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1995 (1)
1994 (1)
1Author    Motoko Kenmotsu, Hisashi Honda, Hiroshi Ohki, Ryuichi Ikeda, Tomoki Erata, Akira Tasaki, Yoshihiro FurukawaRequires cookie*
 Title    Ionic Dynamics in Plastic Crystal KNOz Studied by 39K and I5NNMR  
 Abstract    The spin-lattice relaxation time of 39K N M R observed in the low-temperature phase (T <264.1 K) of K N 0 2 is explained by the quadrupole mechanism contributed from a newly found N O J m otion. The in-plane C 3 reorientation and the overvall N 0 2 rotation as well as the self-diffusion were shown in the intermediate phase (T < 314.7 K) and the high-temperature plastic phase (T < melting point: 710 K), respectively, by observing 39K and 15N N M R relaxation times and 1SN lineshapes. 
  Reference    Z. Naturforsch. 49a, 247 (1994); received July 23 1993 
  Published    1994 
  Keywords    K e y words: Solid NM R, Q uadrupole relaxation, Plastic crystal, Phase transition, Chemical shift anisotropy 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0247.pdf 
 Identifier    ZNA-1994-49a-0247 
 Volume    49 
2Author    Hisashi Honda, Shin'. Ichi Ishimaru, Noriko Onoda-Yamamuro, Ryuichi IkedaRequires cookie*
 Abstract    y n a m ic s o f N i t r i te I o n s in th e I o n ic P la s tic C r y s ta l T IN O 2 s tu d ie d b y 15N a n d 205T1 N The temperature dependences of the NMR spin-lattice and spin-spin relaxation times and the NMR spectra of 15N in T115N02 were observed in the plastic phase (282.4 K < T < 459 K) and the low-temperature phase. From the analysis of 15N NMR data, we attributed the motion reported in dielectric and TI NMR studies in the low-temperature phase to the 180°-flip of NO^~ ions which takes place with an activation energy of 14 kJ mol-1. In the plastic phase, we detected isotropic NOJ reorientation with an activation energy of 13.5 kJ mol-1 and a new anionic motion with 10 kJ mol-1. 
  Reference    Z. Naturforsch. 50a, 871—875 (1995); received June 16 1995 
  Published    1995 
  Keywords    Solid NMR, Spin-lattice relaxation, Plastic crystal, Phase transition, Chemical shift anisotropy 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0871.pdf 
 Identifier    ZNA-1995-50a-0871 
 Volume    50