Praseodymium tetraboride is a binary inorganic compound of praseodymium and boron with the chemical formula PrB4.
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| Names | |
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| IUPAC name
Praseodymium tetraboride
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| Identifiers | |
3D model (JSmol)
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| Properties | |
| PrB4 | |
| Molar mass | 184.15 g/mol |
| Density | 5.6 g/cm3 |
| Melting point | 2,350 °C (4,260 °F; 2,620 K) |
| Related compounds | |
Related compounds
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Praseodymium 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
editPraseodymium tetraboride can be prepared by directly reacting the elements at 2350 °C:
- Pr + 4 B → PrB4
Properties
editPraseodymium tetraboride forms crystals of tetragonal system, space group P4/mbm, cell parameters a = 0.7242 nm, c = 0.4119 nm, Z = 4, structure like thorium tetraboride.[1][2]
The compound is formed by a peritectic reaction and melts at 2350 °C.[1]
At a temperature of 19.5 K, the compound undergoes a transition to an antiferromagnetic state, and at a temperature of 15.9 K, to a ferromagnetic state.[3]
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) - ^ Schlesinger, M.E. (1998-02-02). "The Lesser-Known B-Ln (Boron-Lanthanide) Systems: B-Dy (Boron-Dysprosium), B-Ho (Boron-Holmium), B-Lu (Boron-Lutetium), B-Pr (Boron-Praseodymium), B-Tm (Boron-Thulium), and B-Yb (Boron-Ytterbium)". Journal of Phase Equilibria. 19 (1): 49–55. doi:10.1361/105497198770342742.
- ^ Wigger, G. A.; Felder, E.; Monnier, R.; Ott, H. R.; Pham, L.; Fisk, Z. (2005-07-08). "Low-temperature phase transitions in the induced-moment system Pr B 4". Physical Review B. 72 (1): 014419. doi:10.1103/PhysRevB.72.014419. ISSN 1098-0121.