Neptunium arsenide

Neptunium arsenide

Names
Other names Neptunium monoarsenide
Identifiers
CAS Number	39350-08-8  Y
3D model (JSmol)	Interactive image
ChemSpider	129549224
InChI InChI=1S/As.Np Key: AUGTYUNFKAYNPM-UHFFFAOYSA-N
SMILES [Np].[As]
Properties
Chemical formula	NpAs
Molar mass	311.92
Appearance	Crystals
Related compounds
Related compounds	Neptunium diarsenide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Neptunium arsenide is a binary inorganic compound of neptunium and arsenic with the chemical formula NpAs. ^[1] The compound forms crystals.

Synthesis

Heating stoichiometric amounts of pure substances:

${\displaystyle {\mathsf {Np+As\ {\xrightarrow {T,I_{2}}}\ NpAs}}}$

Physical properties

Neptunium arsenide forms crystals of several modifications: ^{[2] [3]}

• Cubic system, space group Fm3m, cell parameters a = 0.5835 nm, exists at temperatures below –131 °С.
• Tetragonal system, cell parameters a = 0.58312 nm, c = 0.58281 nm, exists in the temperature range –131 to –98 °С.
• Cubic system, space group Fm3m, cell parameters a = 0.58318 nm, exists at temperatures above –98 °C.

Neptunium arsenide becomes antiferromagnetic at 175 K. ^{[4] [5] [6]}

References

1. Los Alamos Science. Los Alamos National Laboratory. 2000. p. 172. Retrieved 8 August 2021.
2. "mp-2186: NpAs (cubic, Fm-3m, 225)". Materials Project . Retrieved 8 August 2021.
3. Arya, Balwant Singh; Patle, U. S.; Aynyas, Mahendra (24 April 2019). "High pressure structural and elastic properties of neptunium arsenide" . AIP Conference Proceedings. 2100 (1): 020148. Bibcode:2019AIPC.2100b0148A. doi:10.1063/1.5098702. ISSN   0094-243X. S2CID   149517034 . Retrieved 8 August 2021.
4. Erdos, Paul (6 December 2012). The Physics of Actinide Compounds. Springer Science & Business Media. p. 40. ISBN   978-1-4613-3581-8 . Retrieved 8 August 2021.
5. Aldred, A. T.; Dunlap, B. D.; Harvey, A. R.; Lam, D. J.; Lander, G. H.; Mueller, M. H. (1 May 1974). "Magnetic properties of the neptunium monopnictides" . Physical Review B . 9 (9): 3766–3779. Bibcode:1974PhRvB...9.3766A. doi:10.1103/PhysRevB.9.3766 . Retrieved 8 August 2021.
6. Blaise, A.; Fournier, J.M.; Damien, D.; Wojakowski, A. (1 February 1983). "Magnetization of neptunium monoarsenide" . Journal of Magnetism and Magnetic Materials . 31–34: 233–234. Bibcode:1983JMMM...31..233B. doi:10.1016/0304-8853(83)90229-9. ISSN   0304-8853 . Retrieved 8 August 2021.