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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ba2ErMoO6 by Materials Project

Ba2ErMoO6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ba2+ is bonded to twelve equivalent O2- atoms to form BaO12 cuboctahedra that share corners with twelve equivalent BaO12 cuboctahedra, faces with six equivalent BaO12 cuboctahedra, faces with four equivalent ErO6 octahedra, and faces with four equivalent MoO6 octahedra. All Ba–O bond lengths are 2.99 Å. Er3+ is bonded to six equivalent O2- atoms to form ErO6 octahedra that share corners with six equivalent MoO6 octahedra and faces with eight equivalent BaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Er–O bond lengths are 2.23 Å. Mo5+ is bonded to six equivalent O2- atoms to form MoO6 octahedra that share corners with six equivalent ErO6 octahedra and faces with eight equivalent BaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Mo–O bond lengths are 2.00 Å. O2- is bonded in a distorted linear geometry to four equivalent Ba2+, one Er3+, and one Mo5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba3Er2MoO9 by Materials Project

Ba3Er2MoO9 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form distorted BaO12 cuboctahedra that share corners with twelve BaO12 cuboctahedra, faces with six BaO12 cuboctahedra, faces with three equivalent MoO6 octahedra, and faces with five equivalent ErO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.80–3.22 Å. In the second Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with twelve BaO12 cuboctahedra, faces with six equivalent BaO12 cuboctahedra, faces with two equivalent MoO6 octahedra, and faces with six equivalent ErO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.84–3.23 Å. Er3+ is bonded to six O2- atoms to form ErO6 octahedra that share corners with three equivalent ErO6 octahedra, corners with three equivalent MoO6 octahedra, and faces with eight BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–14°. There are three shorter (2.15 Å) and three longer (2.34 Å) Er–O bond lengths. Mo6+ is bonded to six O2- atoms to form MoO6 octahedra that share corners with six equivalent ErO6 octahedra and faces with eight BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 1–12°. There is four shorter (1.96 Å) and two longer (1.97 Å) Mo–O bond length. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four Ba2+, one Er3+, and one Mo6+ atom. In the second O2- site, O2- is bonded in a distorted linear geometry to four Ba2+ and two equivalent Er3+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+ and two equivalent Er3+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+, one Er3+, and one Mo6+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+, one Er3+, and one Mo6+ atom.

36 MATERIALS SCIENCE↗