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1999 (2)
1Author    E. Mikuli, A. Migdał-Mikuli, S. WróbelRequires cookie*
 Title    Phase Transitions in Crystalline [Me(H 2 0) 6 ](BF 4 ) 2 . Part I (Me = Mn, Fe, Co, Ni and Zn)  
 Abstract    Solid polymorphism in five compounds of the type [Me(H 2 0) 6 ](BF 4) 2 , where Me = Mn, Fe, Co, Ni and Zn, have been studied in the temperature range 120 -330 K by DSC. For each substance at least three solid modifications have been found. In addition, for compounds with Me = Mn, Fe and Zn some new low temperature phase transitions have been observed. The transition temperatures for the [Me(H 2 0) 6 ](BF 4) 2 compounds are distinctly lower than those for the [Me(H 2 0) 6 ](C10 4) 2 compounds. The entropy-and enthalpy-changes at the phase transitions of the hexaaquametal(II) tetrafluoroborates are significantly lower than those for the corresponding chlorates(VII). Linear correlations between the highest transition temperature and the crystal density are found for both series of these isomorphous compounds. 
  Reference    Z. Naturforsch. 54a, 225—228 (1999); received December 12 1998 
  Published    1999 
  Keywords    Hexaaquametal(II) tetrafluoroborates, Phase Transitions, DSC Method 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0225.pdf 
 Identifier    ZNA-1999-54a-0225 
 Volume    54 
2Author    E. Mikuli, A. Migdał-Mikuli, S. Wróbel, B. GradRequires cookie*
 Title    DSC Investigations of the Phase Transitions of [M(H 2 0) 6 ](N0 3 ) 2 , where M = Mn, Co, Ni, Cu and Zn  
 Abstract    The phase transitions of [M(H 2 0) 6 ](N0 3) 2 , where M = Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ or Zn 2+ have been studied at 100 -400 K by DSC. Two phase transitions connected with a two-stage melting process have been found for these five compounds. For the compound with M = Co, besides the two melting points a solid-solid phase transition at 272 K has been found. 
  Reference    Z. Naturforsch. 54a, 595—598 (1999); received August 13 1999 
  Published    1999 
  Keywords    Hexaaquametal(II) nitrates, Phase Transitions, Melting Points, DSC Method 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0595.pdf 
 Identifier    ZNA-1999-54a-0595 
 Volume    54