Temat: 81.70.Pg - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Kinetics of Spinel Formation of Algerian Halloysite by Differential Thermal Analysis
Autorzy:: Heraiz, M.
Sahnoune, F.
Belhouchet, H.
Raghdi, A.
Ouali, A.
Powiązania:: https://bibliotekanauki.pl/articles/1033398.pdf
Data publikacji:: 2017-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.70.Pg
81.20.Ev
82.20.-w
Opis:: The kinetics of spinel (Al-Si) crystallization from Algerian halloysite (DD1) was investigated using differential thermal analysis. Experiments were carried out on samples between room temperature and 1400°C with constant heating rate from 2 to 20°C min¯¹. The activation energies measured from isothermal and non-isothermal treatments were 1054.85 and 1140 kJ mol¯¹, respectively, for the spinel (Al-Si) formation. The Avrami constant n obtained by the Ligero method and the m parameter obtained by the Matusita method were about 2 for spinel crystallization. This value indicates that the crystallization mechanism of Al-Si spinel phase proceeds by bulk nucleation of the phase formation with a constant number of nuclei and that the three-dimensional growth of crystals is controlled by diffusion.
Źródło:: Acta Physica Polonica A; 2017, 131, 1; 139-142
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Study on Preparation and First-Stage Sintering Kinetics of ThO₂-UO₂ Pellets Made by Sol-Gel Microspheres Technique
Autorzy:: Sökücü, A.
Bedir, M.
Aybers, M.
Powiązania:: https://bibliotekanauki.pl/articles/1401228.pdf
Data publikacji:: 2015-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 82.20.Pm
81.20.Fw
81.20.Ev
81.70.Pg
Opis:: The sol-gel method, which is among the methods used for the production of ThO₂-UO₂ mixed oxide fuel pellets, allows a high degree of micro-homogeneity of uranium and thorium in the solution stage. The present study seeks to develop an alternative method in order to produce mixed thorium-uranium dioxide fuel pellets, prepared by internal gelation technique of sol-gel process. The study also aims to investigate shrinkage behavior and first-stage sintering kinetics of pellets compacted in the Ar-5%H₂ atmosphere using a dilatometer. The chemical and physical properties such as density, homogeneity, O/M ratio, metallic impurities, unit cell parameters, phase contents and surface area of powders, that have different compositions of thoria-urania, were studied. The influences of sintering parameters on the characteristics of microspheres and on the properties of sintered pellets are discussed.
Źródło:: Acta Physica Polonica A; 2015, 127, 4; 987-991
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Effect of CaO Addition on the Sintering Behaviour of Anorthite Formed from Kaolin and CaO
Autorzy:: Ouali, A.
Sahnoune, F.
Belhouchet, H.
Heraiz, M.
Powiązania:: https://bibliotekanauki.pl/articles/1032557.pdf
Data publikacji:: 2017-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Je
81.05.Mh
81.20.Ev
81.70.Pg
65.40.De
65.60.+a
Opis:: Thermal reactions and sintering behavior of kaolin DD3 (Djebel Debbagh, Algeria) and CaO mixtures to obtain dense anorthite ceramics were investigated. Mixed powders were uniaxially pressed and fired between 850 and 1150°C. Firing the pressed specimens yielded a dense anorthite ceramics. The sintered density increased with increase of CaO content and reached the maximum value of 2.57 g/cm³ for the composition containing 10 wt% CaO and fired at 1150°C. Their coefficient of linear expansion of the sintered samples at 1100°C decreases with the addition of CaO. X-ray diffraction experiments carried out on the samples containing varied amount of CaO and fired at the temperatures higher than 1000°C for 2 h showed the presence of only anorthite phase.
Źródło:: Acta Physica Polonica A; 2017, 131, 1; 159-161
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Influence of spark plasma sintering on microstructure and properties of bulk LaCaSrMnO magnetocaloric materials
Autorzy:: Zmorayová, K.
Antal, V.
Kováč, J.
Diko, P.
Noudem, J.
Powiązania:: https://bibliotekanauki.pl/articles/1053176.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.47.Lx
61.72.-y
75.30.Kz
77.80.B-
81.70.Pg
81.20.Ev
81.30.Fb
Opis:: Polycrystalline La_{0.67}Ca_{0.33-x}Sr_xMnO₃ (x=0.33, 0.03, 0) (LCSM) perovskite samples treated by spark plasma sintering technique were investigated. This study proved influence of the sintering temperature on microstructure of these perovskite ceramics. The thermogravimetric measurements revealed the possibility of increase of oxygen content in studied LCSM samples by additional annealing under oxygen atmosphere and low temperature. Finally, the effect of this annealing on magnetic properties was demonstrated.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 804-806
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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