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25 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Dy(MnSn)6 by Materials Project

DyMn6Sn6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Dy is bonded to eight Sn atoms to form distorted edge-sharing DySn8 hexagonal bipyramids. There are two shorter (3.00 Å) and six longer (3.15 Å) Dy–Sn bond lengths. Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.74–2.83 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 12-coordinate geometry to three equivalent Dy and six equivalent Mn atoms. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Mn atoms. In the third Sn site, Sn is bonded in a 8-coordinate geometry to one Dy, six equivalent Mn, and one Sn atom. The Sn–Sn bond length is 3.01 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(MnSn)6 by Materials Project

SmMn6Sn6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Sm is bonded to eight Sn atoms to form distorted edge-sharing SmSn8 hexagonal bipyramids. There are two shorter (3.03 Å) and six longer (3.16 Å) Sm–Sn bond lengths. Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.75–2.84 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 12-coordinate geometry to three equivalent Sm and six equivalent Mn atoms. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Mn atoms. In the third Sn site, Sn is bonded in a 8-coordinate geometry to one Sm, six equivalent Mn, and one Sn atom. The Sn–Sn bond length is 2.99 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(MnSn)6 by Materials Project

ErMn6Sn6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Er is bonded to eight Sn atoms to form distorted edge-sharing ErSn8 hexagonal bipyramids. There are two shorter (3.00 Å) and six longer (3.15 Å) Er–Sn bond lengths. Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.74–2.83 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 12-coordinate geometry to three equivalent Er and six equivalent Mn atoms. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Mn atoms. In the third Sn site, Sn is bonded in a 8-coordinate geometry to one Er, six equivalent Mn, and one Sn atom. The Sn–Sn bond length is 3.00 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(MnSn)6 by Materials Project

SmMn6Sn6 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded to eight Sn atoms to form distorted edge-sharing SmSn8 hexagonal bipyramids. There are a spread of Sm–Sn bond distances ranging from 3.02–3.20 Å. In the second Sm site, Sm is bonded to eight Sn atoms to form distorted edge-sharing SmSn8 hexagonal bipyramids. There are a spread of Sm–Sn bond distances ranging from 3.02–3.18 Å. There are four inequivalent Mn sites. In the first Mn site, Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are four shorter (2.76 Å) and two longer (2.85 Å) Mn–Sn bond lengths. In the second Mn site, Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.75–2.85 Å. In the third Mn site, Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.72–2.85 Å. In the fourth Mn site, Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.75–2.84 Å. There are nine inequivalent Sn sites. In the first Sn site, Sn is bonded in a 8-coordinate geometry to one Sm, six Mn, and one Sn atom. The Sn–Sm bond length is 3.02 Å. There are four shorter (2.84 Å) and two longer (2.85 Å) Sn–Mn bond lengths. The Sn–Sn bond length is 3.01 Å. In the second Sn site, Sn is bonded in a 12-coordinate geometry to three Sm and six Mn atoms. In the third Sn site, Sn is bonded in a 6-coordinate geometry to six Mn atoms. In the fourth Sn site, Sn is bonded in a 12-coordinate geometry to three Sm and six Mn atoms. In the fifth Sn site, Sn is bonded in a 6-coordinate geometry to six Mn atoms. In the sixth Sn site, Sn is bonded in a 8-coordinate geometry to two equivalent Sm and six Mn atoms. In the seventh Sn site, Sn is bonded in a 7-coordinate geometry to one Sm and six Mn atoms. In the eighth Sn site, Sn is bonded in a 8-coordinate geometry to one Sm, six Mn, and one Sn atom. The Sn–Sn bond length is 3.01 Å. In the ninth Sn site, Sn is bonded in a 8-coordinate geometry to one Sm, six Mn, and one Sn atom. The Sn–Sn bond length is 3.01 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(MnSn)6 by Materials Project

LuMn6Sn6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Lu is bonded to eight Sn atoms to form distorted edge-sharing LuSn8 hexagonal bipyramids. There are two shorter (2.98 Å) and six longer (3.14 Å) Lu–Sn bond lengths. Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.73–2.82 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 12-coordinate geometry to three equivalent Lu and six equivalent Mn atoms. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Mn atoms. In the third Sn site, Sn is bonded in a 8-coordinate geometry to one Lu, six equivalent Mn, and one Sn atom. The Sn–Sn bond length is 3.03 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg(MnSn)6 by Materials Project

MgMn6Sn6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Mg is bonded to eight Sn atoms to form edge-sharing MgSn8 hexagonal bipyramids. There are two shorter (2.93 Å) and six longer (3.14 Å) Mg–Sn bond lengths. Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.74–2.81 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 7-coordinate geometry to one Mg and six equivalent Mn atoms. In the second Sn site, Sn is bonded in a 12-coordinate geometry to three equivalent Mg and six equivalent Mn atoms. In the third Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Mn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Understanding magnetic phase coexistence in Ru 2 Mn 1-x Fe x Sn Heusler alloys: A neutron scattering, thermodynamic, and phenomenological analysis

The random substitutional solid solution between the antiferromagnetic (AFM) full-Heusler alloy Ru 2 MnSn and the ferromagnetic (FM) full-Heusler alloy Ru 2 FeSn provides a rare opportunity to study FM-AFM phase competition in a near-lattice-matched, cubic system, with full solubility. At intermediate x in Ru 2 Mn 1-x Fe x Sn this system displays suppressed magnetic ordering temperatures, spatially coexisting FM and AFM order, and strong coercivity enhancement, despite rigorous chemical homogeneity. Here, we construct the most detailed temperature- and x-dependent understanding of the magnetic phase competition and coexistence in this system to date, combining wide-temperature-range neutron diffraction and small-angle neutron scattering with magnetometry and specific heat measurements on thoroughly characterized polycrystals. A complete magnetic phase diagram is generated, showing FM-AFM coexistence between x ≈ 0.30 and x ≈ 0.70. Furthermore, important insight is gained from the extracted length scales for magnetic phase coexistence (25–100 nm), the relative magnetic volume fractions and ordering temperatures, and remarkable x-dependent trends in magnetic and electronic contributions to specific heat. An unusual feature in the magnetic phase diagram (an intermediate FM phase) is also shown to arise from an extrinsic effect related to a minor Ru-rich secondary phase. The established magnetic phase diagram is then discussed with the aid of phenomenological modeling, clarifying the nature of the mesoscale phase coexistence with respect to the understanding of disordered Heisenberg models.

36 MATERIALS SCIENCE↗