New Quaternary Compounds R3MnAl3Ge2 (R - Rare Earth)

Author:

Semuso Natalia1,Pukas Svitlana1,Tokaychuk Yaroslav O.1,Gladyshevskii Roman E.1

Affiliation:

1. Ivan Franko National University of Lviv

Abstract

Nine new quaternaryR3MnAl3Ge2alumogermanides (R= Sm, Gd-Lu) were synthesized by arc melting and their crystal structures were studied by X-ray powder diffraction. All of the compounds crystallize in hexagonal Y3NiAl3Ge2-type structures: Pearson symbolhP9, space groupP-62m. The unit-cell parameters of the isotypic compounds decrease with decreasing radius of the rare-earth metal. The hexagonal structure type Y3NiAl3Ge2(Z= 1) is a quaternary ordering variant of the binary type Fe2P (Z= 3) and the ternary types β1-K2UF6, Lu3CoGa5, Zr3Cu4Si2(Z= 1), ZrNiAl (Z= 3). It belongs to the family of structures with trigonal prismatic coordination of the small atoms.

Publisher

Trans Tech Publications, Ltd.

Subject

Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics

Reference25 articles.

1. J.T. Zhao, E. Parthé, Y3NiAl3Ge2, a quaternary substitution variant of the hexagonal Fe2P type, Acta Crystallogr. C 46 (1990) 2273-2276.

2. P. Villars, K. Cenzual (Eds.), Pearson's Crystal Data – Crystal Structure Database for Inorganic Compounds, Release 2017/18, ASM International, Materials Park (OH), (2017).

3. N. Semuso, S. Pukas, Ya. Tokaychuk, R. Gladyshevskii, New quaternary compounds in the R–T–Al–Ge systems, Book. Abstr. 19 Int. Conf. Solid Compd. Transition Elem., Genoa, 2014. p.148.

4. N. Semuso, Yu. Lutsushyn, S. Pukas, Ya. Tokaychuk, R. Gladyshevskii, New representatives of the structure type Y3NiAl3Ge2, Visn. Lviv Univ. Ser. Chem. 55 (2014) 135-141 (in Ukrainian).

5. N. Semuso, Yu. Lutsushyn, S. Pukas, Ya. Tokaychuk, R. Gladyshevskii, New quaternary alumogermanides with the structure type Y3NiAl3Ge2, Visn. Lviv Univ. Ser. Chem. (2018) (in Ukrainian) (in press).

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