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1993 (2)
1Author    R. Jakubas, G. Bator, M. Foulon, J. Lefebvre, J. MatuszewskiRequires cookie*
 Title    Structural Phase Transitions in (/i-C 3 H 7 NH3) 2 SbBr 5  
 Abstract    Dielectric, DSC, thermal expansion and preliminary X-ray diffraction studies on (/i-C 3 H 7 NH3) 2 SbBr 5 are reported. It was found that this crystal undergoes a complex sequence of phase transitions. On cooling: phase I phase II at 188.7 K (continuous), II -» • III at 165 K (1st order, z!S = 26.8 J/mol K), III IV at 137 K (1st order, 1.6 J/mol K). On heating: IV III at 154 K, III II' at 168 K, II' -> II at 177 K (1st order, 2.8 J/mol K), II I at 189 K. All 1st order phase transitions are likely due to the motion of the n-C 3 H 7 NH3 cations. The dielectric dispersion studies between 100 Hz-1 MHz within the phases I and II indicate a fast reorientational motion of dipoles with T < 10" 7 s. 
  Reference    Z. Naturforsch. 48a, 529—534 (1993); received October 7 1992 
  Published    1993 
  Keywords    Alkylammonium halogenoantimonates, Phase transition, Dielectric, DSC, Thermal expansion 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0529.pdf 
 Identifier    ZNA-1993-48a-0529 
 Volume    48 
2Author    W. Medycki, R. Jakubas, N. Piślewski, J. LefebvreRequires cookie*
 Title    NMR and Dilatometric Studies on [N(CH 3 ) 4 1 3 M 2 X 9 (M = Sb, Bi; X = C1, Br)  
 Abstract    Thermal expansion studies on [N(CH 3) 4 ] 3 Sb-,Cl 9 and [N(CH 3) 4 ] 3 Sb 2 Br 9 are reported. The relax-ation times 'H T, were measured for [N(CH 3) 4 ] 3 Bi 2 Cl 9 , [N(CH 3) 4 ] 3 Sb 2 Br 9 , and [N(CH 3) 4 ] 3 Bi 2 Br 9 in the temperature range 100-290 K. To interpret the 7\ data on [N(CH 3) 4 ] 3 Bi 2 Cl 9 the method of Tj calculation reported by Takeda et al. has been applied successfully. Two different, inequivalent types of [N(CH 3) 4 ] 3 cations for all tetramethylammonium crystals are found. 
  Reference    Z. Naturforsch. 48a, 748—752 (1993); received January 31 1993 
  Published    1993 
  Keywords    Tetramethylammonium crystals, Phase transitions, Thermal expansion, 'H spin-lattice relaxation time 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0748.pdf 
 Identifier    ZNA-1993-48a-0748 
 Volume    48