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1994 (1)
1Author    K. Yamada, K. Isobe, T. Okuda, Y. FurukawaRequires cookie*
 Title    Successive Phase Transitions and High Ionic Conductivity of Trichlorogermanate (II) Salts as Studied by 35C1 NQR and Powder X-Ray Diffraction  
 Abstract    A series o f trichlorogermanate(II) salts (AG eCl3, A = Rb, Cs, C H 3N H 3, and (C H 3)4N) have been synthesized and characterized by 35C1 N Q R , 35C1 N M R , AC conductivity, DTA, and X-ray diffrac­ tion techniques. In the temperature range studied two, two, five, and four phases were confirmed for the Rb, Cs, C H 3N H 3, and (C H 3)4N salts, respectively. From the 35C1 N Q R and structural data, isolated pyramidal G eC l3 anions were recognized in the low temperature phases. With increasing temperature the relaxation times of the 35C1 N Q R decreased exponentially and the signals disap­ peared far below the melting point. This suggests that the reorientation of the anion about the pseudo three-fold axis is excited. With further increase in temperature, the ionic conductivity of C H 3N H 3G eC l3 and (C H 3)4N G eC l3 increased drastically at the phase transitions to their cubic perovskite phases (C H 3N H 3G eC l3: a = 10-1 S m -1 at 400 K, (C H 3)4N G eC l3: a = 5 x 10-2 S m _1 at 420 K). The mobile ion was confirmed to be the chloride ion by means of 35C1 N M R and X-ray diffraction. 
  Reference    Z. Naturforsch. 49a, 258 (1994); received July 23 1993 
  Published    1994 
  Keywords    35C1 N Q R, 35C1 N M R, Ionic conductivity, Rietveld analysis, Phase transition 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0258.pdf 
 Identifier    ZNA-1994-49a-0258 
 Volume    49