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DOE OSTI2020

Materials Data on MnCO3 by Materials Project

MnCO3 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. Mn2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Mn–O bond distances ranging from 2.13–2.29 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.29 Å) and one longer (1.31 Å) C–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Mn2+ and one C4+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Mn2+ and one C4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Mn2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnCo3 by Materials Project

Co3Mn is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mn is bonded to twelve equivalent Co atoms to form MnCo12 cuboctahedra that share corners with twelve equivalent MnCo12 cuboctahedra, edges with twenty-four equivalent CoMn4Co8 cuboctahedra, faces with six equivalent MnCo12 cuboctahedra, and faces with twelve equivalent CoMn4Co8 cuboctahedra. All Mn–Co bond lengths are 2.48 Å. Co is bonded to four equivalent Mn and eight equivalent Co atoms to form CoMn4Co8 cuboctahedra that share corners with twelve equivalent CoMn4Co8 cuboctahedra, edges with eight equivalent MnCo12 cuboctahedra, edges with sixteen equivalent CoMn4Co8 cuboctahedra, faces with four equivalent MnCo12 cuboctahedra, and faces with fourteen equivalent CoMn4Co8 cuboctahedra. All Co–Co bond lengths are 2.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnCo3 by Materials Project

Co3Mn is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Mn is bonded to twelve equivalent Co atoms to form MnCo12 cuboctahedra that share corners with six equivalent MnCo12 cuboctahedra, corners with twelve equivalent CoMn4Co8 cuboctahedra, edges with eighteen equivalent CoMn4Co8 cuboctahedra, faces with eight equivalent MnCo12 cuboctahedra, and faces with twelve equivalent CoMn4Co8 cuboctahedra. There are six shorter (2.43 Å) and six longer (2.47 Å) Mn–Co bond lengths. Co is bonded to four equivalent Mn and eight equivalent Co atoms to form distorted CoMn4Co8 cuboctahedra that share corners with four equivalent MnCo12 cuboctahedra, corners with fourteen equivalent CoMn4Co8 cuboctahedra, edges with six equivalent MnCo12 cuboctahedra, edges with twelve equivalent CoMn4Co8 cuboctahedra, faces with four equivalent MnCo12 cuboctahedra, and faces with sixteen equivalent CoMn4Co8 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.44–2.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2026

High waste loading glass formulation development for High-Mn HLW

One of the primary objectives of the work described herein was to develop and identify HLW glass compositions and glass forming additive blends that achieve high waste loadings and processing rates for high manganese HLW streams while maintaining acceptable glass properties. Another objective was to determine the effect of the form of manganese (MnO, MnO2, MnCO3) on feed processing properties, glass production rates, and product quality while vitrifying a high manganese HLW stream. This was accomplished through a combination of crucible-scale tests, vertical gradient furnace tests, and confirmation tests on a DM100 melter system.

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