Abstract
The twin structure of a ferroelastic CsPbCl 3 single crystal grown by the Bridgman method has been investigated using 133Cs nuclear magnetic resonance. Owing to the quadrupole interaction of the 133Cs ( I=7/2) nucleus in CsPbCl 3 crystal, two sets of seven-line structures were obtained, instead of a simple seven-line structure. From the experimental data, the quadrupole coupling constant, e 2 qQ/ h, and the asymmetry parameter, η, for the resonance lines of two sets were determined. However, the two parameters were found to be same. The principal axes X, Y, and Z of the EFG tensor for the 133Cs were found to lie along the crystallographic c-, a- and b-axes for one set, while the Y and Z axes were interchanged for the other. This indicates that the CsPbCl 3 crystal has characteristics of a twin structure crystal. Therefore, the domain wall makes an angle of 45° with respect to the [100] axis; we observed the ferroelastic domain with respect to the prominent W wall.
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