For La_1-xNd_xGaO₃ crystals the La-Nd substitution leads to decrease of spontaneous strains and for composition with x>>0.32 the six possible twin states of orthorhombic phase (m3mFmmm) may be degenerated in three twin states inhered in m3mF4/mmm species when a distorted perovskite pseudocell becomes tetragonal. The {110} and {112} reflection twins and axial twins with compositional planes close to (211) and (21-1) (S-walls) were identified in La_1-xNd_xGaO₃ (x=0.07, 0.12, 0.20) solid solutions crystals. All observed twins are typical for crystals with GdFeO₃ type perovskite-like structure. It has been shown that for x<=0.2 and x>=0.5 orientations of S-walls weakly depend on La/Nd ratio, whereas in the range of 0.2<x<0.5 they depend strongly on the solid solution composition. The tilt angle between two twin states across twin boundary in La_1-xNd_xGaO₃ (x<0.6) solid solutions is smaller than that between two twins in pure LaGaO₃ or NdGaO₃.

Keywords: twin, (La,Nd)GaO3, perovskite, Czochralski technique

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