Praseodymium tetraboride

Praseodymium tetraboride

Names
IUPAC name Praseodymium tetraboride
Identifiers
CAS Number	12077-78-2
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