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Browsing by Subject "Crystal structure"

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    • Article  

      Ab-initio electronic structure calculations and properties of [SixSn1 − x]3N4 ternary nitrides 

      Pavloudis, T.; Zervos, Matthew; Komninou, P.; Kioseoglou, J. (2016)
      We carry out ab initio electronic structure calculations of (SixSn1 − x)3N4 using density functional theory with projector augmented-wave potentials under the generalized gradient approximation. We find that the energetically ...

    • Article  

      Bi/Sb distribution and its consequences in solid solution members of the thermoelectric materials K2Bi8-xSbxSe13 

      Kyratsi, Theodora; Chung, D. Y.; Kanatzidis, M. G. (2002)
      In an effort to understand the nature of mass fluctuations introduced when β-K2Bi8Se13 is alloyed with K2Sb8Se13 we determined the detailed crystal structures of two solid solutions of the type K2Bi8-xSbxSe13 with x=4.0 ...

    • Article  

      Catalytic behavior of La-Sr-Ce-Fe-O mixed oxidic/perovskitic systems for the NO+CO and NO+CH4+O2 (lean-NOx) reactions 

      Belessi, Vassiliki C.; Costa, Costas N.; Bakas, Thomas V.; Anastasiadou, T.; Pomonis, Phillippos J.; Efstathiou, Angelos M. (2000)
      Mixed oxides of the general formula La0.5SrxCeyFeOz were prepared by using the nitrate method and characterized by XRD and Mossbauer techniques. The crystal phases detected were perovskites LaFeO3 and SrFeO3-x and oxides ...

    • Article  

      Coordination Complexes of a Neutral 1,2,4-Benzotriazinyl Radical Ligand: Synthesis, Molecular and Electronic Structures, and Magnetic Properties 

      Morgan, I. S.; Mansikkamäki, Akseli; Zissimou, Georgia A.; Koutentis, Panayiotis Andreas; Rouzières, M.; Tuononen, H. M.; Clérac, R. (2015)
      A series of d-block metal complexes of the recently reported coordinating neutral radical ligand 1-phenyl-3-(pyrid-2-yl)-1,4-dihydro-1,2,4-benzotriazin-4-yl (1) was synthesized. The investigated systems contain the ...

    • Article  

      Core-shell PbS/Sn:In2O3 and branched PbIn2S4/Sn:In2O3 nanowires in quantum dot sensitized solar cells 

      Zervos, Matthew; Vasile, Eugeniu; Tanasǎ, Eugenia; Othonos, Andreas S. (2017)
      Core-shell PbS/Sn:In2O3 and branched PbIn2S4/Sn:In2O3 nanowires have been obtained via the deposition of Pb over Sn:In2O3 nanowires and post growth processing under H2S between 100 C-200 C and 300 C-500 C respectively. The ...

    • Article  

      Core-shell PbS/Sn:In2O3 and branched PbIn2S4/Sn:In2O3 nanowires in quantum dot sensitized solar cells 

      Zervos, Matthew; Vasile, E.; Vasile, E.; Othonos, A. (2017)
      Core-shell PbS/Sn:In2O3 and branched PbIn2S4/Sn:In2O3 nanowires have been obtained via the deposition of Pb over Sn:In2O3 nanowires and post growth processing under H2S between 100 C-200 C and 300 C-500 C respectively. The ...

    • Article  

      Data storage applications based on LiCoO2 thin films grown on Al2O3 and Si substrates 

      Svoukis, E.; Mihailescu, C. N.; Mai, V. H.; Schneegans, O.; Breza, K.; Lioutas, C.; Giapintzakis, John (2015)
      In this study, LiCoO2 thin films were investigated for data storage applications based on scanning probe mediated approaches. LiCoO2, compared to other materials proposed for scanning probe mediated nanoscale patterning, ...

    • Article  

      Gallium hydride vapor phase epitaxy of GaN nanowires 

      Zervos, Matthew; Othonos, Andreas S. (2011)
      Straight GaN nanowires (NWs) with diameters of 50 nm, lengths up to 10 μm and a hexagonal wurtzite crystal structure have been grown at 900°C on 0.5 nm Au/Si(001) via the reaction of Ga with NH3 and N2:H2, where the H2 ...

    • Article  

      Gallium hydride vapor phase epitaxy of GaN nanowires 

      Zervos, Matthew; Othonos, A. (2011)
      Straight GaN nanowires (NWs) with diameters of 50 nm, lengths up to 10 μm and a hexagonal wurtzite crystal structure have been grown at 900°C on 0.5 nm Au/Si(001) via the reaction of Ga with NH3 and N2:H2, where the H2 ...

    • Conference Object  

      Initial assessment of the thermoelectric properties for the mixed system K2-xRbxBi8Se13 

      Ireland, J. R.; Kyratsi, Theodora; Kanatzidis, M. G.; Kannewurf, C. R. (Affiliation: Dept. of Elec. and Comp. Engineering, Northwestern University, Evanston, IL 60208-3118, United StatesCorrespondence Address: Ireland, J.R.Dept. of Elec. and Comp. Engineering, Northwestern University, Evanston, IL 60208-3118, United States, 2002)
      In previous studies we have investigated the thermoelectric properties of undoped and doped compositions of β-K2Bi8Se13. The attempt to substitute Rb for K resulted in a different structure type, but with potentially useful ...

