TITLE

Structure, disorder, and phase transition in ternary crystals of anthracene, phenanthrene, and tetracyanobenzene, AxPh1-xTCNB

AUTHOR(S)
Lefebvre, J.; Rohleder, K.; Mierzejewski, A.; Luty, T.
PUB. DATE
February 1995
SOURCE
Journal of Chemical Physics;2/1/1995, Vol. 102 Issue 5, p2165
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The structure of ternary, charge-transfer crystals of anthracene, phenanthrene, and tetracyanobenzene, AxPh1-xTCNB, in a wide range of concentrations has been studied. We have focused on the problem of substitutional and orientational disorder of anthracene and phenanthrene molecules and its influence on the orientational instability. The crystal structure determination has been performed at room temperature and 120 K, and the refinement procedures allowed us to determine the orientational disorder for different concentrations. The phase diagram for the orientational phase transition with symmetry change, C2/m to P21/a, has been determined and a critical concentration (xc=0.74) was found. The disorder and the phase diagram has been successfully modeled by a minimization of the crystal energy using the ‘‘split molecule’’ concept and the virtual crystal approximation to mimic both orientational and substitutional disorders. The ternary crystals, their structure, disorder, and phase transitions are well understood in terms of a competition between orientational disorder of anthracene molecules and local stresses created by the substitutional disorder (with statistical orientations) of phenanthrene molecules. A possibility for an existence of molecular orientational glassy state is suggested for concentrations below the critical one. © 1995 American Institute of Physics.
ACCESSION #
7610698

 

Related Articles

  • Effect of vacancies on the charge-transfer energy in the anthracene crystal. Tsiaousis, D.; Munn, R. W. // Journal of Chemical Physics;7/22/2002, Vol. 117 Issue 4, p1833 

    In order to explore whether vacancies could trap charge-transfer (CT) states, the polarization and charge-quadrupole energies of CT configurations near vacancies in anthracene are calculated. Polarization and charge-quadrupole energies of single charges and of CT configurations in perfect...

  • Mean field approach to orientational transitions in charge–transfer molecular crystals. Luty, Tadeusz; Kuchta, Bogdan // Journal of Chemical Physics;10/1/1986, Vol. 85 Issue 7, p4032 

    The mean field approach to orientational transitions in two-component molecular crystals has been formulated and illustrated by numerical calculations for two model systems: complexes of tetracyanobenzene (TCNB) with naphthalene (N–TCNB) and anthracene (A–TCNB). The study had...

  • Analysis of the Charge Transfer Mechanisms Responsible for the Current�Voltage Characteristics of Ca[sub 4]Ga[sub 2]S[sub 7] : Eu[sup 3+] Single Crystals. Tagiev, B. G.; Kasumov, U. F.; Musaeva, N. N.; Dzhabbarov, R. B. // Physics of the Solid State;Mar2003, Vol. 45 Issue 3, p426 

    The current-voltage characteristics of Ca[sub 4]Ga[sub 2]S[sub 7]: Eu[sup 3+] single crystals are measured for the first time, and the processes affecting these characteristics are analyzed theoretically. It is demonstrated that Ca[sub 4]Ga[sub 2]S[sub 7]: Eu[sup 3+] single crystals are...

  • Light-induced charge transport processes in photorefractive crystals II: Materials. Buse, K. // Applied Physics B: Lasers & Optics;1997, Vol. 64 Issue 4, p391 

    The charge transport processes in different photorefractive oxide crystals are reviewed and consequences for applications are outlined. � The light-induced charge transport processes in LiNbO[sub 3] , LiTaO[sub 3] , BaTiO[sub 3] , Ba[sub 1-x] Sr[sub x] TiO[sub 3] (

  • Switching effect in organic charge transfer complex crystals. Iwasa, Y.; Koda, T.; Tokura, Y.; Koshihara, S.; Iwasawa, N.; Saito, G. // Applied Physics Letters;11/13/1989, Vol. 55 Issue 20, p2111 

    A reproducible current switching effect has been observed in various mixed-stack organic charge transfer crystals whose ionicities are close to the neutral-ionic phase boundary. This effect appears to be related to the intrinsic nonlinear conductivity, which has recently been reported in these...

  • Theoretical Interpretation of the electroabsorption spectra of polyacene crystals. II. Charge... Slawik, Michal; Petelenz, Piotr // Journal of Chemical Physics;10/22/1999, Vol. 111 Issue 16, p7576 

    Discusses a theoretical interpretation of the electroabsorption spectra of polyacene crystals. Focus on the charge transfer manifold where symmetry considerations reject the existence of eigenstates endowed with non-zero dipole moment; Two-state model of the interaction with electric field.

  • Ground state optical properties of charge transfer crystals close to the neutral-ionic interface: Tetrathiafulvalene-2,5-dichloro-p-benzoquinone. Girlando, Alberto; Painelli, Anna; Pecile, Cesare; Calestani, Gianluca; Rizzoli, Corrado; Metzger, Robert M. // Journal of Chemical Physics;5/15/1993, Vol. 98 Issue 10, p7692 

    The crystal structure and the optical data of the (1:1) charge-transfer (CT) complex of tetrathiafulvalene (TTF) with 2,5-dichloro-p-benzoquinone (2,5Cl2BQ) are reported, yielding a full characterization of the ground state properties. The complex crystallizes in the triclinic space group P1,...

  • Light-induced change of charge transfer band in nanocrystalline Y[sub 2]O[sub 3]:Eu[sup 3+]. Song, Hongwei; Chen, Baojiu; Peng, Hongshang; Zhang, Jisen // Applied Physics Letters;9/2/2002, Vol. 81 Issue 10, p1776 

    In this letter, we report the observation of ultraviolet light-induced change of excited charge-transfer band in nanocrystalline Y[sub 2]O[sub 3]:Eu[sup 3+], which is attributed to the rearrangements of local environments surrounding the Eu[sup 3+] ions in the near surface of nanoparticles.

  • Tunnel junctions in a polymer composite. Paschen, S.; Bussac, M. N.; Zuppiroli, L.; Minder, E.; Hilti, B. // Journal of Applied Physics;9/1/1995, Vol. 78 Issue 5, p3230 

    Examines the charge transport mechanisms in polymer composite systems. Conduction of a transparent film of polycarbonate; Measurement of the current/voltage characteristics; Use of polycarbonate films containing microcrystals of charge-transfer complex.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics