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Specific heat, X-ray diffraction and electron diffraction experiments at low temperatures have clearly shown that the Cd 6 Yb and Cd 6 Ca crystals, which are 1/1 cubic approximants at room temperature, undergo an order–disorder transition at 110 and 100 K, respectively. The transition is reasonably attributed to the orientational ordering of 4Cd tetrahedra located at the center of...
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