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Articles by Alim Ormeci
BaIr2Si9: A Hybrid Structure Bridging Sodalite, Clathrate, and Skutterudite Patterns
1 Introduction Intermetallic clathrates of group 14 elements feature four-bonded networks where electropositive metal atoms are enclosed within polyhedral cages [1, 2]. Charge balance is achieved by substitutional atoms acting as electron acceptors or by forming Zintl defects [3]. However, silicon clathrates are exceptional due to the strong Si–Si bonds, allowing clathrate-I phases like Na2Ba6Si46 [4-7], Sr8Si46 [8], or Ba8-xSi46 [9-13] to tolerate excess electrons.
Slab Rotation by Transition‐Metal Relocation in the Layered Zintl Phase Li2ZnSi
1 Introduction Layered lithium intercalation compounds serve as important electrode materials for batteries. The observed degradation during charge-discharge cycles is linked to defect formation involving slab gliding and transition-metal migration.[1] Understanding these defects is crucial for material optimization.
Atomic coordination, Chemical Bonding and Electronic State of Praseodymium in Pr2Si7
Supporting Information As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.
Real Structure, Magnetism and Chemical Bonding of SmSi3−x
Introduction Compounds with extended polyanions represent an attractive class of materials regarding structural diversity and physical properties. The extended polyanionic structures formed by elements like silicon are often electron precise so that the interrelation of electron count and number of covalent bonds is in accord with the 8-N rule and the Zintl concept.1-3 Regarding chemical composition, phases like CaSi2 represent the silicon-richest compounds in binary systems at ambient pressure.
Ordering by cation replacement in the system Na2−xLixGa7
Ordering by cation replacement in the system Na2−xLixGa7† Samples of the pseudo-binary system Na2−xLixGa7 (x ≤ 1) were synthesized from the elements at 300 °C in sealed Ta ampoules or by the reaction of Na2Ga7 with LiCl. The peritectic formation temperature decreases with increasing Li content from 501(2) °C (x = 0) to 489(2) °C (x = 1). The boundary compositions Na2Ga7 and Na1Li1Ga7 crystallize with different structure types related by a group–subgroup relation.
Al-Pt compounds catalyzing the oxygen evolution reaction
Al–Pt compounds catalyzing the oxygen evolution reaction† Ana María Barrios Jiménez,a Olga Sichevych, a Ioannis Spanos, b Simone G. Altendorf, a Alim Ormeci a and Iryna Antonyshyn *ac Abstract Al–Pt compounds have been systematically studied as electrocatalysts for the oxygen evolution reaction (OER). Considering the harsh oxidative conditions of the OER, all Al–Pt compounds undergo modifications during electrochemical experiments.
Frontispiece: The Reduced Nitridogermanates(III) Ca6[Ge2N6] and Sr6[Ge2N6] with Ge−Ge Bonds
Frontispiece Dr. Peter Höhn Corresponding Author peter.hoehn@cpfs.mpg.de Chemical Metals Science, Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany Search for more papers by this author PDF ShareShare Abstract Nitridogermanates In their Research Article on page 7691, Peter Höhn, Rainer Niewa et al.
The Reduced Nitridogermanates(III) Ca6[Ge2N6] and Sr6[Ge2N6] with Ge−Ge Bonds
Abstract The first nitridogermanates(III) Ca6[Ge2N6] and Sr6[Ge2N6] were synthesized from sodium flux and structurally characterized by powder and single crystal X‐ray diffraction, respectively. They crystallize isostructurally to each other and homeotypic to Ca6[Cr2N6]H in space group R . They feature unprecedented, mutually isolated, ethane‐like [GeIII2N6]12− anions in a staggered conformation.
Interplay of atomic interactions in the intermetallic semiconductor Be5Pt
Research Article Interplay of atomic interactions in the intermetallic semiconductor Be5Pt Yuri Grin Corresponding Author E-mail address: grin@cpfs.mpg.de Max-Planck-Institut fur Chemische Physik fester Stoffe, Chemische Metallkunde, Nöthnitzer Str. 40, 1187 Dresden, GERMANY Search for more papers by this author PDF PDF Share Abstract Semiconducting substances form one of the most important families of functional materials. However, semiconductors containing only metals are very rare.
Intermediate-Valence Intermetallic Phase YbIn1-xAu1+x (x = 0-0.3)
Polycrystalline samples YbIn Au were prepared by reaction of the elements in sealed tantalum tubes at 1170 K with a subsequent annealing at 770 K. The crystal structures of YbInAu (space group P6;?2m, a = 7.6992(8), c = 4.0333(5) Å, wR2 = 0.035, 282 reflections and 14 variables) and YbIn Au (P6;?2m, a = 7.706(3), c = 4.011(1) pm, wR2 = 0.035, 275 reflections, 14 parameters) were refined from single crystal X-ray diffraction data. The phase YbIn Au has a homogeneity range for 0.0?x?0.3 (770 K).
Enhanced thermoelectric properties of the Zintl phase BaGa2Sb2 via doping with Na or K
Na- and K-doped samples of Ba1-x(Na, K)xGa2Sb2 were prepared by ball-milling followed by hot-pressing. The topological analysis of the electron density of BaGa2Sb2 implies a polar covalent nature of the Sb–Ga bonds in which the Sb atoms receive the electrons transferred from Ba rather than the Ga atoms. Successful doping of BaGa2Sb2 with Na or K was confirmed with combined microprobe and X-ray diffraction analysis.
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