Neptunium silicide

Neptunium silicide
Names
	Other names Neptunium disilicide
Identifiers
CAS Number	60862-56-8 ;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/Np.2Si Key: KBXNGDVSIABQJL-UHFFFAOYSA-N;
	SMILES [Np].[Si].[Si];
Properties
Chemical formula	NpSi2
Appearance	Crystals
Density	9.03
Solubility in water	insoluble
Related compounds
Related compounds	Plutonium silicide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Neptunium silicide is a binary inorganic compound of neptunium and silicon with the chemical formula NpSi
₂.^[1] The compound forms crystals and does not dissolve in water.^[2]

Synthesis

Heating neptunium trifluoride with powdered silicon in vacuum:^[3]

{\mathsf {4NpF_{3}+11Si\ \xrightarrow {1500^{o}C} \ 4NpSi_{2}+3SiF_{4}}}

Physical properties

Neptunium silicide forms crystals^[4] of tetragonal crystal system, space group I4₁/amd, cell parameters: a = 0.396 nm, c = 1.367 nm, Z = 4.^[5]

Neptunium disilicide does not dissolve in water.

Chemical properties

Neptunium disilicide reacts with HCl:^[3]

{\mathsf {NpSi_{2}+8HCl\ \xrightarrow {\ } NpCl_{4}+2SiH_{4}}}

References

^ Donnay, J. D. H.; Nowacki, Werner (1954). Crystal Data: Classification of Substances by Space Groups and their Identification from Cell Dimensions. Geological Society of America. p. 383. ISBN 978-0-8137-1060-0. Retrieved 16 August 2021.
^ Koch, Günter (5 October 2013). Transurane: Teil C: Die Verbindungen (in German). Springer-Verlag. p. 245. ISBN 978-3-662-11547-3. Retrieved 16 August 2021.
^ ^a ^b Sheft, Irving; Fried, Sherman (1950). New Neptunium Compounds. U.S. Atomic Energy Commission, Technical Information Division. p. 4. Retrieved 16 August 2021.
^ Zachariasen, William Houlder (1949). The Crystal Structure of Uranium Silicides and of CeSi2, NpSi2, and PuSi2. U.S. Atomic Energy Commission, Technical Information Branch. p. 3. Retrieved 16 August 2021.
^ "mp-21298: NpSi2 (tetragonal, I4_1/amd, 141)". materialsproject.org. Retrieved 16 August 2021.

[CD-1] Donnay, J. D. H.; Nowacki, Werner (1954). Crystal Data: Classification of Substances by Space Groups and their Identification from Cell Dimensions. Geological Society of America. p. 383. ISBN 978-0-8137-1060-0. Retrieved 16 August 2021.

[2] Koch, Günter (5 October 2013). Transurane: Teil C: Die Verbindungen (in German). Springer-Verlag. p. 245. ISBN 978-3-662-11547-3. Retrieved 16 August 2021.

[NNC-3] Sheft, Irving; Fried, Sherman (1950). New Neptunium Compounds. U.S. Atomic Energy Commission, Technical Information Division. p. 4. Retrieved 16 August 2021.

[4] Zachariasen, William Houlder (1949). The Crystal Structure of Uranium Silicides and of CeSi2, NpSi2, and PuSi2. U.S. Atomic Energy Commission, Technical Information Branch. p. 3. Retrieved 16 August 2021.

[MP-5] "mp-21298: NpSi2 (tetragonal, I4_1/amd, 141)". materialsproject.org. Retrieved 16 August 2021.

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