Praseodymium hexaboride
Chemical compound
From Wikipedia, the free encyclopedia
Praseodymium hexaboride is a binary inorganic compound of praseodymium and boron with the formula PrB6. It forms black crystals that are insoluble in water.
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| Names | |
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| Other names
Praseodymium boride | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.382 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| PrB6 | |
| Molar mass | 205.77 g/mol |
| Appearance | black crystals |
| Density | 4.84 g/cm3 |
| Melting point | 2610 °C[1] |
| Structure | |
| Cubic | |
| Pm3m ; Oh | |
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
Praseodymium hexaboride can be prepared from the reaction of stoichiometric quantities of praseodymium and boron:
- Pr + 6B → PrB6
Properties
Praseodymium hexaboride forms black crystals of the cubic crystal system, with space group Pm3m, cell parameters a = 0.4129 nm, Z = 1, and structure isotypical with calcium hexaboride.[2] The compound melts congruently at 2610 °C.[3] At temperatures below 7 K, a magnetic transition to an antiferromagnetic state occurs in the compound.[4][5][6] It does not dissolve in water.
Uses
Praseodymium hexaboride is used as a component of alloys for cathodes of high-power electronic devices.