Browsing by Subject "temperature dependence"

Article

A2Bi8Se13 (A = Rb, Cs), CsBi3.67Se6, and BaBi2Se4: New ternary semiconducting bismuth selenides

Iordanidis, L.; Brazis, P. W.; Kyratsi, Theodora; Ireland, J.; Lane, M.; Kannewurf, C. R.; Chen, W.; Dyck, J. S.; Uher, C.; Ghelani, N. A.; Hogan, T.; Kanatzidis, M. G. (2001)

Rb2Bi8Se13 (I), Cs2Bi8Se13 (II), CsBi3.67Se6 (III), and BaBi2Se4 (IV) were synthesized by direct combination reactions of the A/Se (A = Rb, Cs, Ba) and Bi2Se3 at ≥650 °C. Their structures were determined by single-crystal ...

Article

The anomalous sorptive behaviour of Zsm-5 and silicalite-I: Observation of low-pressure hysteresis in nitrogen adsorption

Kyriakou, Georgia; Theocharis, Charis R. (2002)

A first stage of a systematic study of the nature of the low-pressure hysteresis loop observed in the nitrogen adsorption isotherms of some MFI zeolites is presented. It was shown that the pressure at which occurrence of ...

Article

CsMBi3Te6 and CsM2Bi3Te7 (M = Pb, Sn): New thermoelectric compounds with low-dimensional structures

Hsu, K. F.; Chung, D. Y.; Lal, S.; Mrotzek, A.; Kyratsi, Theodora; Hogan, T.; Kanatzidis, M. G. (2002)

The new materials CsPbBi3Te6 nad CsPb2Bi3Te7 were discovered through reactions of CsBi4Te6 with PbTe, whereas the isostructural materials CsSnBi3Te6 and CsSn2Bi3Te7 were discovered through corresponding reactions with SnTe. ...

Article

Electronic structure of K 2Bi 8Se 13

Bilc, D. I.; Mahanti, S. D.; Kyratsi, Theodora; Chung, D. Y.; Kanatzidis, M. G.; Larson, P. (2005)

K 2Bi 8Se 13 belongs to a class of complex chalcogenides that shows potential for superior thermoelectric performance. This compound forms in two distinct phases, α and β. The β phase, which has several sites with mixed ...

Article

Ferromagnetic and antiferromagnetic interactions in lanthanum cobalt oxide at low temperatures

Androulakis, J.; Katsarakis, N.; Giapintzakis, John (2001)

Systematic dc and ac magnetic susceptibility studies have been performed on single-phase (formula presented) powder samples. Evidence is presented in support of the existence of ferromagnetic (FM1, FM2) and antiferromagnetic ...

Article

Giant single-molecule magnets: A {Mn84} torus and its supramolecular nanotubes

Tasiopoulos, Anastasios J.; Vinslava, A.; Wernsdorfer, W.; Abboud, K. A.; Christou, George (2004)

A meeting of two magnetic worlds: The giant (ca. 4.2 nm) {Mn84} cluster, shown, has a torus structure and is a single-molecule magnet (SMM). It represents a meeting of the molecular (bottom-up) and classical (top-down) ...

Article

Inducing single-molecule magnetism in a family of loop-of-loops aggregates: Heterometallic Mn40Na4 clusters and the homometallic Mn44 analogue

Moushi, Eleni E.; Lampropoulos, Christos; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2010)

The syntheses, crystal structures, and magnetic properties of a new family of heterometallic Mn40Na4 and homometallic Mn44 loop-of-loops aggregates are reported. The reactions of [Mn3O(O 2CMe)6(py)3]•py with 1,3-propanediol ...

Article

LaSrMnCoO6: A new cubic double perovskite oxide

Androulakis, J.; Katsarakis, N.; Giapintzakis, John; Vouroutzis, N.; Pavlidou, E.; Chrissafis, K.; Polychroniadis, E. K.; Perdikatsis, V. (2003)

Single-phase polycrystalline powder samples of the double perovskite oxide LaSrMnCoO6 were synthesized by the Pechini (citrate-gel) technique. The structural, magnetic and electrical properties of the obtained powders were ...

