Phase equilibria in the Gd–Cr–Ge system at 1070 K

M. Konyk; L. Romaka; Yu. Stadnyk; V.V. Romaka; V. Pashkevych

doi:10.15330/pcss.22.2.248-254

Authors

M. Konyk Ivan Franko National University of Lviv
L. Romaka Ivan Franko National University of Lviv
Yu. Stadnyk Ivan Franko National University of Lviv
V.V. Romaka Institute for Solid State Research, IFW-Dresden
V. Pashkevych Lviv Polytechnic National University

DOI:

https://doi.org/10.15330/pcss.22.2.248-254

Keywords:

Intermetallics, Ternary system, Phase equilibria, Crystal structure

Abstract

The isothermal section of the phase diagram of the Gd–Cr–Ge ternary system was constructed at 1070 K over the whole concentration range using X-ray diffractometry, metallography and electron microprobe (EPM) analysis. Three ternary compounds are realized in the Gd–Cr–Ge system at the temperature of annealing: Gd₁₁₇Cr₅₂Ge₁₁₂ (Tb₁₁₇Fe₅₂Ge₁₁₂ structure type, space group Fm-3m, Pearson symbol cF1124, a = 2.8971(6) nm), GdCr₆Ge₆ (SmMn₆Sn₆structure type, space group P6/mmm, Pearson symbol hP16, a = 0.51797(2), c = 0.82901(4) nm) and GdCr_1-хGe₂ (CeNiSi₂ structure type, space group Cmcm, Pearson symbol oS16, a = 0.41569(1)-0.41593(8), b = 1.60895(6)-1.60738(3), c = 0.40318(1)-0.40305(8) nm). For the GdCr_1-xGe₂ compound the homogeneity range was determined (x=0.73 – 0,69).

References

M. Konyk, L. Romaka, L. Orovčik, V.V. Romaka, Yu. Stadnyk, Visnyk Lviv. Univ. Ser. Chem. 60(1), 38 (2019) https://doi.org/10.30970/vch.6001.038.

P.S. Salamakha, Y.M. Prots, J. Alloys Compd. 215, 51 (1994) https://doi.org/10.1016/0925-8388(94)90817-6.

M. Konyk, L. Romaka, Yu. Stadnyk, V.V. Romaka, R Serkiz, A. Horyn, Phys. Chem. Solid State 20(4), 376 (2019) https://doi.org/10.15330/pcss.20.4.376-383.

J.H.V.J. Brabers, K.H.J. Buschow, F.R. de Boer, J. Alloys Compd. 77, 205 (1994) https://doi.org/10.1016/0925-8388(94)90769-2.

P. Schobinger-Papamantelljsa, J. Rodriguez-Carvajalb, K.H.J. Buschow, J. Alloys Compd. 92, 256 (1997) https://doi.org/S0925-8388(96)03109-X.

F.M. Mulder, R.C. Thiel, J.H.V.J. Brabers, R.F. de Boer, K.H.J. Buschow, J. Alloys Compd. 198, L1 (1993) https://doi.org/10.1016/0925-8388(93)90130-F.

P. Schobinger-Papamantellos, J. Rodríguez-Carvajal, K.H.J. Buschow, J. Alloys Compd. 255, 67 (1997) https://doi.org/10.1016/S0925-8388(96)02872-1.

H. Bie, A. Tkachuk, A. Mar, J. Solid State Chemistry 182(1), 122 (2009) https://doi.org/10.1016/j.jssc.2008.10.013.

A. Gil, D. Kaczorowski, B. Penc, A. Hoser, A. Szytula, J. Solid State Chem. 184(2), 227 (2011) https://doi.org/10.1016/j.jssc.2010.10.026/.

O.I. Bodak, E.I. Gladyshevsky, Ternary systems containing rare earth metals (Vyshcha shkola, Lvov, 1985) (in Russian).

H. Bie, O.Ya. Zelinska, A.V. Tkachuk, A. Mar, J. Mater. Chem. 19(18), 4613 (2007) https://doi.org/10.1021/cm0727+.

A.V. Morozkin, Y.D. Seropegin, V.K. Portnov, I.A. Sviridov, A.V. Leonov, Mater. Res. Bull. 33, 903 (1998) https://doi.org/10.1016/S0025-5408(98)00051-8.

L. Akselrud, Yu. Grin, WinCSD: software package for crystallographic calculations (Version 4), J. Appl. Cryst. 47, 803 (2014) https://doi.org/10.1107/S1600576714001058.

J. Rodriguez-Carvajal, Recent developments of the program FullProf. Commission on Powder Diffraction, IUCr Newsletter. 26, 12 (2001).

H.M. Rietveld, A profile refinement method for nuclear and magnetic structures, J. Appl. Crystallogr. 2, 65 (1969) https://doi.org/10.1107/S002188986900656X.

T.B. Massalski, in: Binary Alloy Phase Diagrams (ASM, Metals Park, Ohio (1990).

H. Okamoto, Desk Handbook: Phase Diagrams for Binary Alloys, (Materials Park (OH): American Society for Metals, 2000).

I. Jandl, K.W. Richter, J. Alloys Compd. L6, 500 (2010) https://doi.org/10.1016/j.jallcom.2010.03.200.

Y.S. Pukas, R.E. Gladyshevskii, Phys. Chem. Solid State 8, 347 (2007).

A.G. Tharp, G.S. Smith, Q.C. Johnson, Acta Crystallogr. 20, 583 (1966) https://doi.org/10.1107/S0365110X66001294.

V.K. Pecharsky, O.Ya. Mruz, M.B. Konyk, P.S. Salamakha, P.K. Starodub, M.F. Fedyna, O.I. Bodak, J. Struct. Chem. 30(5), 96 (1989) (in Russian).