Publications by authors named "K N Lapko"
Ceramic composites with nanoparticles are intensively investigated due to their unique thermal, mechanic and electromagnetic properties. In this work, dielectric properties of phosphate ceramics with round silver nanoparticles of various sizes were studied in the wide frequency range of 20 Hz-40 GHz for microwave shielding applications. The percolation threshold in ceramics is close to 30 wt.
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- Researchers created composite materials with high levels of a specific ferroelectric compound (0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3) mixed into phosphate-bonded ceramics under varying pressures.
- All samples displayed a consistent distribution of the active ferroelectric phase and maintained thermal stability up to 900 K.
- The study found that the density of these composites varies in a non-linear way with pressure, with increased density leading to higher dielectric permittivity and strong piezoelectric properties.
The composite material filled with nano-sized BaTiO3 and Fe3O4 was designed and studied. The aluminium phosphate ceramics was used as a matrix. The XRD analysis demonstrates only the crystalline structure of the fillers used.
View Article and Find Full Text PDFIn situ formation of layered double hydroxides (LDH) on metallic surfaces has recently been considered a promising approach for protective conversion surface treatments for Al and Mg alloys. In the case of Mg-based substrates, the formation of LDH on the metal surface is normally performed in autoclave at high temperature (between 130 and 170 °C) and elevated pressure conditions. This hampers the industrial application of MgAl LDH to magnesium substrates.
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