Wyniki wyszukiwania - BazTech

1

Investigation of the Ho2X3-Cu2X-ZX2 (X = S, Se; Z = Si, Ge) Systems

Lychmanyuk O., Gulay L., Olekseyuk L., Stępień-Damm J., Daszkiewicz M., Pietraszko A.

Polish Journal of Chemistry

|

2007

|

Vol. 81, nr 3

353-357

EN

Phase equilibria in the Ho2X3-Cu2X-ZX2 (Z = Si, Ge; X = S, Se) systems at 870 K were determined using X-ray single crystal and powder diffraction. The existence of the HoCuS2, HoCu5 X4 compounds and the Ho(2+x)/3Cu2-xS2 (0 _ x _ 0.61), Ho(2+x)/3Cu2-xSe2 (0 _ x _ 1) solid solutionswas confirmed in theHo2X3-Cu2X (X=S, Se) systems. The Ho3Z1.25S7 compounds exist in the Ho2S3-ZS2 (Z = Si, Ge) systems. No compounds occur in the Ho2Se3-ZSe2 (Z = Si,Ge) systems. The formation of the Cu8ZX6, Cu4GeS4 and Cu2ZX3compounds was confirmed in the Cu2X-ZX2 (Z = Si,Ge;X= S, Se) systems. The formation of the Ho3CuZX7 (Z = Si, Ge; X = S, Se) compounds was observed in the Ho2X3-Cu2X-ZX2 systems.

2

Investigation of the Y2X3-Cu2X-SnX2 (X = S, Se) Systems

Shemet V., Gulay L., Stępień-Damm J., Pietraszko A., Olekseyuk L.

Polish Journal of Chemistry

|

2006

|

Vol. 80, nr 6

943-955

EN

The interactions between the components in theY2X3-Cu2X-SnX2 (X = S, Se) systems at 870 K were determined using X-ray powder diffraction. The existence of the compound YCuS2 and the Y(2+x)/3Cu2-xS2 (0 x 0.52) solid solution was confirmed in the Y2S3-Cu2S section. The existence of the solid solution Y(2+x)/3Cu2-xSe2 (0 x 1) was confirmed in the Y2Se3-Cu2Se section. No compounds were found in the Y2S3-SnS2 and Y2Se3-SnSe2 sections. The formation of the compounds Cu4SnS4, Cu2SnS3, Cu4Sn7S16 in the Cu2S-SnS2 system and the Cu2SnSe3 compound in the Cu2Se-SnSe2 system was confirmed. The formation of the Y3Cu1-4xSn1+xS7 (0 x 0.09) solid solution and the Y2Cu0.20Sn0.95S5 compound was determined in the Y2S3-Cu2S-SnS2 system. The existence of the compound Y3CuSnSe7 in the Y2Se3-Cu2Se-SnSe2 system was confirmed.

3

Crystal structure, thermal expansion, dielectric permittivity and phase transitions of Bi2S3

Łukaszewicz K., Stępień-Damm J., Pietraszko A., Kajokas A., Grigas J.

Polish Journal of Chemistry

|

1999

|

vol. 73 nr 3

541-546

EN

The crystal structure of Bi2S3 both natural (bismuthinite) and synthetic, reported in the literature, was determined at ambient temperature in the non-polar space group Pbnm. Physical properties of Bi2S3 indicate, however, on the possible phase transitions both in yhe high and low temperature regions. Precise lattice parameters measured as a function of temperature have shown weak anomalies at 160 and 410 K. The phase transition above 400 K has been also confirmed by measurements of microwave dielectric permittivity along the c-axis. The crystal structure of Bi2S3 has been determined at 130, 295 and 460 K. At all three temperature the crystal structure was successfully refined in the space group Pbnm. The weak phase transitions observed in Bi2S3 apparently do not change the symmetry, or these changes are too small to be deducted at the present level of accuracy of the X-ray crystal structure determination.

4

Interactions between the components in the Zr-Cu-In system at 870 K

Gulay L.D., Zaremba V.I., Kalychak Ya. M., Stępień-Damm J., Kobluck N.O.

Polish Journal of Chemistry

|

1998

|

Vol. 72, nr 3

511-513

EN

The interactions between components in Zr-Cu-In ternary system at 870 K have been studied by X-ray and microstructure analyses. One earlier known (ZrCu2In with MnCu2Al-type) and four inknown ternary compounds have been found. Crystal structure of all new compounds are determined: ZrCu5-xInx (x=0.3-1.3)-AuBe5 type of structure (space group F43m, a=6.955-7.042(2)A; ZrCuxIn3-x(x=0.35-0.80)-AuCu3 type of structure (space group Pm3m), a=4.3281-4.3079(1)A; Zr2Cu2In-Mo2FeB2type of structure (space group P4/mbm),a=7.194(2)A, c=3.410(4)A; Zr5CuIn3-Hf5CuSn3 structure type (space group P6(3)/mcm, a=8.671(2)A, c=5.917(1)A).

5

Interactions between the components in the Zr-Ag-In system at 870 K

Gulay L.D., Zaremba V.I., Stępień-Damm J., Kalychak Ya. M.

Polish Journal of Chemistry

|

1998

|

Vol. 72, nr 8

1886-1889

EN

The interactions between the components in the ternary Zr-Ag-In system were studied. An isothermal section at 870 K was established by X-ray analysis. Two unknown ternary compounds have been found: ZrAg-0.4In-2.6-AuCu3 structure type (space group Pm3m, a=4.3644(4) A and Zr5AgIn3-Hf5CuSn3 structure type (space group P6-3/mcm, a=8.735(3) A, c=5.948(2) A). Their crystal structures were determined by powder X-ray analysis.