If the Electron beam direction is contained by the twinning plane, the TEM pattern shows characteristic satellite spots in the spot pattern of the sample (Refer attachment).It is clear from the spot pattern that the twin spots appear as mirror images across the 11 ̅1 / 1 ̅11 ̅ twinning plane. Till here it is correct. My doubt is why the 11 ̅1 ̅+ twin spot is not adjacent to 002 ̅ + twin spot or why the 1 ̅11 spot from the matrix is not adjacent to the 002 spot from the matrix? What determines the relative positions of the twin spot and the matrix spot?
The characteristic feature of the diffraction pattern of a twinned sample is due to the different orientations of the twin domains. This results in a splitting of the diffraction spot into two or more spots with different intensities and positions. This is because each twin domain contributes to the diffraction pattern with its own crystal orientation. The number and intensity of the twinned spots depend on the degree of twinning, and the crystal structure of the sample.
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