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采用同步辐射形貌术结合化学腐蚀法，系统研究了ＮＹＡＢ和ＮＧＡＢ晶体中的孪晶结构．已经发现：ＮＹＡＢ晶体中的孪晶为反演孪晶，主晶和孪晶结构具有互为中心对称关系；而ＮＧＡＢ晶体中的孪晶为１８０°旋转孪晶，孪晶结构由主晶结构绕结构的三次对称轴旋转１８０°而成
Synchrotron radiation topography combined with chemical etching was used to systematically study the twin structure in NYAB and NGAB crystals. It has been found that the twins in the NYAB crystal are inversion twins, the main crystal and the twin structure have centrosymmetric relationship with each other, while the twins in the NGAB crystal are 180 ° twins and the twin structure is surrounded by the main crystal structure The three symmetry axis of the structure is rotated by 180 °