Beryllium nitride

Crystal structure
__  Be 2+      __  N 3−
Crystal system	cubic
Space group	Ia 3 (No. 206)
Lattice parameters	a = 814.518 pm
General
Surname	Beryllium nitride
other names	Triberyllium dinitride Beryllium (II) nitride
Ratio formula	Be 3 N 2
Brief description	white to gray solid
External identifiers / databases
CAS number 1304-54-7 EC number 215-132-6 ECHA InfoCard 100,013,757 Wikidata Q3271346
properties
Molar mass	55.05 g mol −1
Physical state	firmly
density	2.71 g cm −3
Melting point	2200 ° C (decomposition)
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Beryllium nitride is an inorganic chemical compound of beryllium from the group of nitrides .

Extraction and presentation

Beryllium nitride can be obtained by reacting beryllium with ammonia at 1100 ° C.

${\displaystyle \mathrm {3\ Be+2\ NH_{3}\longrightarrow \ Be_{3}N_{2}+3\ H_{2}} }$

It can also be represented from the elements at temperatures between 1100 ° C and 1500 ° C.

${\displaystyle \mathrm {3\ Be+N_{2}\longrightarrow Be_{3}N_{2}} }$

It is also formed when beryllium is burned in air, alongside beryllium oxide .

properties

Beryllium nitride is a white to gray solid that decomposes slowly in water and rapidly in acids and bases, releasing ammonia.

${\displaystyle \mathrm {Be_{3}N_{2}+6\ HCl\longrightarrow 3\ BeCl_{2}+2\ NH_{3}} }$

${\displaystyle \mathrm {Be_{3}N_{2}+6\ NaOH\longrightarrow 3\ Na_{2}BeO_{2}+2\ NH_{3}} }$

${\displaystyle \mathrm {Be_{3}N_{2}+6\ H_{2}O\longrightarrow 3\ Be(OH)_{2}+2\ NH_{3}} }$

In air it oxidizes at temperatures above 600 ° C. In a vacuum it sublimes at temperatures above 2000 ° C. The connection comes in two modifications. α-beryllium nitride has a cubic crystal structure of the defect anti- bixbyite type (a = 814.518 pm) with the space group Ia 3 (space group no.206 ) and β-beryllium nitride with a hexagonal crystal structure and the space group P 6 ₃ / mmc ( No. 194) . The low-temperature form α-beryllium nitride converts to the high-temperature form β-beryllium nitride at around 1450 ° C. In α-beryllium nitride the Be atoms are tetrahedrally surrounded by four N atoms, the N atoms are distorted octahedrally by six Be atoms.

use

Beryllium nitride is used as refractory ceramic and in nuclear reactors. It is also used for the nuclear production of C ¹⁴ , which is used as a radiotracer or as a radiopharmaceutical .

Individual evidence

1. ↑ O. Reckeweg, C. Lind, A. Simon, FJ DiSalvo: Rietveld Refinement of the crystal structure of alpha- (Be ₃ N ₂ ) and the experimental determination of optical band gaps for Mg ₃ N ₂ , Ca ₃ N ₂ and CaMg ₂ N ₂ . In: Zeitschrift für Naturforschung, B: Chemical Sciences , 2003 , 58 , pp. 159-162.
2. ↑ ^{a b c d e f g} Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2011, ISBN 978-1-4398-1462-8 , pp. 64 ( limited preview in Google Book search).
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
4. ↑ ^{a b c} Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 978-0-444-59553-9 , pp. 201 ( limited preview in Google Book search).
5. ↑ Riccardo Ferro, Adriana Saccone: Inter Metallic Chemistry . Elsevier, 2008, ISBN 978-0-08-044099-6 , pp. 470 ( limited preview in Google Book search).
6. ↑ Kenneth A. Walsh: Beryllium Chemistry and Processing . ASM International, 2009, ISBN 978-0-87170-721-5 , pp. 122 ( limited preview in Google Book search).
7. ^ HA Wriedt, H. Okamoto: The Be-N (Beryllium-Nitrogen) system. In: Journal of Phase Equilibria. 8, 1987, pp. 136-139, doi: 10.1007 / BF02873199 .
8. ^ Graham Lappin, Simon Temple: Radiotracers in Drug Development . CRC Press, 2006, ISBN 0-8493-3347-4 , pp. 33 ( limited preview in Google Book search).