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    Wyświetlanie 1-8 z 8
    Tytuł:
    Synthesizing of (Bi₂O₃)_{1-x-y}(Ho₂O₃)_x(Dy₂O₃)_y Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cells
    Autorzy:
    Kaşikci Özen, M.
    Kayali, R.
    Çiçek Bezir, N.
    Evcin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398679.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Ed
    Opis:
    In present study, Ho₂O₃ and Dy₂O₃ doped Bi₂O₃ composite materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs) were investigated. $(Bi_2 O_3)_{1-x-y}(Ho_2 O_3)_x(Dy_2 O_3)_y$ ternary systems (x=0.11, 0.13, 0.15 and y=0.01, 0.03, 0.05, 0.07) were fabricated using conventional solid-state synthesis techniques. The samples were characterized by means of X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, differential thermal analysis/thermal gravimeter, and the four-point probe technique. X-ray powder diffraction measurements indicated that all samples have the stable fluorite type face centered cubic (fcc) δ-Bi₂O₃ phase. Scanning electron microscopy micrographs of all of the samples showed that grain size distribution was uniform. Four-point probe technique measurements showed that the conductivity of the samples increase with increase of temperature. Additionally, it has been found that the maximum conductivity values of all samples fall in a range $8.44×10^{-2}-4.60×10^{-1} Scm^{-1}$ and their conductivity values corresponding to the intermediate-temperature region vary in the range $1.65×10^{-3}-2.30×10^{-1} Scm^{-1}$. The activation energy values of the samples were calculated from łogσ graphics versus 1000/T using the Arrhenius equation. It was found that there is a good agreement between the activation energy values and conductivity values.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 125-132
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study of Sb₂O₃ (Sb₂O₅) and Ta₂O₅ doping effects with TeO₂ on electrical properties of δ-Bi₂O₃
    Autorzy:
    Loubbidi, L.
    Chagraoui, A.
    Villain, S.
    Bourja, L.
    Orayech, B.
    Ait Sidi Ahmed, O.
    Moussaoui, A.
    Tairi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1154652.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    82.47.Ed
    Opis:
    In this study, Sb₂O₃ (Sb₂O₅) and Ta₂O₅ are used as co-dopants with TeO₂ to stabilize the delta phase of bismuth oxide (δ -Bi₂O₃). Some compositions with formula (1-x) BiO_{1.5}-(x/4) Sb₂Te₂O₉ and (1-x) BiO_{1.5}-(x/4) Ta₂Te₂O₉ (x=0.1, 0.2, 0.3, 0.6, and 0.9) have been synthesized by solid state reaction at 850°C and characterized by powder X-ray diffraction. The Bi_{0.9}Sb_{0.05}Te_{0.05}O_{1.575}, Bi_{0.9}Ta_{0.05}Te_{0.05}O_{1.575} and Bi_{0.8}Ta_{0.1}Te_{0.1}O_{1.65} retain a cubic fluorite structure of δ -Bi₂O₃ phase. The electric properties were studied by impedance spectroscopy. All samples were evaluated by calculating conductivities and activation energies. Various impedance model including constant phase element and the Warburg impedances have been used to interpret the Nyquist representations of electrical analyses.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 862-865
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Conductivity of Boron Oxide-Doped Yttria-Stabilized Cubic Zirconia (8YSZ)
    Autorzy:
    Aktas, B.
    Tekeli, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401428.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.20.Ev
    82.47.Ed
    Opis:
    The effect of B₂O₃ addition on the electrical conductivity of 8 mol% yttria-stabilized cubic zirconia (8YSZ) was investigated by analyzing the impedance spectra of 0-10 wt.% B₂O₃-doped 8YSZ powders prepared via a colloidal process. The doped powders were then pelletized under a pressure of 200 MPa, and then sintered at 1400°C for 10 h. Measurements of the electrical conductivity of the sintered specimens within a frequency range of 100 mHz-13 MHz, and temperature range of 300-800°C, revealed an increase in conductivity with increasing temperature. Furthermore, the grain interior, grain boundary and total conductivity of 8YSZ were found to be enhanced by the addition of 1 wt.% B₂O₃. This is attributed to the lattice distortion created by the addition of $B^{3+}$ cations to the 8YSZ lattice, which leads to an increase in the concentration of oxygen vacancies, thus ultimately resulting in an enhanced electrical conductivity.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1380-1383
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Borosilicate Addition on Mechanical Properties and Sinterability of 8YSZ
    Autorzy:
    Aktas, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186987.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.40.Np
    82.47.Ed
    Opis:
    The influence of borosilicate (BS) addition on the mechanical properties and sinterability of yttria-stabilized zirconia (8YSZ) was investigated using scanning electron microscopy (SEM) and Vickers-hardness test. Undoped and 0.5-10 wt.% BS-doped 8YSZ powders were prepared using a colloidal process. The powders were then pelletized under a pressure of 200 MPa. The BS-doped 8YSZ specimens were sintered at 1200-1400°C for 1 h. SEM results showed that intergranular glass phases were formed at the grain boundaries of 8YSZ, particularly in the 5 and 10 wt.% BS-doped 8YSZ specimens. These intergranular glass phases caused a decrease in grain size of 8YSZ. The grain sizes of the undoped and 0.5 wt% BS-doped 8YSZ specimens were 2.68 μm and 1.83 μm, respectively. The addition of BS to 8YSZ caused a decrease in the relative density. In addition, the relative density was found to be increased with higher sintering temperature. The hardness of 8YSZ decreased with the increase in BS dopant amount, due to presence at the grain boundaries of a BS glassy phase that has a lower hardness than 8YSZ.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 677-679
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical Interaction between Perovskite $La_{0.6}Sr_{0.4}FeO_3$ and Super-Ionic $Zr_{0.84}Y_{0.16}O_x$
    Autorzy:
    Gazda, M.
