Tm3Os is Cementite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Os(1) atoms. In the second Tm site, Tm(2) is bonded in a 3-coordinate geometry to three equivalent Os(1) atoms. Os(1) is bonded in a 8-coordinate geometry to two equivalent Tm(1) and six equivalent Tm(2) atoms.
Tm3Os is Cementite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Os(1) atoms. There is one shorter (2.69 Å) and one longer (2.79 Å) Tm(1)-Os(1) bond length. In the second Tm site, Tm(2) is bonded in a 3-coordinate geometry to three equivalent Os(1) atoms. There are a spread of Tm(2)-Os(1) bond distances ranging from 2.82-3.06 Å. Os(1) is bonded in a 8-coordinate geometry to two equivalent Tm(1) and six equivalent Tm(2) atoms.