Praseodymium tetraboride

Praseodymium tetraboride

Names
IUPAC name Praseodymium tetraboride
Identifiers
CAS Number	12007-78-2
3D model (JSmol)	Interactive image
InChI InChI=1S/4B.Pr Key: VWSAUODVKXTDCZ-UHFFFAOYSA-N
SMILES [Pr].[B].[B].[B].[B]
Properties
Chemical formula	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	Praseodymium hexaboride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Praseodymium tetraboride is a binary inorganic compound of praseodymium and boron with the chemical formula PrB₄.

Preparation

Praseodymium tetraboride can be prepared by directly reacting the elements at 2350 °C:

Pr + 4 B → PrB₄

Properties

Praseodymium 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

1. Н. П. Лякишева, ed. (1996). Диаграммы состояния двойных металлических систем. Vol. 1. М.: Машиностроение. ISBN   5-217-02688-X.
2. 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.
3. 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.