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'Phase Transition' in keywords Facet   section ZfN Section B:Volume 030  [X]
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1975 (1)
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 Title    Spectroscopic Behaviour of Quasi-One-Dimensional Linear Chains in MgPt(CN)4 * 7 H ,0 Single Crystals  
 Abstract    H a r t m u t Y e r s i n a n d G ü n t e r G l i e m a n n In stitu t In the direction of the crystallographic c-axis MgPt(CN)4 • 7 H 20 has a relatively low P t-P t-distance (3.15 A at 300 °K). Thus the optical behaviour shows inter-molecular interactions. Single crystal polarized emission and absorption spectra were measured between 300 °K and 5 °K. In this tem perature range the emission peaks shift to the red by about 1,100 cm-1. This is attributed to a decrease in Pt-Pt-distance. MgPt(CN)4 • 7 H 20 undergoes phase transitions at about 166 °K and 60 °K. To interprete the solid state emission and absorption behaviour the Davydov theory is applied. The two lowest excited bands of electronic origin are assigned to the symmetries r ^ f k) and r ^ u(k) in the double group Dgh. 
  Reference    (Z. Naturforsch. 30b, 183—190 [1975]; received December 27 1974) 
  Published    1975 
  Keywords    Electronic Spectra, Phase Transitions, Davydov Splitting 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0183.pdf 
 Identifier    ZNB-1975-30b-0183 
 Volume    30