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==Synthesis==
==Synthesis==
Heating [[neptunium trifluoride]] with powdered silicon in vacuum<ref name="NNC">{{cite book |last1=Sheft |first1=Irving |last2=Fried |first2=Sherman |title=New Neptunium Compounds |date=1950 |publisher=U.S. Atomic Energy Commission, Technical Information Division |page=4 |url=https://books.google.com/books?id=c1bcqdRlz4IC&q=Neptunium+silicide&pg=PA4 |access-date=16 August 2021 |language=en}}</ref>:
Heating [[neptunium trifluoride]] with powdered silicon in vacuum<ref name="NNC">{{cite book |last1=Sheft |first1=Irving |last2=Fried |first2=Sherman |title=New Neptunium Compounds |date=1950 |publisher=U.S. Atomic Energy Commission, Technical Information Division |page=4 |url=https://books.google.com/books?id=c1bcqdRlz4IC&q=Neptunium+silicide&pg=PA4 |access-date=16 August 2021 |language=en}}</ref>:
::<math>\mathsf{ 4NpF_3 + 11Si \ \xrightarrow{1500^oC}\ 4NpSi_2 + 3SiF_4 }</math>
::<math>\mathsf{ 4 NpF_3 + 11Si \ \xrightarrow{1500^oC}\ 4NpSi_2 + 3SiF_4 }</math>


==Physical properties==
==Physical properties==

Revision as of 21:11, 29 August 2021

Neptunium silicide
Names
Other names
Neptunium disilicide
Identifiers
3D model (JSmol)
  • InChI=1S/Np.2Si
    Key: KBXNGDVSIABQJL-UHFFFAOYSA-N
  • [Np].[Si].[Si]
Properties
Si2
Molar mass 56.170 g·mol−1
Appearance Crystals
Density 9.03
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).

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]:

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]:

References

  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.
  3. ^ a b 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.
  5. ^ "mp-21298: NpSi2 (tetragonal, I4_1/amd, 141)". materialsproject.org. Retrieved 16 August 2021.