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1999 (2)
1994 (1)
1Author    RuiHua XieRequires cookie*
 Title    Large Nonlinear Optical Response in Carbon Nitride Nanotube  
 Abstract    The third-order optical nonlinearity of a nitrogen doped car-bon nanotube is studied. It is found that carbon nitride nano-tubes are potentially important in photonics owing to their large nonlinear optical response. 
  Reference    Z. Naturforsch. 54a, 348—350 (1999); received March 19 1999 
  Published    1999 
  Keywords    Fullerene, Carbon Nanotube, Hyperpolarizability, Doping Effect 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0348_n.pdf 
 Identifier    ZNA-1999-54a-0348_n 
 Volume    54 
2Author    Klaus StöweRequires cookie*
 Title    Zur Struktur und Dotierung von Selenosilikaten: die Kristallstruktur von Er2S e S i0 4 und Er3 75Ca0 25Se2 75C10 25Si20 7 Structure and Doping of Seleno Silicates: the Crystal Structures of Er2SeSi04 and E r3 7^CaQ 2$Se2 ^C Iq ^Si^O-y  
 Abstract    Well-shaped brown and pink isometric crystals were obtained as by-products o f the syn­ thesis o f erbium selenides from the elements in evacuated and sealed silica ampoules with graphite inlets. They could be identified as erbium seleno m ono-and disilicates by energy dis­ persive X-ray fluorescence and X-ray structure determination. The monosilicate Er2S e S i0 4 crystallizes isotypically to N d 2S e S i0 4 in the space group Pbcm with the lattice parameters a = 600.2(2), b = 688.0(2), c = 1075.2(2) pm and represents the second known seleno inosilicate o f the rare earths. From X-ray structure analysis an isotypic relation between the disilicate Er3 75Ca0 25Se2 75C10 25Si20 7 and the com pound Sm4S3Si2O v was found, the former crystallizing in the space group 14,/am d with the lattice parameters a -1177.7(2) and c = 1376.5(2) pm. The doping o f the sorosilicate with the elements Ca and Cl originated from contam inations in the graphit inlets used in the procedure. 
  Reference    Z. Naturforsch. 49b, 733—7 (1994); eingegangen am 13. Januar 1994 
  Published    1994 
  Keywords    Erbium Seleno Silicates, Crystal Structures, Doping Effects 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0733.pdf 
 Identifier    ZNB-1994-49b-0733 
 Volume    49 
3Author    Rui-Hua Xie, Qin RaoRequires cookie*
 Title    Third-order Optical Nonlinearities of Higher Fullerene and Carbon Nanotube  
 Abstract    Recent theoretical and experimental studies on the third-order optical nonlinearities of higher fullerenes including C 7 o, C76, Cs4, Cs6, C90, C94 and C% are briefly reviewed. The extended Su-Schrieffer-Heeger model is introduced and applied to study the third-order optical nonlinearity of chiral carbon nanotubes (CCN), where the average contribution r of one carbon atom to the third-order optical nonlinearity of each CCN is calculated and compared with that of a well characterized polyenic polymer. It is found that (i) the smaller the diameter of a CCN, the larger the average contribution T; (ii) the metallic CCN favors larger third-order optical nonlinearity than the semiconducting one; (iii) CCN can compete with the conducting polymer achieving a large third-order optical susceptibility. Also the doping effect on the second-order hyperpolarizability of a tubular fullerene is investigated. It is found that the doping effect increases greatly the magnitude of the second-order hyperpolarizability of tubular fullerene. 
  Reference    Z. Naturforsch. 54a, 645—658 (1999); received July 23 1999 
  Published    1999 
  Keywords    Optical Susceptibility, Hyperpolarizability, Sum-over-state Approach, Resonance En-hancement, CM, Higher Fullerene, Tubular Fullerene, Carbon Nanotube, Chiral Effect, Doping Effect 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0645.pdf 
 Identifier    ZNA-1999-54a-0645 
 Volume    54