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首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >Electric Field Effect on NQR in Ferroelectric Materials
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Electric Field Effect on NQR in Ferroelectric Materials

机译：电场对铁电材料中NQR的影响

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摘要

The electric field effect on NQR in ferroelectric materials, ~(93)Nb in LiNbO_3 and ~(14)N in NaNO_2 and SC(NH_2)_2, has been investigated at 77 K. In these crystals with single domain, only the line shift due to the external electric field was observed. In the case of NaNO_2 powder and a crystal with multi-domains, line broadening was observed in the external electric field. These phenomena can be explained with the fact that the direction of spontaneous polarization in a domain is related to the direction of the applied electric field. The rate of the NQR line-shift due to the electric field is remarkably smaller in mostly ionic crystals, such as LiNbO_3 and NaNO_2, than in a molecular crystal such as SC(NH_2)_2. This is due to the strong ionic bonding in ionic crystals. Also, the difference of the Stark shift between NaNO_2 and SC(NH_2)_2 is discussed in terms of the local electric field and polarizability at the resonant nuclear site.
机译：在77 K下研究了电场对铁电材料中NQR，LiNbO_3中的〜（93）Nb和NaNO_2和SC（NH_2）_2中的〜（14）N的影响。在这些具有单畴的晶体中，仅存在线位移由于观察到外部电场。在NaNO_2粉末和具有多畴的晶体的情况下，在外部电场中观察到线展宽。这些现象可以通过以下事实来解释：域中的自发极化方向与所施加电场的方向有关。在大多数离子晶体（例如LiNbO_3和NaNO_2）中，由于电场引起的NQR线移速率明显小于在分子晶体（例如SC（NH_2）_2）中。这是由于离子晶体中的强离子键合所致。此外，从局部电场和共振核位点的极化率方面讨论了NaNO_2和SC（NH_2）_2之间的斯塔克位移差异。

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