    • Article  

      Interaction of antimony(III) chloride with thiourea, 2-mercapto-5-methyl- benzimidazole, 3-methyl-2-mercaptobenzothiazole, 2-mercaptopyrimidine, and 2-mercaptopyridine 

      Ozturk, I. I.; Kourkoumelis, Nikolaos; Hadjikakou, Sotiris K.; Manos, Manolis J.; Tasiopoulos, Anastasios J.; Butler, I. S.; Balzarini, J.; Hadjiliadis, Nick (2011)
      New antimony(III) chloride complexes with heterocyclic thioamides, thiourea (TU), 2-mercapto- 5-methyl-benzimidazole (MMBZIM), 3-methyl-2- mercaptobenzothiazole (MMBZT), 2-mercaptopyrimidine (PMT), 2-mercaptopyridine (PYT) ...

    • Article  

      An investigation into the conversion of In2O3 into InN nanowires 

      Papageorgiou, Polina; Zervos, Matthew; Othonos, Andreas S. (2011)
      Straight In2O3 nanowires (NWs) with diameters of 50 nm and lengths ≥2 μm have been grown on Si(001) via the wet oxidation of In at 850°C using Au as a catalyst. These exhibited clear peaks in the X-ray diffraction corresponding ...

    • Article  

      An investigation into the conversion of In2O3 into InN nanowires 

      Papageorgiou, P.; Zervos, Matthew; Othonos, A. (2011)
      Straight In2O3 nanowires (NWs) with diameters of 50 nm and lengths ≥2 μm have been grown on Si(001) via the wet oxidation of In at 850°C using Au as a catalyst. These exhibited clear peaks in the X-ray diffraction corresponding ...

    • Article  

      La0.95Sr0.05Coo3: An efficient room-temperature thermoelectric oxide 

      Andrbulakis, J.; Migiakis, P.; Giapintzakis, John (2004)
      Electric resistivity, thermal conductivity, and the thermopower of polycrystalline Sr-doped LaCoO3 with composition La 0.9Sr0.5CoO3 were measured. The crystal structure of the synthesized powders was determined by x-ray ...

    • Article  

      Layered atomic structures of double oxides for low shear strength at high temperatures 

      Stone, D.; Liu, J.; Singh, D. P.; Muratore, C.; Voevodin, A. A.; Mishra, S.; Rebholz, Claus; Ge, Q.; Aouadi, S. M. (2010)
      Double oxide phases combining a transition metal and a noble metal have recently become a subject of investigation as solid lubricant materials for high-temperature tribological applications. Here, we study the changes in ...

    • Article  

      Low-temperature conversion of phenol into CO, CO 2 and H 2 by steam reforming over La-containing supported Rh catalysts 

      Constantinou, D. A.; álvarez-Galván, M. C.; Fierro, José Luis García; Efstathiou, Angelos M. (2012)
      The steam reforming of phenol in the low-temperature range of 350-550°C was studied over 0.5wt% Rh supported on Ce 0.15Zr 0.85O 2, Zr 0.93La 0.07O 2, and Ce 0.13Zr 0.83La 0.04O 2 mixed metal oxides. The reforming specific ...

    • Article  

      Magnetic properties of Fe3O4 thin films grown on different substrates by laser ablation 

      Paramês, M. L.; Viskadourakis, Z.; Rogalski, M. S.; Mariano, J.; Popovici, N.; Giapintzakis, John; Conde, O. (2007)
      Magnetite thin films have been grown onto (1 0 0)Si, (1 0 0)GaAs and (0 0 0 1)Al2O3, at substrate temperatures varying from 473 to 673 K, by UV pulsed laser ablation of Fe3O4 targets in reactive atmospheres of O2 and Ar, ...

    • Article  

      A missing oxidation-state level in the family of polyoxo(azide)octadecavanadate(IV/V) clusters: Synthesis, structure and antitumoural properties of [VIV11VV7O44(N3)]10 - In a sodium containing-3D architecture 

      Roubatis, Leonidas; Anastasiadis, Nikolaos C.; Paratriantafyllopoulou, C.; Moushi, Eleni E.; Tasiopoulos, Anastasios J.; Karkabounas, Spyridon Ch; Veltsistas, Panayotis Th; Perlepes, Spyros P.; Evangelou, Angelos M. (2016)
      The missing VIV11VV7 oxidation-state member of the polyoxooctadecavanadate(IV/V) - azide family of inorganic host-guest systems has been incorporated in a NaI-containing 3D architecture

    • Article  

      Modification of thermoelectric properties using insertion techniques 

      Hatzikraniotis, E.; Kyratsi, Theodora; Chrissafis, K.; Paraskevopoulos, K. M. (1999)
      In this work is presented the application insertion techniques for the modification of the performance of thermoelectric materials. The results indicate that in cases as in Bi2Se3 compounds where insertion of foreign species ...

    • Article  

      A new class of ferromagnetically-coupled mixed valence vanadium(IV/V) polyoxometalates 

      Manos, Manolis J.; Tasiopoulos, Anastasios J.; Tolis, Evangelos I.; Lalioti, N.; Woollins, J. D.; Slawin, A. M. Z.; Sigalas, Michael P.; Kabanos, Themistoklis A. (2003)
      Reaction of [VVIOCl2(thf)2] with a bidentate nitrogen-donor ligand (L: phen = 1,10-phenanthroline, 5-mephen = 5-methyl-1,10-phenanthroline, bipy = 2,2′-bipyridine, 5,5′-me2bipy = 5,5′-dimethyl-2,2′-bipy) in methyl alcohol, ...

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