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1986 (1)
1Author    Z. NaturforschRequires cookie*
 Title    An ESR Study of Structural Phase Transitions o f(N H ,)2Pb|C u(N 02)6|  
 Abstract    T etsuo Asaji, Laxm an S hrikrishna P ra b h u m irash i *, and D aiy u N ak a m u ra The structural changes o f (N H 4) 2P b [C u (N 0 2)6] crystals during the phase transitions at 316, 287, and 95 K were studied by means o f a single crystal ESR technique. Anisotropic g values [9 > 9±) were obtained in the lowest temperature phase IV, whereas the ESR spectra recorded in the intermediate phases III and II, in which the crystal is known to be tetragonally compressed along the c axis, could be interpreted by use o f effective g values [g (c) < g (_L c)]. In the highest temperature phase I an isotropic g value was obtained. The phases I, II, and III o f the present complex can be assumed to be very similar to the corresponding phases observed above ~ 250 K for the com pounds R2P b [C u (N 0 2) 6] with R = K, Rb, Cs, and Tl. However, the lowest temperature phase transition transforms the phase III with an antiferrodistortive order o f the elongated [C u (N 0 2)6]4_ octahedra into the phase IV with a ferrodistortive one. This occurs only for the complex with R = N H 4 and is very unusual. The results o f the 14N N Q R experiments already reported for the phases III and IV could be well explained by the present newly proposed model. 
  Reference    Z. Naturforsch. 41a, 1154—1158 (1986); received May 3 1986 
  Published    1986 
  Keywords    Magnetic Resonance (ESR, N Q R ), Phase Transition, Crystal Structure 
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 TEI-XML for    default:Reihe_A/41/ZNA-1986-41a-1154.pdf 
 Identifier    ZNA-1986-41a-1154 
 Volume    41