    Kusz, B.
    Płończak, P.
    Molin, S.
    Jasinski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812289.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    81.15.-z
    82.47.Ed
    Opis:
    Perovskites are materials of very versatile properties. They may be used in various ways and structures. In this work the results of investigation of the $Zr_{0.84}Y_{0.16}O_x$ electrolyte on $La_{0.6}Sr_{0.4}FeO_3$ perovskite support are presented. The perovskite support was fabricated by iso-axially die-pressing of $La_{0.6}Sr_{0.4}FeO_3$ powders and sintering at 1150°C. The $Zr_{0.84}Y_{0.16}O_x$ layer was deposited on $La_{0.6}Sr_{0.4}FeO_3$ by a combination of colloidal suspension and polymer precursor methods. In this way the dense electrolyte layer was prepared at as low temperature as 400°C. This method may be also useful for high-$T_c$ superconductor layers deposition. The chemical interaction between the electrolyte layer and perovskite support was investigated by X-ray diffraction. It was shown that no reaction occurs between cathode and electrolyte until 900°C. Above 1200°C, parameters of the $La_{0.6}Sr_{0.4}FeO_3$ unit cell increase. It suggests that the reaction between $Zr_{0.84}Y_{0.16}O_x$ and $La_{0.6}Sr_{0.4}FeO_3$ is accompanied by substitutional changes in the $La_{0.6}Sr_{0.4}FeO_3$.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 135-141
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Co₃O₄ on the Fracture Toughness and Microstructure of Yttria-Stabilized Cubic Zirconia (8YSZ)
    Autorzy:
    Aktas, B.
    Tekeli, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401433.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.20.Ev
    81.40.Np
    82.47.Ed
    Opis:
    The effects of the addition of Co₃O₄ to yttria-stabilized zirconia (8YSZ) on fracture toughness and microstructure was investigated using micro-indentation and scanning electron microscopy (SEM). Undoped and 1-15 wt.% Co₃O₄-doped 8YSZ powders were prepared using a colloidal process and then pelletized under a pressure of 200 MPa. The 8YSZ specimens were sintered at 1400°C for 1 h. SEM results showed that Co₃O₄ precipitated as a secondary phase among the primary 8YSZ grains. Furthermore, because of the presence of Co₃O₄ secondary phases at the grain boundaries of 8YSZ, the grain sizes of the 8YSZ samples increased with the addition of 1-15 wt.% Co₃O₄. The fracture toughness values of the undoped and 1 wt.% Co₃O₄-doped 8YSZ were determined to be 1.64 and 2.86 MPa $m^{1//2}$, respectively, indicating the fracture toughness of 8YSZ increased in 1 wt.% Co₃O₄ addition. The fracture toughness of 8YSZ increased upon the addition of 1 wt.% Co₃O₄.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1384-1387
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Properties of Co-Doped Ceria Electrolyte $Ce_{0.8-x}Gd_{0.2}Sr_{x}O_{2-δ}$ (0.0 ≤ x ≤ 0.1)
    Autorzy:
    Ramesh, S.
    Vishnuvardhan Reddy, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808028.pdf
    Data publikacji:
    2009-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.De
    66.10.Ed
    81.20.Fw
    82.45.Gj
    82.47.Ed
    82.45.Xy
    Opis:
    Effects of strontium doping on electrical properties of gadolinium-doped ceria were investigated. The $Ce_{0.8-x}Gd_{0.2}Sr_{x}O_{2-δ}$ (0.0 ≤ x ≤ 0.1) compositions were prepared by sol-gel method and sintered at 1300°C for 8 h, the bulk densities were over 93% of theoretical density. These results were consistent with scanning electron microscope. The crystallite size of these materials was determined using the X-ray powder diffractometer and the sizes range from 19.4 nm to 24.4 nm. From the experimental results, it was observed that the composition $Ce_{0.8-x}Gd_{0.2}Sr_{x}O_{2-δ}$ (x=0.02) exhibits higher conductivity (23.6× $10^{-3}$ S $cm^{-1}$) and minimum activation energy (0.83 eV) at 700°C. This composition is thus a potential candidate for use as electrolyte applications in intermediate temperature solid oxide fuel cells.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 5; 909-913
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of Ceria Based Novel Anode Nanopowders Synthesized by Glycine-Nitrate Process
    Autorzy:
    Yıldız, Ö.
    Soydan, A.
    Ata, A.
    Tunaboylu, B.
    Akın, D.
    İpcizade, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399974.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Ed
    81.07.Wx
    81.20.Ka
    81.20.Ev
    81.05.Mh
    61.46.Df
    Opis:
    Novel anode nanopowder materials consisting of ceria-based components synthesized by glycine-nitrate process were investigated for solid oxide fuel cells. Glycine-nitrate process involves a self-combustion reaction at 220C of water-based nitrate and glycine solutions which subsequently can reach up to 1200°C. The resulting morphology, the size of particles and the formation of crystalline phases were characterized by differential scanning calorimetry, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, the Brunauer-Emmett-Teller method and Nanosizer. It was determined that dopants in ceria such as Co, Ni, Cu, V and Fe had significant effect on the morphology and size. The size distribution measured by Nanosizer was 50-600 nm, transmission electron microscopy, 5-200 nm and the Brunauer-Emmett-Teller method 100-120 nm and specific surface area of powders in the range 67.45-72.05 $m^2 g^{-1}$ as measured by the Brunauer-Emmett-Teller method. Particles were observed to have spherical structures for Cu and Fe doped powders and rod-shaped in a porous tuff microstructure for those doped with Co and Ni. Vanadium doping helped to decrease the porosity and initiated the process of spheroidization of particles.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 432-435
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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