Orthorhombic charge density wave on the tetragonal lattice of EuAl.

EuAl possesses the BaAl crystal structure type with tetragonal symmetry 4/. It undergoes a charge density wave (CDW) transition at  = 145 K and features four consecutive antiferromagnetic phase transitions below 16 K. Here we use single-crystal X-ray diffraction to determine the incommensurately modulated crystal structure of EuAl in its CDW state.

Boranes: The Boron Subhydride BH with a Distorted β-Boron Crystal Structure.

A single crystal of the boron subhydride BH was serendipitously obtained while attempting to synthesize β-boron. An accurate crystal structure analysis revealed a distorted β-boron framework with the noncentrosymmetric space group 3. We have found one interstitial site occupied by boron.