The complex superstructure in Mg1-xAlxB2 at x~0.5

Details The complex superstructure in Mg1-xAlxB2 at x~0.5 The complex superstructure in Mg1-xAlxB2 at x~0.5

2001-09-17

arxiv.org/abs/cond-mat/0109301v1

Physics

Condensed Matter

Scientific paper

10.1016/S0921-4534(01)01195-9

Electron diffraction and high resolution microscopy have been performed on Mg1-xAlxB2 with x~0.5. This composition displays a superstructure with a repeat period of exactly 2c along the c axis and about 10 nm in the a-b plane. The superstructure results in ring-shaped superreflections in the diffraction pattern. Irradiation by a strong electron beam results in a loss of the superstructure and a decrease of about 1% in the c lattice parameter. In-situ heating and cooling on the other hand showed that the superstructure is stable from 100 K to 700 K. Possible origins for the superstructure are proposed.

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