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    Wyświetlanie 1-10 z 10
    Tytuł:
    Influence on Static Grain Growth and Sinterability of BaO Addition into 8YSZ
    Autorzy:
    Aktas, B.
    Tekeli, S.
    Salman, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311666.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.07.Bc
    81.20.Ev
    Opis:
    In this study, 8 mol.% yttria stabilized cubic zirconia (8YSZ) powders as a matrix material and 0-15 wt% BaO powders as an additive were used in order to determine the effect of BaO addition and amount on the microstructure, sintering and static grain growth properties of the 8YSZ. For these purposes, undoped and BaO-doped 8YSZ specimens were annealed for grain growth at 1400, 1500, and 1600C for 10, 50, and 100 h, respectively. An increase of annealing temperature and holding time resulted in grain growth in all specimens. The grain size of the 8YSZ decreased with the higher level of BaO added. A limited amount of BaO dissolved in 8YSZ, and insoluble BaO reacted with $ZrO_2$ at high sintering temperature and generated the $BaZrO_3$ second sphase compound. Energy dispersive X-ray spectroscopy results showed that the $BaZrO_3$ second phase segregated at the surrounding grains and grain boundaries of the 8YSZ. These $BaZrO_3$ second phases had a pinning effect at the grain boundaries and prevented the migration of the grain boundaries of the 8YSZ. In conclusion, the grain growth results showed that the grain growth in the BaO-doped 8YSZ specimens was controlled by a solid solution drag mechanism.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 652-655
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanochemical Preparation and Magnetic Properties of Fe₃O₄/ZnS Nanocomposite
    Autorzy:
    Bujňáková, Z.
    Zorkovská, A.
    Kováč, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032141.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    81.20.Ev
    81.20.Wk
    Opis:
    Powder nanocomposite of Fe₃O₄/ZnS was prepared by mechanochemical synthesis in a planetary ball mill. In this reaction natural magnetite mineral Fe₃O₄ was used, together with zinc acetate (CH₃COO)₂Zn·2H₂O and sodium sulfide Na₂S·9H₂O, as precursors for the zinc sulfide ZnS. X-ray diffraction revealed that the sample is composed of small nanocrystalline particles, containing Fe₃O₄ and ZnS. The non-milled magnetite showed distinctive Verwey transition at around 120 K, this becomes suppressed after milling, as a consequence of structural disorder and presence of defects. Moreover, the reduction of saturation magnetization from 91 A m²/kg to 69.2 A m²/kg was observed, as a consequence of the milling process. The magnetization of the Fe₃O₄/ZnS nanocomposite was the lowest (34.5 A m²/kg), due to the milling and to the decreased weight fraction of the ferrimagnetic component. Nevertheless, the Fe₃O₄/ZnS sample demonstrates ferrimagnetic behavior as well, and its structure is less perturbed by milling, the Verwey transition, although less impressive, but is preserved.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1120-1122
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure Studies on Mechanically Alloyed $Ni_{50}Ti_{50-x}Mo_{x}$ (x=10, 25, 40 at.%) Systems during Milling and after Annealing
    Autorzy:
    Panek, J.
    Karolus, M.
    Piasecki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398359.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    81.10.Jt
    81.20.Ev
    Opis:
    The subject of this study is the phase composition evolution of $Ni_{50}Ti_{50-x}Mo_x$ (x=10, 25, 40 at.%) systems prepared by mechanical alloying in as-milled state and after subsequent heat treatment. During milling a mechanically induced solid state reaction between nickel, titanium and molybdenum was observed leading to the formation of nanocrystalline disordered solid solutions. As a result of heat treatment a creation of NiMo intermetallic phase was observed as well as structure relaxation of previously formed solid solutions.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1066-1068
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Evolution of Tungsten-Based ODS Alloys Reinforced with the γ(Ni, Fe) Phase by a Secondary Ball Milling Method
    Autorzy:
    Chen, C.
    Zeng, Y.
    Lee, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375180.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ev
    81.20.Wk
    81.07.Bc
    81.05.Ni
    Opis:
    In the current study, $W-5Ni-2Fe-Y_2O_3$ model alloys were produced using a high-energy planetary ball mill. The presence of the γ(Ni, Fe) phase is favored with respect to material properties in this alloy. Therefore, a secondary ball milling method was introduced to obtain a fine and uniformly distributed γ(Ni, Fe) phase. Phase development of mechanical alloyed powders was investigated by X-ray diffraction. The results show that the formation of the γ(Ni, Fe) phase was found after 18 h of a pre-milling procedure. A further secondary milling method produced a uniform microstructure with grain refinement. TEM results also show changes in the lattice parameters of the tungsten and γ(Ni, Fe) phase associated with the solid solubility limits in the alloy produced by secondary ball milling.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 907-911
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Bismuth Ferrite Nanopowder Obtained by Mechanochemical Synthesis
    Autorzy:
    Szafraniak-Wiza, I.
    Andrzejewski, B.
    Hilczer, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375623.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    81.07.Wx
    81.20.Ev
    75.85.+t
    Opis:
    Multiferroic bismuth ferrite $(BiFeO_{3})$ nanopowders have been obtained at room temperature by mechanochemical synthesis. Depending on the post-synthesis processing the nanopowders exhibited differences in the mean sizes, presence of amorphous layer and/or secondary phases. Extended magnetic study performed for fresh, annealed and hot-pressed nanopowders revealed substantial improvement of the magnetic properties in the as-prepared powder.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 1029-1031
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Mechanical Alloying on the Microhardness and Fracture Toughness of $BaTiO_3$
    Autorzy:
    Ertuğ, B.
