Izoapsorpcijska i elektrićna istraživanja kristala Cu6PS5X (X=Br, I) oko feroelastičnog faznog prijelaza

Temperature dependence of positions of the absorption edge Eα g (α = 550 cm−1) of Cu6PS5X (X=Br, I) crystals in the temperature range 77 to 323 K are studied by isoabsorption measurements. Temperature variation of the total electric conductivity in the range of the second-order ferroelastic phase transition are analyzed.Istražujem temperaturnu ovisnost položaja apsorpcijskog ruba Eα g (α = 550 cm−1) kristala Cu6PS5X (X=Br, I) u području temperature 77 do 323 K izoapsorpcijskim mjerenjima. Analiziram temperaturne promjene ukupne električne vodljivosti u području feroelastičnog faznog prijelaza drugog reda

Izoapsorpcijska i elektrićna istraživanja kristala Cu6PS5X (X=Br, I) oko feroelastičnog faznog prijelaza

Temperature dependence of positions of the absorption edge Eα g (α = 550 cm−1) of Cu6PS5X (X=Br, I) crystals in the temperature range 77 to 323 K are studied by isoabsorption measurements. Temperature variation of the total electric conductivity in the range of the second-order ferroelastic phase transition are analyzed.Istražujem temperaturnu ovisnost položaja apsorpcijskog ruba Eα g (α = 550 cm−1) kristala Cu6PS5X (X=Br, I) u području temperature 77 do 323 K izoapsorpcijskim mjerenjima. Analiziram temperaturne promjene ukupne električne vodljivosti u području feroelastičnog faznog prijelaza drugog reda

Температурна залежність показника заломлення скловидних сплавів системи Ag – As −S

The temperature coefficient of refractive index dn/dT is determined for glassy allous of the system along the(Ag2S)x(As2S3)100-x, direction (0 < x <20) in the spectral interval of 1–5 μm at temperature of 77– 400 K theglasses in question are shown to take negative values of dn/dT depending on the composition and wavelength.The dependence of the coefficient on spectrum and temperature is studied using a single oscillator model.В спектральному інтервалі 1–5 мкм при температурах 77−400 К досліджено концентраційну поведінку температурного коефіцієнта показника заломлення dn/dT (ТКПЗ) скловидних сплавів системи Ag–As–S по розрізу (Ag2S)x·(As2S3)100-x,  х= 0−20 моль.%. В рамках одноосциляторної моделі проведений аналіз спектральної і температурної залежності даного  коефіцієнта

Saturation effect for dependence of the electrical conductivity of planar oriented nematic liquid crystal 6CB on the concentration of Cu7PS6 nanoparticles

The influence of Cu7PS6 nanoparticles with the average size 117 nm on the dielectric properties of planar oriented nematic liquid crystal 6CB has been investigated within the frequency range 10(1) ...10(6) Hz and at the temperature 293 K. It has been shown that when changing the concentration of nanoparticles within the range 0 to 1 wt.%, the conductivity of the liquid crystal changes stronger than its dielectric permittivity. It has been shown that the electrical conductivity increases monotonously with increasing the concentration of nanoparticles. However, for this dependence a saturation effect is observed. The mechanism of this effect was proposed.info:eu-repo/semantics/publishedVersio

Peculiarities of nonadditive changes in conductivity of nano-PDLC under influence of magnetite and single-wall carbon nanotubes

Studied in this work has been the effect of nanoparticles – magnetite and single-wall carbon nanotubes – separately and together on the conductivity of nematic liquid crystal 6CHBTdispersed in polyvinyl alcohol. Morphology of these films was analyzed using an electron microscope. When using selected technology of homogenizing the mixture components, there takes place formation of liquid crystals dispersed in the polymer matrix with the average sizes of liquid-crystal droplets close to 500 nm (nano-PDLC). It has been found that simultaneous introduction of magnetite and nanotubes results in lowering the conductivity of nano-PDLC as compared to the total conductivity of nano-PDLC with each kind of nanoparticles separately. It has been suggested that the main mechanism of this effect lies in formation of deep centers for electron capture by complexes with different types of nanoparticles, which leads to a decrease in electronic conductivity through the polymer matrix