| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Steinberg, Simon
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Insights into a Defective Potassium Sulfido Cobaltate: Giant Magnetic Exchange Bias, Ionic Conductivity, and Electrical Permittivity
- 2021Exploring the frontier between polar intermetallics and Zintl phases for the examples of the prolific ALnTnTe<sub>3</sub>-type alkali metal (A) lanthanide (Ln) late transition metal (Tn) telluridescitations
- 2021Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge 15 Te 85citations
- 2021Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge<sub>15</sub>Te<sub>85</sub>citations
- 2020Revealing the Bonding Nature in an ALnZnTe3-Type Alkaline-Metal (A) Lanthanide (Ln) Zinc Telluride by Means of Experimental and Quantum-Chemical Techniquescitations
- 2017Layered Structures and Disordered Polyanionic Nets in the Cation-Poor Polar Intermetallics CsAu1.4Ga2.8 and CsAu2Ga2.6citations
- 2016Gold in the Layered Structures of R3Au7Sn3: From Relativity to Versatilitycitations
- 2016Gold in the Layered Structures of R3Au7Sn3citations
- 2015Cation-Poor Complex Metallic Alloys in Ba(Eu)-Au-Al(Ga) Systemscitations
- 2015Crystal Structure and Bonding in BaAu5Ga2 and AeAu4+ xGa3- x (Ae = Ba and Eu)citations
- 2015Gold-rich R3Au7Sn3: establishing the interdependence between electronic features and physical propertiescitations
- 2015Gold-rich R3Au7Sn3citations
Places of action
| Organizations | Location | People |
|---|
article
Cation-Poor Complex Metallic Alloys in Ba(Eu)-Au-Al(Ga) Systems
Abstract
<p>Four complex intermetallic compounds BaAu<sub>6±x</sub>Ga<sub>6±y</sub> (x = 1, y = 0.9) (I), BaAu<sub>6±x</sub>Al<sub>6±y</sub> (x = 0.9, y = 0.6) (II), EuAu<sub>6.2</sub>Ga<sub>5.8</sub> (III), and EuAu<sub>6.1</sub>Al<sub>5.9</sub> (IV) have been synthesized, and their structures and homogeneity ranges have been determined by single crystal and powder X-ray diffraction. Whereas I and II originate from the NaZn<sub>13</sub>-type structure (cF104-112, Fm3Ic), III (tP52, P4/nbm) is derived from the tetragonal Ce<sub>2</sub>Ni<sub>17</sub>Si<sub>9</sub>-type, and IV (oP104, Pbcm) crystallizes in a new orthorhombic structure type. Both I and II feature formally anionic networks with completely mixed site occupation by Au and triel (Tr = Al, Ga) atoms, while a successive decrease of local symmetry from the parental structures of I and II to III and, ultimately, to IV correlates with increasing separation of Au and Tr on individual crystallographic sites. Density functional theory-based calculations were employed to determine the crystallographic site preferences of Au and the respective triel element to elucidate reasons for the atom distribution ("coloring scheme"). Chemical bonding analyses for two different "EuAu<sub>6</sub>Tr<sub>6</sub>" models reveal maximization of the number of heteroatomic Au-Tr bonds as the driving force for atom organization. The Fermi levels fall in broad pseudogaps for both models allowing some electronic flexibility. Spin-polarized band structure calculations on the "EuAu<sub>6</sub>Tr<sub>6</sub>" models hint to singlet ground states for europium and long-range magnetic coupling for both EuAu<sub>6.2</sub>Ga<sub>5.8</sub> (III) and EuAu<sub>6.1</sub>Al<sub>5.9</sub> (IV). This is substantiated by experimental evidence because both compounds show nearly identical magnetic behavior with ferromagnetic transitions at T<sub>C</sub> = 6 K and net magnetic moments of 7.35 μ<sub>B</sub>/f.u. at 2 K. The effective moments of 8.3 μ<sub>B</sub>/f.u., determined from Curie-Weiss fits, point to divalent oxidation states for europium in both III and IV.</p>