Wyniki wyszukiwania - BazTech

1

Phase equilibria in the Gd-Cr-AI system at 500°C

Verbovytsky Y., Mika T., Kotur B.

Prace Naukowe. Chemia i Ochrona Środowiska / Akademia im. Jana Długosza w Częstochowie

|

2005

|

Vol. 10

91--97

EN

The phase equilibria at 500°C of the Gd-Cr-AI system have been investigated in the whole concentration region. Three ternary compounds were confirmed and their homogenity regions have been investigated. The crystal structure of all compounds have been refined by Rietveld profile analysis: GdCr23-20AI19.7-20.0 (CeCr2AI20 structure type, space group Fd3m, a=1.44718(3)-1.44822(4) nm), Gd6Cr4AI43 (Ho6Mo4AI43 structure type, space group P63/mcm, a=1.09126(14) nm, c=1.7749(3) nm), GdCr4.0-28AI8.0-92 (ThMn12 structure type, space group I4/mmm, a=0.89780(18)-0.90395(15) nm, c=0.51 332(9)-0.51 253(9) nm).

2

Temperatures changes of structure in Al87Ni8Y5 amorphous alloy.

Mudry S., Bednarska L., Kulyk Y., Kotur B., Kovbuz M., Hertsyk O.

Archives of Materials Science

|

2004

|

Vol. 25, nr 4

373-378

EN

The structure of Al87Ni8Y5 amorphous alloy has been studied by means of X-ray diffraction method at different temperatures. Scattered intensity of X-ray was used to calculate the structure factors and pair correlation functions. Analysis of these functions allowed to study these crystallization kinetics of Al87Ni8Y5 amorphous alloy.

3

Crystal Structure of the New Ternary Th2Ni17-Type Related Compounds in the R-Mn-Al Systems (R=Gd, Tb, Dy, Ho, Er)

Kotur B, Palasyuk A.M.

Polish Journal of Chemistry

|

2001

|

Vol. 75, nr 5

633--637

EN

New hexagonal ternary phases R2-yMnzMnxAl17-x have been obtained in the Mn-rich regions of the R-Mn-Al (R = Gd, Tb, Dy, Ho, Er) systems: Gd2-yMnxAl17-x (0_y_0.15, 13.0 _x_ 15.1); Tb2-yMnxAl17-x (0_ y_0.23, 13.2_x_15.2); Dy2-yMnxAl17-x (0_y<~0.2, 11.9_x _14.6); Ho2-yMnxAl17-x (0_y<~0.2, 11.5_x_14.2) and Er2-yMnzMnxAl17-x (0_y_0.27, 0_ z_0.54, 11.3_x_14.1). Th2Ni17-type of structure occurs in alloys with the content of R = 10.5 at.% (ideal R2X17 stoichiometry). When R < 10.5 at.%, two ways of structure constitution are possible: i) formation of the Th2Ni17- type structure with defective 2(b) atomic position (solid solution of subtraction); ii) formation of the Th2Ni17-related type structure with the substitution of part of R atoms by the Mn-Mn pairs (solid solution of multiple substitution).