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A series of tribromogermanate(II) complexes RGeBr 3  (R = CH 3 NH 3 , (CH 3 ) 2 NH 2 , (CH 3 ) 4 N, C 2 H 5 NH 3 , (C 2 H 5 ) 4 N) have been synthesized and characterized by  81 Br NQR, AC conductivity, DTA, and X-rax diffraction. These measurements revealed the presence of successive phase transitions in these complexes. The crystal structures of Phases I and II in (NH 3 ) 4 NGeBr 3  were derived from the Rietveld analysis of powder X-ray diffraction. The electric conductivity was considerably high in CH 3 NH 3 GeBr 3  and (NH 3 ) 4 NGeBr 3 . The conduction mechanism is discussed on the basis of  81 Br NQR spin-lattice relaxation times and crystal structures.

Structure and Successive Phase Transitions of RGeBr 3 (R = Alkylammonium) Studied by Means of NQR