Browsing by Subject "Crystalline materials"

Now showing items 1-17 of 17

    • Article  

      Control of the morphology of crystalline calcium hydroxide 

      Theocharis, Charis R.; Pashalidis, Ioannis; Jordan, Stephanie L.; Gray, A. C.; Yeates, D. (2001)
      The reaction of solid calcium hydroxide with liquid or gaseous methanol, ethanol and toluene, and the effect this has on the surface properties of the solid was examined, as well as the modification of crystal habit by the ...
    • Article  

      Crystal/glass phase change in KSb5S8 studied through thermal analysis techniques 

      Chrissafis, K.; Kyratsi, Theodora; Paraskevopoulos, K. M.; Kanatzidis, M. G. (2004)
      The reversible crystal-glass and glass-crystal transitions discovered in KSb5S8 were studied in detail with nonisothermal scanning calorimetry techniques. When cooled, molten KSb5S8 becomes a metastable glass, which can ...
    • Article  

      The effect of correlated and point defects on the vortex lattice melting transition in single-crystal YBa2Cu3O7-δ 

      Kwok, W. K.; Fendrich, J.; Fleshler, S.; Welp, U.; Downey, J.; Crabtree, G. W.; Giapintzakis, John (1994)
      The vortex melting transition Tm in several untwinned and twinned crystals is measured resistively in fields up to 8T. A Lindemann criterion for vortex lattice melting is obtained in addition to a sharp hysteresis in the ...
    • Article  

      Effect of sintering in ball-milled K 2Bi 8Se 13 thermoelectric nano-composites 

      Hatzikraniotis, E.; Ioannou, M.; Chrissafis, K.; Chung, D. Y.; Paraskevopoulos, K. M.; Kyratsi, Theodora (2012)
      K 2Bi 8Se 13 has many attractive features for thermoelectric applications. Recently, K 2Bi 8Se 13-based nanocomposite materials, consisting of nano-crystalline, micro-crystalline and amorphous phases, have been fabricated ...
    • Article  

      Enhanced photon harvesting in silicon multicrystalline solar cells by new lanthanide complexes as light concentrators 

      Katsagounos, G.; Stathatos, Elias; Arabatzis, N. B.; Keramidas, Anastasios D.; Lianos, P. (2011)
      Four europium complexes with enhanced luminescent properties have been synthesized. Thin transparent films of the complexes were prepared on glass panes and then were examined as efficient luminescent solar concentrators ...
    • Article  

      Flexible lanthanide MOFs as highly selective and reusable liquid MeOH sorbents 

      Efthymiou, Constantinos G.; Kyprianidou, Eleni J.; Milios, Constantinos J.; Manos, Manolis J.; Tasiopoulos, Anastasios J. (2013)
      A series of new 3-D Ln3+ metal-organic frameworks (MOFs), which are based on the semi-rigid ligand H3CIP [H3CIP = 5-(4-carboxybenzylideneamino)isophthalic acid], [Ln2(CIP) 2(DMF)4-x(H2O)x] (Ln3+ = La3+, Ce3+, Pr3+, Sm3+, ...
    • Conference Object  

      IR reflectivity studies of mechanically alloyed PbTe nanocrystals 

      Hasapis, T. Ch; Papageorgiou, C.; Hatzikraniotis, E.; Kyratsi, Theodora; Paraskevopoulos, K. M. (Affiliation: Department of Physics, Aristotle University of Thessaloniki, 54123 Thessaloniki, GreeceAffiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678 Nicosia, CyprusCorrespondence Address: Hasapis, T. Ch.Department of Physics, Aristotle University of Thessaloniki, 54123 Thessaloniki, Greece, 2009)
      Nano-crystalline lead telluride powder was synthesized by mechanical alloying using a high-energy planetary ball mill. The broadening of the X-ray diffraction peaks vs ball milling time, indicates small crystalline size ...
    • Article  

      Lattice thermal conductivity of K 2(Bi 1-zSb z) 8Se 13 solid solutions 

      Kyratsi, Theodora; Hatzikraniotis, E.; Paraskevopoulous, M.; Dyck, J. S.; Shin, H. K.; Uher, C.; Kanatzidis, M. G. (2004)
      The influence of the Bi/Sb partial substitution to the lattice thermal conductivity of the K 2(Bi 1-zSb z) 8Se 13 solid solution series was studied. The variation of the lattice thermal conductivity with comparison was ...
    • Article  

      A microporous Co2+ metal organic framework with single-crystal to single-crystal transformation properties and high CO2 uptake 

