Lidjici, H. Rguiti, M. Hobar, F. Trelcat, J. Courtois, C. Leriche, A.
Published in
Materials Science-Poland
The 0.935(Bi0.5Na0.5) TiO3 -0.065BaTiO3 (abbreviated as BNT6.5BT) lead-free ceramics were prepared by conventional solid state sintering technique. The effects of sintering temperature (1150–1200 °C) and poling condition on its piezoelectric properties were examined. Piezoelectric properties like the piezoelectric constant (d33) and electromechanic...
Sobiestianskas, R. Vengalis, B. Banys, J. Devenson, J. Oginskis, A. Lisauskas, V. Dapkus, L.
Published in
Materials Science-Poland
Nondoped BiFeO3 (BFO) and doped Bi0.9La0.1Fe0.9Mn0.1O3 (BLFMO) thin films (d = 200–350 nm) were grown at 650–750 °C by RF sputtering on Si and SrTiO3(100), coated by conductive LaNiO3 films and La2/3Ca1/3MnO3/SrRuO3 bilayers. The complex dielectric permittivity of the films was measured at room temperature in the frequency range from 10 MHz to 10 G...
Łoś, Przemysław Łukomska, Aneta Kowalska, Sylwia Jeziórska, Regina Zaprzalski, Przemysław Krupka, Jerzy
Published in
Materials Science-Poland
In the present paper a novel group of electromagnetic metamaterials as well as the method of their fabrication is presented. The studied metamaterials are polymer composites and nanocomposites made of polymer matrix/host (ethylene-vinyl acetate (EVA), polyethylene, polypropylene etc.) filled with copper flakes, of micrometer and/or nanometer size, ...
Ovchar, O. Durylin, D. Belous, A. Jancar, B. Kolodiazhnyi,
Published in
Materials Science-Poland
Slight A-site deficiency in ordered perovskites Ba(M2+ 1/3Nb2/3)O3(M - Co, Zn, Mg) is shown to promote the formation of single-phase dense ceramics, in which the microwave (MW) quality factor Q attains its maximum values. Any further decrease in the Ba concentration in Ba(M2+ 1/3Nb2/3)O3 always results in the formation of a multiphase material cont...
Cao, Lifeng Li, Lingxia Zhang, Ping Wang, Hongru
Published in
Materials Science-Poland
The structure and dielectric properties of perovskite Ag(Nb0.8Ta0.2)O3 ceramics were explored. A small amount of Bi2O3 was used to modify the dielectric properties of the ceramics. The addition of Bi2O3 led the ceramics to a high densification and optimal dielectric properties. With the addition of 4.5 wt% Bi2O3, the permittivity of Ag(Nb0.8Ta0.2)O...
Belous, A. Ovchar, O.
Published in
Materials Science-Poland
Several types of multiphase ceramic materials with excellent microwave (MW) dielectric properties have been considered. Studied materials were based on complex niobates and titanates with various crystal structures in which very high values of the MW quality factors (Q) can be attained. Slight compositional changes in the complex oxide systems have...
Sonoda, Kensaku Moriya, Yasuo Jantunen, Heli
Published in
Materials Science-Poland
Dielectric property of Cu/polymer thermoplastic composites was measured in high frequencies up to 1 GHz. Generally relative permittivity and dielectric loss of the composites increased as the increasing metal inclusion loading as the percolation theory predicts. The incorporation of the copper inclusion with surface antirust layer raised relative p...
Yönetken, Ahmet Çakmakkaya, Mehmet Erol, Ayhan Talaş, Şükrü
Published in
Materials Science-Poland
In this study, a composite containing WC (Tungsten Carbide) and Ni was produced by two different processing routes. Electroless Ni coated WC powders were consolidated and sintered at 1200 °C. Diffusion bonding couples of WC(Ni)-electrolytic Cu, WC(Ni)-AISI 316 stainless steel and WC(Ni)-WC(Ni) were manufactured by using a preloaded compression syst...
Gelczuk, Łukasz Dąbrowska-szata, Maria Synowiec, Zdzisław
Published in
Materials Science-Poland
The electrical properties of deep-level defects in real packaged SiC Schottky barrier rectifiers were studied by deep level transient spectroscopy (DLTS). One deep-level trap with an activation energy in the 0.29–0.30 eV range was revealed to be present in all the tested samples. The electrical characteristics of the trap indicate it is probably at...
Hsi, Chi-Shiung Chen, Mei Jantunen, Heli Hsu, Fang-Chi Lin, Tzu-Chin
Published in
Materials Science-Poland
The effect of LiF and CBS glass additives on the microstructure and dielectric property of BaTiO3 (BT) ceramics was studied. The phase of BaLiF3 was observed from the interaction between BT and LiF when the samples were sintered at 900 °C for 1 h. Crystal grains with Ba and F in atomic ratios of 1:3 were observed from the SEM and TEM analysis of th...
