Electrical properties of the potassium polytitanate compacts

Data on electrical properties of nickel modified potassium polytitanates compacted powders

“…By extrapolating it to the frequency 10 −2 Hz one might assess dc conductivity, σ dc , in dependence on composition of particular compact before or after the thermal treatment. Compacts before the thermal treatment (containing physically adsorbed water) show dc-conductivity similar to the one for the parent PPT (~5·10 –9 Sm/cm) [5] . However, compacts modified at pH=6.5 show lower conductivity σ dc ~10 –9 Sm/cm.…”

Dielectric properties of the polymer–matrix composites based on the system of Co-modified potassium titanate–polytetrafluorethylene

“…The values of permittivity for pure PTFE as well as the composites with 1 and 5 wt% of the filler have a very weak dependence on frequency in the range of 10 −2 –10 6 Hz, whereas the composites containing 20, 40, and 50 wt% of the ceramic filler only are characterized with stable values of ɛ in the range of 10 2 –10 6 Hz. Further decreasing of the frequency promotes significant increase in the dielectric constant, which is typical for the CNC filler 12–14 and caused by growth of the interfacial polarization on the border between electrode and solid state electrolyte. 20,34

Figure 6.Frequency dependence of permittivity, ɛ (a); conductivity, σ (b), and dielectric losses, tan δ (c), for pure PTFE (1) and CNC–PTFE composites characterized with different CNC contents: 1 wt% (1), 5 wt% (2), 20 wt% (3), 40 wt% (4), 50 wt% (5).

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“…It is important that, during the thermal treatment, the amorphous particles of modified potassium polytitanates have a tendency to form multiphase and heterostructured products characterized with increased polarizability and adhesion properties. 13,15 Furthermore, the cost of powdered PPT is significantly lower than that of the nanoscale BaTiO 3 powders of high purity, traditionally used in the manufacture of the ferroelectric materials (8–10 and 20–40 USD per kg, respectively). That is why, they have been considered as the promising materials to improve the dielectric properties of PTFE.…”

“…In our previous studies, it was shown that potassium polytitanates (PPT), modified by d-metal (Me) containing salts and further calcined at high temperatures (700-950 C) allowed obtaining the ceramic composites characterized with high permittivity (up to 100) at high frequency (microwave) range, [13][14][15][16] which does not concede BaTiO 3 dielectric constant. It is important that, during the thermal treatment, the amorphous particles of modified potassium polytitanates have a tendency to form multiphase and heterostructured products characterized with increased polarizability and adhesion properties.…”

Data on energy-band-gap characteristics of composite nanoparticles obtained by modification of the amorphous potassium polytitanate in aqueous solutions of transition metal salts

“…The TiO 2 :K 2 O molar ratio of the powder corresponded to 4.05:1.00. The PPT powder was modified according to the following route [5] , [6] , [7] : 15 g of powder was put in a glass which then was filled with 100 ml of 10 −3 M aqueous solution of the corresponding transition metal salts. The obtained suspension was stirred for 8 h and then the obtained product was separated by centrifugation and dried at 60 °C for 4 h. The chemical composition of the prepared powders was determined in the oxide form using an energy-dispersive X-ray fluorescence spectrometer and reported in Table 1 .…”