Indirect nuclear exchange coupling and electronic structure of the chain semiconductor TlSe: A Tl-203 and Tl-205 NMR study

Panich, AM
Hasanlı, Nızamı
We report an NMR study of the indirect nuclear exchange coupling, electronic structure, and wave-functions overlap in the single crystal of semiconductor TlSe which has a chain structure and comprises two kinds of Tl atoms, Tl1+ and Tl3+. Strong exchange coupling among the spins of Tl1+ and Tl3+ ions, which reside in neighboring chains, is observed. This interaction is significantly stronger than the exchange coupling of the equivalent atoms within the chains. Such an interchain coupling is realized due to the overlap of the Tl1+ and Tl3+ electron wave functions across the intervening Se atom. The aforementioned wave-function overlap is the dominant mechanism in the formation the uppermost valence bands and lower conduction bands in TlSe and determines the electronic structure and the main properties of the compound.


Direct epoxidation of propylene to propylene oxide on various catalytic systems: A combinatorial micro-reactor study
Kalyoncu, Sule; Duzenli, Derya; Önal, Işık; Seubsai, Anusorn; Noon, Daniel; Senkan, Selim (2015-02-10)
A combinatorial approach is used to investigate several bimetallic catalytic systems and the promoter effect on these catalysts to develop highly active and selective catalysts for direct epoxidation of propylene to propylene oxide (PO) using molecular oxygen. 2%Cu/5%Ru/c-SiO2 catalyst yielded the highest performance with high propylene conversion and PO selectivity among the bimetallic catalytic systems including silver, ruthenium, manganese and copper metals. On the other hand, the most effective catalyst...
Combinatorial development of LSF-based cathode materials for intermediate temperature solid oxide fuel cells
Kılıç, Fahrettin; Öztürk, Tayfur; Department of Metallurgical and Materials Engineering (2021-6)
This thesis focuses on the synthesis, characterization, and processing of LSF based composite cathode for solid oxide fuel cells. The cathode comprises three oxides; LSM, LSF and ScSZ which are synthesized by co-sputtering using combinatorial approach. The electrolyte was Scandia doped Zirconia(ScSZ), as it has attractive ionic conductivity at lower temperatures. Having chosen the electrolyte ScSZ as electrolyte. After detailed analysis with regard to conductivity and thermal expansion for each oxide, the c...
Experimental and mathematical investigation of mass transfer in food andhydrogel systems using magnetic resonance imaging and NMR relaxometry
Çıkrıkcı, Sevil; Öztop, Halil Mecit; Department of Food Engineering (2019)
Nuclear magnetic resonance (NMR) and Magnetic Resonance Imaging (MRI) are well-known non-invasive characterization methods used in a wide range of areas; from medical to food applications. NMR experiments are conducted either through spectroscopy with high resolution systems or with relaxometery (Time Domain NMR) through mid or low field systems. Time domain NMR is primarily based on relaxation times and diffusion measurements from the signal coming from the whole sample while MRI enables to visualize the i...
Direct Pyrolysis - Mass Spectrometry Analysis of Thermal Degradation of Thio-Click-Modified Poly(2-oxazoline)
Atilkan, Nurcan; Schlaad, Helmut; NUR, YUSUF; Hacaloğlu, Jale (2014-01-01)
Poly(2‐(3‐butenyl)‐2‐oxazoline)s (PBOX) with glucose‐S‐butyl (Glc) and perfluoroalkyl‐S‐butyl (F) side chains (three samples: Glc/F = 100/0, 0/100, and 88/12) are synthesized by ring‐opening polymerization of 2‐butenyl‐2‐oxazoline and thiol‐ene click photochemistry, and their thermal properties are analyzed by direct‐pyrolysis mass spectrometry. Significant changes in the thermal stability and thermal‐degradation products are observed depending on the structure of the side chain. The thermal degradation of ...
Magnetic Resonance Signal Analysis in Inhomogenous Magnetic Fields
Arpinar, V. E.; Eyüboğlu, Behçet Murat (2009-09-12)
Nuclear Magnetic Resonance (NMR) systems with inhomogenous main magnetic fields have been satisfactorily used to explore material properties. So that, imaging of biological tissues using Magnetic Resonance Imaging (MRI) systems with inhomogenous main magnetic fields could be explored. In this work, magnetic resonance (MR) signal deviation due to inhomogeneity in the main magnetic field of a MRI system is investigated. This analysis gives the understanding of the effect of inhomogeneity in magnetic field to ...
Citation Formats
A. Panich and N. Hasanlı, “Indirect nuclear exchange coupling and electronic structure of the chain semiconductor TlSe: A Tl-203 and Tl-205 NMR study,” PHYSICAL REVIEW B, pp. 0–0, 2001, Accessed: 00, 2020. [Online]. Available: