounds for producing effective neutron shields or for collimation of slow neutrons), allowing at the same time to organize nondestructive control due to addition of small amounts of a third fraction, i.e., functional conductive filler, in particular multiwalled carbon nanotubes. In that case, it is reasonable to use MWCNTs with smaller mean outer diameters, as they provide (i) lower percolation threshold, at the level of 2 wt.%, and, simultaneously (ii) higher values of the ac conductivity, which means higher EMI shielding ability, if it is also required.…”

“…Among a variety of possibilities, phosphates, because of their advanced physical properties, first of all notable heat and fire resistance, are very interesting for different practical uses, e.g., as a matrix for fabrication of EM and/or ionizing radiation composite shields . Phosphate composites have been already widely applied for producing thermally stable materials, in particular, heat‐insulating and fire‐protective coatings, glues, heat‐resistant unfired ceramics, and paints .…”

“…A certain type of the developed phosphate composites has been used for the design of thermal insulation plates in the Energiya–Buran spacecraft . Filled with boron compounds, phosphate/boron composites were reported as effective materials for the absorption of slow neutrons and their collimation . In comparison with polymer matrices, the utilization of inorganic phosphate material as a host in composites allows many problems with substance affinity, filler dispersion and agglomeration to be avoided .…”

“…Filled with boron compounds, phosphate/boron composites were reported as effective materials for the absorption of slow neutrons and their collimation . In comparison with polymer matrices, the utilization of inorganic phosphate material as a host in composites allows many problems with substance affinity, filler dispersion and agglomeration to be avoided . Among others, the most topical issue is that the phosphate ceramics working temperatures can reach 1600–1700 °C, whereas the curing can be done at room temperature or maximum at 300 °C (for speeding‐up the synthesis).…”

Theoretical investigation of the vertical dielectric screening dependence on defects for few-layered van der Waals materials

“…Since the overall capacitance is inversely proportional to the eld intensity, as the frequency decreases, the eld intensity for a given voltage decreases, increasing the capacitance. 33 The phenomenon of atomic polarizability 34 of materials has been thoroughly studied and well established in terms of the Clausius-Mossotti relation,…”