Go toArchive
Browse byFacets
Bookbag ( 0 )
'Liquid Crystal Smectic A' in keywords
Results  1 Item
Sorted by   
Section
Publication Year
1999 (1)
1Author    Stanislaw Urban, Albert WürflingerRequires cookie*
 Title    High Pressure Dielectric Studies of a Substance with the Smectic A 1 Phase  
 Abstract    The results of dielectric studies of 5-n-hexyl-2-(4'-isothiocyanato)-l,3-dioxane (6DBT) in the smec-tic A, phase at pressures up to 150 MPa and temperatures up to 340 K are presented. The low frequen-cy relaxation time T\\ (/?, T) yields the activation volume A # V|| = RT(d ln Tjj/9/>) r and activation enthal-py A # //jj = R(d ln T||/37) p . The calculated values of these parameters are compared with those ob-tained recently for n-octyl-cyanobiphenyl (8CB) forming the smectic A d phase. In the case of 6DBT both these quantities are practically constant, whereas those for 8CB decrease, when going away from the phase transitions isotropic -smectic A] (6DBT) or nematic -smectic A d (8CB). These differences support our earlier conclusion that increase of pressure leads to a breaking of the antiparallel associa-tions of cyanobiphenyl molecules in the smectic as well as in the nematic phases. 
  Reference    Z. Naturforsch. 54a, 455—458 (1999); received July 12 1999 
  Published    1999 
  Keywords    Liquid Crystal; Smectic A, Dielectric Properties, High Pressure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0455.pdf 
 Identifier    ZNA-1999-54a-0455 
 Volume    54