Structure-composition relations for the partly disordered Hume-Rothery phase Ir7+7deltaZn97-11delta (0.31< or =delta< or =0.58)

Chemistry : a European Journal
Wolfgang HornfeckB Harbrecht

Abstract

The crystal structure, its variation within the homogeneity range and some physical properties of the new zinc-rich, partly disordered phase Ir7+7deltaZn97-11delta (0.31< or =delta< or =0.58) are reported. The structures of three phases with distinct composition were determined by means of single crystal X-ray diffraction. Ir7+7deltaZn97-11delta exhibits a significant homogeneity range, adopts a complex gamma-brass related cubic structure (cF403-406), is stable up to 1201(2) K, and transforms sluggishly below 1048(4) K into a phase with 394 atoms in the monoclinic primitive unit cell. It is a diamagnetic, moderate metallic conductor. Six distinguishable clusters consisting of 22-29 atoms comprise the structure. The clusters are situated about the 16 high symmetry points of the cubic F lattice. The structure can be subdivided into two partial structures, one with constant composition IrZn5 and 192 atoms per unit cell and a second being significantly richer in zinc with variable composition and 211-214 atoms per unit cell. The meandering triply periodic minimal surface of two interpenetrating diamond-like nets separates the compositionally variable from its complementary invariant part. The phase width is coupled with substitutio...Continue Reading

Citations

Nov 15, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Céline Allio, Bernd Harbrecht
Aug 31, 2007·Chemistry : a European Journal·Robert F BergerRoald Hoffmann
Mar 19, 2008·Chemistry : a European Journal·Robert F BergerJiaqi Xu
Aug 10, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Ding-Bang XiongJan Ma
Apr 8, 2010·Chemistry : a European Journal·Srinivasa Thimmaiah, Gordon J Miller
Jul 22, 2011·Acta Crystallographica. Section B, Structural Science·Julia DshemuchadseWalter Steurer
Aug 25, 2020·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Sivaprasad GhantaPartha Pratim Jana
Feb 9, 2007·Angewandte Chemie·Daniel C FredricksonRoald Hoffmann
Sep 17, 2013·Inorganic Chemistry·Partha P JanaSven Lidin
Oct 3, 2013·Inorganic Chemistry·Arina A PankovaDavide M Proserpio

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