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1995 (1)
1994 (1)
1Author    J. Zaleski, R. JakubasRequires cookie*
 Title    The Dielectric and Dilatometric Single Crystal Studies of Phase Transitions in a New Member of Family of Halogenoantimonates(III) [C(NH2)3l2SbCl5* [C(NH2)3]C1  
 Abstract    The results of dielectric, dilatometric and DSC studies on a new member of the family of alkylammonium halogenoantimonates ([(C(NH2)3]2SbCl5 • [(C(NH2)3]C1) are presented. This com­ pound undergoes three phase transitions at 146 K, 162 K, and 366 K. The two low temperature transitions are suggested to be of the displacive type and the high temperature one of the order-dis-order type. The character of temperature changes of the electric permittivity at the lowest temper­ ature transition suggest a polar phase below the transition temperature. 
  Reference    Z. Naturforsch. 49a, 709—713 (1994); received March 23 1994 
  Published    1994 
  Keywords    Phase transitions, Dielectric, Dilatometric, Halogenoantimonate, Guanidinium 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0709.pdf 
 Identifier    ZNA-1994-49a-0709 
 Volume    49 
2Author    G. H., C. A., J. Zaleskia, G. Batorb, R. JakubasbRequires cookie*
 Abstract    ie le c tr ic P r o p e r tie s a n d C h a r a c te r is a tio n o f th e S u p e rio n ic P h a s e o f [ C (N H 2) 3]2S b C l 5* [ C (N H 2) 3]C l (GHCA undergoes four phase transitions at Tcl = 402 K, Tc2 = 373 K, Ta = 162 K, and TcA = 146 K. Below Tc3 it possesses pyroelectric properties with the spontaneous polarization vector (Ps) in the ac plane and the maximum along the c axis equal to 8 pC/m2. Dielectric dispersion studies of GHCA show that the main dielectric dispersion connected probably with collective motions of chlorine ions is above 1GHz. For the phase transition at Tc2 to a superionic phase the thermal dilatation and electric conductivity were measured. The anomalies of the electric conductivity at Tc2 and T x were observed with large values of <j(10"3 S/m) above Tcl. The guanidinium cations above Tc2, besides reorientational motions, undergo slow self diffusion. 
  Reference    Z. Naturforsch. 50a, 888—892 (1995); received February 20 1995 
  Published    1995 
  Keywords    Guanidinium, chloroantimonate, phase transition, DSC, dilatometric, pyroelectric, electric conductivity 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0888.pdf 
 Identifier    ZNA-1995-50a-0888 
 Volume    50