      Moushi, Eleni E.; Kourtellaris, Andreas; Spanopoulos, Ioannis; Manos, Manolis J.; Papaefstathìou, Giannis S.; Trikalitis, Pantelis N.; Tasiopoulos, Anastasios J. (2015)
      The synthesis and characterization of {[Co9(INA)18(H2O)6]·11DMF·15H2O}∞ (Co9-INA·11DMF·15H2O) (INA- = the anion of isonicotinic acid) is reported. It exhibits a rigid 3D-porous structure with a Co9 repeating unit consisting ...
    • Article  

      Progress in photothermal microscopy of YBa2Cu3O7-x 

      Studenmund, W. R.; Fishman, I. M.; Kino, G. S.; Giapintzakis, John (1998)
      We present recent differential optical reflectivity (DOR) measurements obtained at 633 nm (2.OeV), 780 nm (1.6eV), 1064 nm (1.16eV), and 1310nm (0.95 eV). We discuss calibration techniques which can correct for variations ...
    • Article  

      Pulsed-laser deposition of NiMnSb thin films at moderate temperatures 

      Giapintzakis, John; Grigorescu, C.; Klini, A.; Manousaki, A.; Zorba, V.; Androulakis, J.; Viskadourakis, Z.; Fotakis, C. (2002)
      Thin films of the half-Heusler alloy NiMnSb, which is predicted by band-structure calculations to be a half-metallic ferromagnet, were grown on various substrates (Si and InAs) using pulsed-laser deposition. The growth ...
    • Article  

      Recent advances in spintronics. Half-metal ferromagnets: Their role in spintronics 

      Gardelis, S.; Androulakis, J.; Migiakis, P.; Giapintzakis, John (2004)
      A review of recent advances in spintronics is presented. We report the structural, magnetic, electrical and thermal properties of the ferromagnetic half-Heusler alloy NiMnSb grown by arcmelting. The bulk material is used ...
    • Article  

      Single crystal coordinating solvent exchange as a general method for the enhancement of the photoluminescence properties of lanthanide MOFsAAA 

      Kyprianidou, Eleni J.; Lazarides, T.; Kaziannis, S.; Kosmidis, C.; Itskos, Grigorios; Manos, Manolis J.; Tasiopoulos, Anastasios J. (2014)
      The discovery of new methods for the post-synthesis modification of materials is essential in order to establish suitable strategies for the tuning of their properties in a rational manner. Here we present a series of ...
    • Article  

      Single crystal coordinating solvent exchange as a general method for the enhancement of the photoluminescence properties of lanthanide MOFsAAA 

      Kyprianidou, Eleni J.; Lazarides, T.; Kaziannis, S.; Kosmidis, C.; Itskos, Grigorios; Manos, Manolis J.; Tasiopoulos, Anastasios J. (2014)
      The discovery of new methods for the post-synthesis modification of materials is essential in order to establish suitable strategies for the tuning of their properties in a rational manner. Here we present a series of ...
    • Article  

      Solvothermal synthesis, nanostructural characterization and gas cryo-adsorption studies in a metal–organic framework (IRMOF-1) material 

      Tzitzios, V.; Kostoglou, N.; Giannouri, M.; Basina, G.; Tampaxis, C.; Charalambopoulou, Georgia; Steriotis, T.; Polychronopoulou, K.; Doumanidis, C. C.; Mitterer, C.; Rebholz, Claus (2017)
      A nanoporous metal–organic framework material, exhibiting an IRMOF-1 type crystalline structure, was prepared by following a direct solvothermal synthesis approach, using zinc nitrate and terephthalic acid as precursors ...
    • Article  

      Study of the annealing kinetic effect and implantation energy on phosphorus-implanted silicon wafers using spectroscopic ellipsometry 

      Lioudakis, Emmanouil E.; Christofides, Constantinos; Othonos, Andreas S. (2006)
      In this work, we have studied the changes in the optical properties on crystalline silicon implanted wafers (1 × 1013-1 × 1016 P+/cm2) using an extensive ellipsometric analysis. The effects of implantation energy (20-180 ...
    • Article  

      Triplet excitation energy dynamics in metal-organic frameworks 

      Lin, J.; Hu, X.; Zhang, P.; Van Rynbach, A.; Beratan, David N.; Kent, C. A.; Mehl, B. P.; Papanikolas, J. M.; Meyer, T. J.; Lin, W.; Skourtis, Spiros S.; Constantinou, Martha G. (2013)
      Metal-organic frameworks (MOFs) are appealing candidates for use in energy harvesting and concentrating because of their high chromophore density and structural tunability. The ability to engineer electronic excitation ...