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1977 (1)
1976 (1)
1Author    J. Pebler, K. Schmidt, H. WasinskiRequires cookie*
 Title    Untersuchung des M2/M3-Phasenübergangs in Vi^Fe^Oa mit x = 0,024 Investigation of the M2/M3 Phase Transition in Vj^Fe^Og with x = 0.024  
 Abstract    Phase The Mössbauer investigations of Vi__!.Fea.02 with x = 0.024 indicate that Fe enters two cation positions of M2 and M3. At the phase transition the two quadrupole splittings show a discontinuous behavior whereas the isomer shift changes continuously with a crossing-over at the M2, M3 transition (Tt, = 275 K). Generally a first order phase transition is accompanied by a change of the cell volume V and a change of the isomer shift. The ob-served continuous behavior of the isomer shift points to a first order transition with 8V + 0. 
  Reference    (Z. Naturforsch. 31b, 1367—1371 [1976]; eingegangen am 5. Juli 1976) 
  Published    1976 
  Keywords    Transition, Field Gradient, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1367.pdf 
 Identifier    ZNB-1976-31b-1367 
 Volume    31 
2Author    Requires cookie*
 Title    Mössbauer-spektroskopische Untersuchungen an Na2MnFeF7  
 Abstract    Mössbauer Spectroscopic Investigation of N a2M nFeF7 J . P e b l e r , K. S c h m i d t , D. B a b e l und W. V e r s c h a r e n In contrast to the Mössbauer spectrum of the orthorhombic compound Na2N iF eF 7 that of the manganous compound Na2MnFeF7 gives evidence of two different iron positions. This rules out Na^MnFeF? to be isostructural with N a2N iF eF 7 , which crystallizes like most compounds Na2MHMin F 7 in the weberite structure, the M111 ions occupying only one site in space group Im m 2-C |°. The Mössbauer data evaluated for the two iron sites (Fe 1 /Fe 2 respectively) in Na2MnFeF7 are: 0 = 0/90°, cp = undetermined/700, rj — 0.6 both, H = 551/541 kOe, Vzz = + 2 .7 • 1018 Vcm-2 both. NaMnFeF7 is antiferromagnetic with a Neel temperature of Tn — 94 K for both iron positions. 
  Reference    (Z. Naturforsch. 32b, 369—372 [1977]; eingegangen am 27. Dezember 1976) 
  Published    1977 
  Keywords    Mössbauer Spectra, Internal Field, Field Gradient 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0369.pdf 
 Identifier    ZNB-1977-32b-0369 
 Volume    32