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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na3Mn(BO3)2 by Materials Project

Na3Mn(BO3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to four O2- atoms to form distorted NaO4 trigonal pyramids that share corners with two NaO5 trigonal bipyramids, corners with three equivalent MnO5 trigonal bipyramids, and edges with two NaO5 trigonal bipyramids. There are a spread of Na–O bond distances ranging from 2.24–2.54 Å. In the second Na1+ site, Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with two equivalent NaO5 trigonal bipyramids, a cornercorner with one NaO4 trigonal pyramid, an edgeedge with one NaO5 trigonal bipyramid, edges with two equivalent MnO5 trigonal bipyramids, and an edgeedge with one NaO4 trigonal pyramid. There are a spread of Na–O bond distances ranging from 2.28–2.35 Å. In the third Na1+ site, Na1+ is bonded to five O2- atoms to form NaO5 trigonal bipyramids that share a cornercorner with one MnO5 trigonal bipyramid, corners with two equivalent NaO5 trigonal bipyramids, a cornercorner with one NaO4 trigonal pyramid, an edgeedge with one MnO5 trigonal bipyramid, edges with two NaO5 trigonal bipyramids, and an edgeedge with one NaO4 trigonal pyramid. There are a spread of Na–O bond distances ranging from 2.33–2.47 Å. Mn3+ is bonded to five O2- atoms to form MnO5 trigonal bipyramids that share a cornercorner with one NaO5 trigonal bipyramid, corners with three equivalent NaO4 trigonal pyramids, and edges with three NaO5 trigonal bipyramids. There are a spread of Mn–O bond distances ranging from 1.96–2.17 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.37–1.40 Å. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.37–1.41 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Mn3+, and one B3+ atom. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Na1+, one Mn3+, and one B3+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four Na1+ and one B3+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Mn3+, and one B3+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Mn3+, and one B3+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Mn3+, and one B3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3Mn by Materials Project

Na3Mn is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded to eight Na and four equivalent Mn atoms to form distorted NaNa8Mn4 cuboctahedra that share corners with twelve equivalent NaNa8Mn4 cuboctahedra, edges with eight equivalent NaNa8Mn4 cuboctahedra, edges with eight equivalent MnNa12 cuboctahedra, faces with four equivalent MnNa12 cuboctahedra, and faces with ten equivalent NaNa8Mn4 cuboctahedra. There are four shorter (3.37 Å) and four longer (3.50 Å) Na–Na bond lengths. All Na–Mn bond lengths are 3.50 Å. In the second Na site, Na is bonded in a distorted square co-planar geometry to eight equivalent Na and four equivalent Mn atoms. All Na–Mn bond lengths are 3.37 Å. Mn is bonded to twelve Na atoms to form MnNa12 cuboctahedra that share corners with four equivalent MnNa12 cuboctahedra, edges with eight equivalent MnNa12 cuboctahedra, edges with sixteen equivalent NaNa8Mn4 cuboctahedra, faces with four equivalent MnNa12 cuboctahedra, and faces with eight equivalent NaNa8Mn4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Evidence of Long-Range and Short-Range Magnetic Ordering in the Honeycomb Na 3 Mn 2 SbO 6 Oxide

We present a comprehensive study of the synthesis, structure, and magnetic properties of the honeycomb oxide Na 3 Mn 2 SbO 6 supported by neutron diffraction, heat capacity, and magnetization measurements. The refinements of the neutron diffraction patterns (150, 50, and 45 K) using the Rietveld method confirm the monoclinic (S. G. C2/m) structure. Temperature-dependent magnetic susceptibilities measured at varying fields along with the heat capacity measurements demonstrate the coexistence of long-range ordering (∼42 K) and short-range ordering (∼65 K). The field-dependent isothermal magnetization measurements at 5 K indicate a spin-flop transition around 5 T. Rietveld refinements of the low-temperature (below 45 K) neutron diffraction data further confirm the long-range magnetic ordering. In addition, the temperature variation of the lattice parameters obtained from the neutron powder diffraction analysis exhibited a distinct anomaly near the antiferromagnetic transition temperature. The appearance of the concomitant broadened backgrounds in the neutron powder diffraction data collected at 80, 50, and 45 K supports the short-range ordering. The resultant magnetic structure consists of spins that are aligned antiparallel with the nearest neighbors and also with the spins of the adjacent honeycomb layers. The occurrence of a fully ordered magnetic ground state (Neel antiferromagnetic (AFM)) in Na3Mn 2 SbO 6 consolidates the significance of fabricating new honeycomb oxides.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