Praseodymium tetraboride

Praseodymium tetraboride
Names
IUPAC name
Praseodymium tetraboride
Identifiers
3D model (JSmol)
  • InChI=1S/4B.Pr
    Key: VWSAUODVKXTDCZ-UHFFFAOYSA-N
  • [Pr].[B].[B].[B].[B]
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
 Praseodymium hexaboride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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. ^ a b Диаграммы состояния двойных металлических систем. Vol. 1. М.: Машиностроение. 1996. ISBN 5-217-02688-X. {{cite book}}: Unknown parameter |agency= ignored (help)
  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.