scholarly journals Electrophysical Properties of Nanocomposites on the Basis of Polychlorotrifluoroethylene and Magnesium Oxide Modified with Copper Iodide

2016 ◽  
Vol 17 (4) ◽  
pp. 482-486 ◽  
Author(s):  
R.V. Mazurenko ◽  
P.P. Gorbik ◽  
G.M. Gunya ◽  
S.N. Makhno

Досліджено електрофізичні властивості в надвисокочастотному діапазоні та на низьких частотах композитів на основі хімічно модифікованого йодидом міді високодисперсного оксиду магнію та поліхлортрифторетилена в інтервалі температур 25 - 170оС і концентрацій CuI від 0 до 0,80 об’ємних часток. Встановлено оптимальний об’ємний вміст йодиду міді (~ 0,75) в композитах CuI/MgO, при якому міжфазна взаємодія проявляється найбільш інтенсивно, а електрофізичні параметри набувають максимальних значень. Показано, що полімерні композити, до складу яких входить CuI/MgO, мають вищі значення дійсної та уявної складових комплексної діелектричної проникності та електропровідності в порівнянні з системою, яка не містить модифіковані компоненти.

2017 ◽  
Vol 18 (2) ◽  
pp. 215-221
Author(s):  
R.V. Mazurenko ◽  
М.V. Abramov ◽  
S.М. Makhno ◽  
G.M. Gunya ◽  
P.P. Gorbik

The structural, magnetic and electrophysical properties of composites based on nanosized magnetite chemically modified of copper iodide and polychlortrifluoroethylene have been studied at temperatures 298 – 450 K and CuI concentrations of from 0 to 0,58 volume. It has been found the optimal volume content of copper iodide (~ 0.4) in the composites CuI/Fe3O4, when the interfacial interaction shows most intensively and maximum values electrical parameters take place. The value of the coercive force of nanocomposites CuI/Fe3O4 increases with increasing content copper iodide. It was shown that polymer composites containing CuI/Fe3O4, have higher values of real and imaginary components of complex permittivity and conductivity compared with a system that contains only copper iodide.


2020 ◽  
Vol 494 ◽  
pp. 165824 ◽  
Author(s):  
S.L. Prokopenko ◽  
R.V. Mazurenko ◽  
G.M. Gunja ◽  
N.V. Abramov ◽  
S.M. Makhno ◽  
...  

2019 ◽  
Vol 41 (3) ◽  
pp. 289-286
Author(s):  
R. V. Mazurenko ◽  
◽  
S. L. Prokopenko ◽  
O. I. Oranska ◽  
G. M. Gunya ◽  
...  

Author(s):  
P. L. Burnett ◽  
W. R. Mitchell ◽  
C. L. Houck

Natural Brucite (Mg(OH)2) decomposes on heating to form magnesium oxide (MgO) having its cubic ﹛110﹜ and ﹛111﹜ planes respectively parallel to the prism and basal planes of the hexagonal brucite lattice. Although the crystal-lographic relation between the parent brucite crystal and the resulting mag-nesium oxide crystallites is well known, the exact mechanism by which the reaction proceeds is still a matter of controversy. Goodman described the decomposition as an initial shrinkage in the brucite basal plane allowing magnesium ions to shift their original sites to the required magnesium oxide positions followed by a collapse of the planes along the original <0001> direction of the brucite crystal. He noted that the (110) diffraction spots of brucite immediately shifted to the positions required for the (220) reflections of magnesium oxide. Gordon observed separate diffraction spots for the (110) brucite and (220) magnesium oxide planes. The positions of the (110) and (100) brucite never changed but only diminished in intensity while the (220) planes of magnesium shifted from a value larger than the listed ASTM d spacing to the predicted value as the decomposition progressed.


Author(s):  
T. Kizuka ◽  
N. Tanaka

Structure and stability of atomic clusters have been studied by time-resolved high-resolution electron microscopy (TRHREM). Typical examples are observations of structural fluctuation in gold (Au) clusters supported on silicon oxide films, graphtized carbon films and magnesium oxide (MgO) films. All the observations have been performed on the clusters consisted of single metal element. Structural stability of ceramics clusters, such as metal-oxide, metal-nitride and metal-carbide clusters, has not been observed by TRHREM although the clusters show anomalous structural and functional properties concerning to solid state physics and materials science.In the present study, the behavior of ceramic, magnesium oxide (MgO) clusters is for the first time observed by TRHREM at 1/60 s time resolution and at atomic resolution down to 0.2 nm.MgO and gold were subsequently deposited on sodium chloride (001) substrates. The specimens, single crystalline MgO films on which Au particles were dispersed were separated in distilled water and observed by using a 200-kV high-resolution electron microscope (JEOL, JEM2010) equipped with a high sensitive TV camera and a video tape recorder system.


2008 ◽  
Author(s):  
Beihai Ma ◽  
U. (Balu). Balachandran ◽  
Rachel E. Koritala ◽  
Dean J. Miller
Keyword(s):  

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