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JKMRS Volume 17, No 1 19-23; Molecular Dynamics in Paraelectri...
2013년 06월 20일 / 조회수: 516

Molecular Dynamics in Paraelectric Phase of KH2PO4 Crystals Studied by Single Crystal NMR and MAS NMR

 

 

Younkee Paik1* and Celesta L. Chang2

 

 

1Daegu Center, Korea Basic Science Institute, Daegu 702-701, Korea

2 Department of Physics, Yonsei University, Seoul 120-749, Korea

 

 

Received April 5, 2013; Revised June 04, 2013; Accepted June 10, 2013

 


Abstract   The temperature dependences of the NMR spectrum and the spin-lattice relaxation times in KH­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­2PO­4 wer­e investigated via single-crystal NMR and MAS NMR. The stretched-exponential relaxation that occurred because of the distribution of correlation times was indicative of the degree of the distribution of the double-well potential on the hydrogen bond. The behaviors responsible for the strong temperature dependences of the 1H and 31P spin-lattice relaxation times in the rotating frame T in KH2PO4 are likely related to the reorientational motion of the hydrogen-bond geometry and the PO4 tetrahedral distortion.

 

Keywords   NMR, CP/MAS NMR, Crystal growth, Phase transition, Ferroelctrics

 

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