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利用X射线衍射形貌法,研究了五磷酸钕(NdP5O14)晶体中铁弹畴界的衍射衬度。发现在μt=0.6—7范围内,畴界呈现黑的或白的衬度。畴界衍射衬度的特征可归结为(c2-c1=)△c∥g畴界衬度明显△c⊥g畴界衬度消失△c·g>0畴界呈黑衬度△c·g<0畴界呈白衬度利用Penuing-Polder波点迁移原理,对畴界的衬度形成原理做了定性解释。根据畴界的衍射衬度特征,定性讨论了畴界的结构特征。The ferroelastic domain walls in NdP5O14 crystals have been studied by means of X-ray fopography. It has been found that the ferroelastic domain walls appear to be black or white contrast in X-ray fopograph in the range of μt=0.6—7. The feature of the diffraction contrast of the ferroelastic domain walls is summarized as follows: (C2 - C1 = )△C//g contrast of the ferroelastic domain wall is strong △C⊥g contrast of the ferroelastic domain wall is invisible △C·g > 0 contrast of the ferroelastic domain wall appears to be black △C·g < 0 contrast of the ferroelastic domain wall appears to be white The diffraction contrast of the ferroelastic domain wall has been explained qualitatively by Penning-Polder's theory. According to the feature of the diffraction contrast, the structural characteristics of the ferroelastic domain wall has been discussed.
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