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'Alkylammonium halogenoantimonates' in keywords
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1993 (1)
1989 (1)
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    R. Zaleski, Z. Jakubas, L. Galewski, SobczykRequires cookie*
 Abstract    Dielectric. DSC and preliminary X-ray diffraction studies on [(C2H5)4N]3Sb2Br9 (TEABA) and [(C2H5)4N]3Bi2Br9 (TEABB) are reported. The compounds are isomorphous, space group P6322. The static electric permittivity measurements on single crystals in the temperature range 220 290 K revealed that both compounds show two distinct dielectric anomalies; TEABA at Tcl = 258 K and Tc2 = 252 K, while TEABB at Tcl= 265 K and Tcl = 248 K. The DSC studies show only one anomaly of first order at TcX =258 K for TEABA, and TcX =266 K for TEABB. These transitions are pre­ sumably related to a freezing of the reorientational motion of the tetraethylammonium cations. S tr u c tu r a l P h a s e T ra n s itio n s in |(C 2H 5)4N ] 3S b 2B r 9 a n d |(C 2H 5) 4N |3B i2B r 9 
  Reference    Z. Naturforsch. 44a, 1102 (1989); received May 11 1989 
  Published    1989 
  Keywords    Alkylammonium halogenoantimonates, Bismuthates, Phase transition Dielectric, DSC, Single crystals 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-1102.pdf 
 Identifier    ZNA-1989-44a-1102 
 Volume    44