Materials Data on BaTbAgTe3 by Materials Project
BaTbAgTe3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to eight Te2- atoms. There are a spread of Ba–Te bond distances ranging from 3.50–3.91 Å. Tb3+ is bonded to six Te2- atoms to form TbTe6 octahedra that share corners with two equivalent TbTe6 octahedra, edges with two equivalent TbTe6 octahedra, and edges with four equivalent AgTe4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. There are two shorter (3.13 Å) and four longer (3.16 Å) Tb–Te bond lengths. Ag1+ is bonded to four Te2- atoms to form AgTe4 tetrahedra that share corners with two equivalent AgTe4 tetrahedra and edges with four equivalent TbTe6 octahedra. There are two shorter (2.81 Å) and two longer (2.83 Å) Ag–Te bond lengths. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 6-coordinate geometry to three equivalent Ba2+, two equivalent Tb3+, and one Ag1+ atom. In the second Te2- site, Te2- is bonded to two equivalent Ba2+, two equivalent Tb3+, and two equivalent Ag1+ atoms to form a mixture of distorted edge and corner-sharing TeBa2Tb2Ag2 octahedra. The corner-sharing octahedral tilt angles are 0°.