Samarium tetraboride is a binary inorganic compound of samarium and boron with the formula SmB4. It forms black crystals.
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| Names | |
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| IUPAC name
Samarium tetraboride
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| Identifiers | |
3D model (JSmol)
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| Properties | |
| SmB4 | |
| Molar mass | 193.60 g/mol |
| Density | 6.1 g/cm3 |
| Melting point | 2,400 °C (4,350 °F; 2,670 K) |
| Related compounds | |
Related compounds
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Samarium hexaboride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
editSamarium tetraboride can be prepared from directly reacting samarium and boron at 2400 °C:
- Sm + 4B → SmB4
Physical properties
editSamarium tetraboride forms crystals of the orthorhombic crystal system, space group P4/mbm, cell parameters a = 0.7174 nm, c = 0.40696 nm, Z = 4, and a structure like thorium tetraboride.[1][2][3][4][5]
The compound is formed by a peritectic reaction at a temperature of 2400 °C.[1]
At temperatures of 25 K and 7 K, magnetic transitions occur in the compound.[6]
References
edit- ^ a b Диаграммы состояния двойных металлических систем. Vol. 1. М.: Машиностроение. 1996. ISBN 5-217-02688-X.
{{cite book}}: Unknown parameter|agency=ignored (help) - ^ Самсонов Г.В., Серебрякова Т.И., Неронов В.А. (1975). Бориды. М.: Атомиздат.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ Predel, B. (2012), Predel, B. (ed.), "B - Sm (Boron - Samarium): phase equilibria, crystallographic and thermodynamic data of binary alloys", B - Ba … Cu - Zr, vol. 12B, Berlin, Heidelberg: Springer Berlin Heidelberg, p. 73, doi:10.1007/978-3-540-44756-6_37, ISBN 978-3-540-44753-5, retrieved 2024-05-15
- ^ Predel, B. (1992), Madelung, O. (ed.), "B-Sm (Boron-Samarium)", B-Ba – C-Zr, Landolt-Börnstein - Group IV Physical Chemistry, vol. 5b, Berlin/Heidelberg: Springer-Verlag, pp. 1–2, doi:10.1007/10040476_390, ISBN 978-3-540-55115-7, retrieved 2024-05-15
- ^ Liao, P. K.; Spear, K. E.; Schlesinger, M. E. (Aug 1996). "The B-Sm (boron-samarium) system". Journal of Phase Equilibria. 17 (4): 347–350. doi:10.1007/BF02665562. ISSN 1054-9714.
- ^ Kim, J. Y.; Sung, N. H.; Kang, B. Y.; Kim, M. S.; Cho, B. K.; Rhyee, Jong-Soo (2010-05-01). "Magnetic anisotropy and magnon gap state of SmB4 single crystal". Journal of Applied Physics. 107 (9). doi:10.1063/1.3365061. ISSN 0021-8979.