    Çetiner, B.
    Sadullahoğlu, G.
    Gökçe, H.
    Erkmen, Z.
    Öveçoğlu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399670.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    62.25.-g
    81.20.Ev
    62.20.mm
    Opis:
    In this work, the effects of mechanical alloying on the mechanical properties of $BaTiO_3$ were investigated. In order to examine the milling conditions and sintering parameters on the solid state formation of $BaTiO_3$, X-ray diffraction technique was used. After mechanical alloying process, nanosized powder mixtures were produced. Sintering temperatures were 600, 700, 800, 900, 1000, and 1200C and sintering duration was 1 h. Besides X-ray diffraction examinations, mechanical properties of the $BaTiO_3$ samples were determined by Vickers microhardness test.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 188-190
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Porosity Evaluation during ECAP in Aluminium PM Alloy
    Autorzy:
    Bidulská, J.
    Kvačkaj, T.
    Bidulský, R.
    Actis Grande, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418956.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.07.Bc
    81.20.Ev
    81.40.-z
    Opis:
    The main aim of this paper is to show porosity evolution during application of various processing conditions including pressing, sintering and equal channel angular pressure. An aluminium based powder (Al-Mg-Si-Cu-Fe) was used as investigated material. After applying different pressing pressures (400 and 600 MPa), specimens were dewaxed in a ventilated furnace at 400C for 60 min. Sintering was carried out in a vacuum furnace at 610C for 30 min. The specimens were processed by single equal channel angular pressure pass. A significant disadvantage of powder metallurgy processing methods is the presence of porosity. Pores act as crack initiators and, due to their presence, the distribution of stress is inhomogeneous across the cross-section and leads to reduction of the effective load bearing area. The equal channel angular pressure process, causing stress distribution in deformed specimens, made the powder particles to squeeze together to such an extent that the initially interconnected pores transform to small isolated pores. The proposed safety diagram includes the combined effect of stress and strain behaviour during equal channel angular pressure. The "safety line" eliminates and quantifies the effect of large pores as a potential fracture initiation sites with respect to the mechanical viewpoint.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 553-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Barium Titanate Ceramic Powders by Raman Spectroscopy
    Autorzy:
    Lazarević, Z.
    Romčević, N.
    Vijatović, M.
    Paunović, N.
    Romčević, M.
    Stojanović, B.
    Dohčević-Mitrović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808060.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.-s
    81.07.Bc
    81.20.Ev
    83.85.Hf
    Opis:
    Barium titanate, $BaTiO_3$ ceramic powders were prepared by mechanochemical synthesis and by the Pechini method. A powder mixture of BaO and $TiO_2$ was treated in a planetary ball mill in an air atmosphere for up to 1 h, using zirconium oxide vial and zirconium oxide balls as the milling medium. After 60 min $BaTiO_3$ phase was formed. In both ways $BaTiO_3$ ceramics were sintered after 2 h on 1300°C without pre-calcinations step. The heating rate was 10°C $\text{min}^{-1}$. The formation of phase and crystal structure of $BaTiO_3$ was approved by X-ray diffraction analysis and the Raman spectroscopy. The morphology and microstructure of obtained powders were examined by scanning electron microscopy method. Sharp phase transition from ferroelectric to paraelectric state was observed. The hysteresis loop is very well performed with regular sharp characteristic of ferroelectric materials.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 808-810
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of Carbon-Copper-Silicon Nanocomposite Materials and Coatings Owing to Abrasive-Reactive Wear
    Autorzy:
    Urakaev, F.
    Ketegenov, T.
    Borzdov, Y.
    Savchenko, I.
    Shevchenko, V.
    Stankus, S.
    Uvarov, N.
    Pokhilenko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538179.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ev
    81.40.Pq
    81.07.Wx
    81.07.Bc
    81.05.Mh
    Opis:
    We will focus on the important aspect of mechanical activation by grinding in a mill, namely, nanoscale wear of the treated substances and of the milling tools. A new technology called abrasive-reactive wear has been developed that utilizes wear debris as an integral component of the reaction system rather than treating it as a harmful impurity. This technology is applied to the processing of low-grade diamond and silicon by cupric milling tools. Abnormal influence of graphite on abrasive wear degree is established.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 873-877
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Conductivity of $(Bi_{1-x}La_{x}FeO_{3})_{0.5}(PbTiO_{3})_{0.5}$ Ceramics Obtained from Mechanosynthesized Nanopowders
    Autorzy:
    Markiewicz, E.
    Hilczer, B.
    Balcerzak, M.
    Jurczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375503.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    81.07.Wx
    81.20.Ev
    75.85.+t
    81.40.Rs
    Opis:
    Electric conductivity of $(Bi_{1-x}La_{x}FeO_{3})_{0.5}(PbTiO_{3})_{0.5}$ ceramics obtained from nanopowders synthesized by high-energy milling from respective oxides was studied in the frequency range 10 mHz ÷ 1 GHz. At room temperatures the low-frequency conductivity was found to be dominated by the contribution from poor-conducting grain boundaries, whereas the contribution in the range 1 kHz ÷ 1 MHz, due to the grain interior, was related by us to the small polaron hopping. Moreover, the electron exchange between ferric and ferrous ions activated at higher frequencies was found to be added to the conductivity above ≈ 1 MHz.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 971-974
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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