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Preparation and Crystal Structure of Ni 16 Si 9 Al
Author(s) -
Richter Klaus W.,
Prots Yurii,
Grin Yuri
Publication year - 2004
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200300316
Subject(s) - orthorhombic crystal system , crystallography , crystal structure , ternary operation , silicon , materials science , homogeneity (statistics) , covalent bond , aluminium , zintl phase , group (periodic table) , chemistry , metallurgy , statistics , mathematics , organic chemistry , computer science , programming language
The new ternary phase Ni 16 Si 9 Al was synthesized from the elements. The compound is formed in a presumably peritectoid reaction at 786 °C and has a narrow homogeneity range around the nominal composition. It adopts an orthorhombic structure (space group Cmcm ) related to Ni 3 Si 2 . It was found, that one particular position is occupied by aluminum together with silicon causing slight splitting and thus leading to a local symmetry break in the structure. Both, Ni 16 Si 9 Al and Ni 3 Si 2 , show related structural motifs and can be described by a combination of flat layers and puckered slabs with interatomic distances indicating covalent interactions between the atoms.