Article

Mathematical modeling of the oxygen storage capacity phenomenon studied by CO pulse transient experiments over Pd/CeO2 catalyst

Costa, Costas N.; Christou, Stavroula Y.; Georgiou, Georgios C.; Efstathiou, Angelos M. (2003)

A mathematical model has been developed for the first time to study the oxygen storage capacity (OSC) phenomenon by the CO pulse injection technique over a 1 wt% Pd/CeO2 model catalyst in the 500-700°C range. A two-step ...

Article

Mathematical modeling of the oxygen storage capacity phenomenon studied by CO pulse transient experiments over Pd/CeO2 catalystAAA

Costa, Costas N.; Christou, Stavroula Y.; Georgiou, Georgios C.; Efstathiou, Angelos M. (2003)

A mathematical model has been developed for the first time to study the oxygen storage capacity (OSC) phenomenon by the CO pulse injection technique over a 1 wt% Pd/CeO2 model catalyst in the 500-700°C range. A two-step ...

Article

Of ortho-conjugatively linked reactive intermediates: The cases of ortho-phenylene-(bis)nitrene, -carbenonitrene, and -(bis)carbene

Nicolaïdes, Andrew N.; Nakayama, T.; Yamazaki, K.; Tomioka, H.; Koseki, S.; Stracener, L. L.; McMahon, R. J. (1999)

ortho-Phenylene-bisnitrene (2) and -carbenonitrene (3) were generated in an inert matrix at low temperature, characterized by IR spectroscopy, and identified with the help of DFT calculations. Their thermal and photochemical ...

Article

Reactivation of an aged commercial three-way catalyst by oxalic and citric acid washing

Christou, Stavroula Y.; Birgersson, H.; Fierro, José Luis García; Efstathiou, Angelos M. (2006)

The efficiency of dilute oxalic and citric acid solutions on improving the oxygen storage capacity (OSC) and catalytic activity of a severely aged (83 000 km) commercial three-way catalyst (TWC) has been investigated. ...

Article

A single-chain magnet based on linear [MnIII2MnII] units

Papatriantafyllopoulou, Constantina; Zartilas, Sotiris M.; Manos, Manolis J.; Pichon, C.; Tasiopoulos, Anastasios J.; Clérac, R. (2014)

The synthesis, structural characterization and magnetic properties of a 1D coordination polymer based on a linear mixed valent [MnIII2MnII] repeating unit are described. It displays single-chain magnet (SCM) behaviour with ...

Article

Spin-triplet excitons in 1,3-diphenyl-7-(fur-2-yl)-1,4-dihydro-1,2,4- benzotriazin-4-yl

Constantinides, Christos P.; Carter, E.; Murphy, D. M.; Manoli, Maria; Leitus, G. M.; Bendikov, M.; Rawson, J. M.; Koutentis, Panayiotis Andreas (2013)

7-(Fur-2-yl)benzotriazinyl 1 is the first example of a hydrazyl radical dimer with a thermally accessible triplet state. The triplet exciton (|D| = 0.018 cm-1, |E| = 0.001 cm-1) was observed by solid-state VT-EPR spectroscopy ...

Article

Thickness dependence of Hall transport in Ni1.15Mn 0.85Sb thin films on silicon

Branford, W. R.; Clowes, S. K.; Bugoslavsky, Y. V.; Gardelis, S.; Androulakis, J.; Giapintzakis, John; Grigorescu, C. E. A.; Manea, S. A.; Freitas, R. S.; Roy, S. B.; Cohen, L. F. (2004)

Highly spin polarized Heusler alloys, NiMnSb and Co2MnSi, attract a great deal of interest as potential spin injectors for spintronic applications. Spintronic devices require control of interfacial properties at the ...

Article

Time-resolved resonance Raman studies of halooxide photoisomerization kinetics

Hayes, Sophia C.; Cooksey, C. C.; Reid, P. J. (2003)

The condensed-phase photoisomerization dynamics of chlorine dioxide and dichlorine monoxide are investigated using femtosecond pump-probe and time-resolved resonance Raman. These studies demonstrate that photoisomerization ...