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The MAS NMR study of solid solutions based on the YAG crystal

100%

Padlyak B. V., Sergeev N. A., Olszewski M., Stępień P.

issue 3

417-421

An 27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) study of nominally pure and Cr-doped yttrium-aluminum garnet (Y3Al5O12 and Y3Al5O12:Cr) crystals is reported. It has been shown that the doping by Cr of the Y3Al5O12 crystals leads to the variation of the occupation by Al atoms both octahedrally and tetrahedrally coordinated sites of the garnet lattice.

Influence of complexation on the composition of equilibrium phases in the system of Ce2(SO4)3-La2(SO4)3

88%

Milanova M., Todorovsky D., Balarew C., Minkova N., Ivanova K.

Open Chemistry

2007

vol. 5

issue 1

13-19

The cocrystallization of Ce2(SO4)3 and La2(SO4)3 is studied in aqueous and H2SO4 (150 g/dm3) solutions at 25 °C and 64 °C. The effect of the formation of inner sphere sulfate complexes of the type LnSO 4+ in determining the composition of the equilibrium phases is revealed. [...]

Study of solid-solution hardening in binary aluminium-based alloys

75%

Draissia M., Debili M.-Y.

Open Physics

2005

vol. 3

issue 3

395-408

Solid-solution formation in binary aluminium-based alloys is due essentially to the combined effects of the size and valence of solvent and solute atoms, as expected by the four Hume-Rothery rules. The lattice parameter of aluminium in the solid solution of the sputtered Al−Fe films is [Al-a (Å)=4.052−6.6×10−3Y]. The increasing and decreasing evolution of the lattice parameter of copper [Cu-a (Å)=3.612+1.8×10−3Z] and aluminium [Al-a (Å)=4.048−1.6×10−3X] in the sputtered Al-1.8 to 92.5 at. % Cu films is a result of the difference in size between the aluminium and copper atoms. The low solubility of copper in aluminium (<1.8 at % Cu) is due to the valences of solvent and solute atoms in contrast with other sputtered films prepared under similar conditions, such as Al−Mg (20 at. % Mg), Al−Ti (27 at. % Ti), Al−Cr (5at. % Cr) and Al−Fe (5.5 at. % Fe) where the solubility is due to the difference in size.

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1 Draissia M.

1 Ivanova K.

1 Milanova M.

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1 Padlyak B. V.

1 Sergeev N. A.

1 Stępień P.

1 Todorovsky D.

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The MAS NMR study of solid solutions based on the YAG crystal

Influence of complexation on the composition of equilibrium phases in the system of Ce2(SO4)3-La2(SO4)3

Study of solid-solution hardening in binary aluminium-based alloys