Basic information Safety Supplier Related

Calcium Arsenide

Basic information Safety Supplier Related

Calcium Arsenide Basic information

Product Name:
Calcium Arsenide
Synonyms:
  • tricalcium diarsenide
  • CALCIUM ARSENIDE
CAS:
12255-53-7
MF:
AsCaH2
MW:
117.02
EINECS:
235-509-9
Mol File:
12255-53-7.mol
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Calcium Arsenide Chemical Properties

EPA Substance Registry System
Calcium arsenide (Ca3As2) (12255-53-7)
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Calcium Arsenide Usage And Synthesis

Description

Calcium arsenide has the molecular formula of Ca3As2 and the molecular weight of 270.0772 g/mol. It may be prepared by reacting the elements together.
Since As sublimes at 614°C and Ca melts at 839°C, the latter is melted at about 875°C in an inert atmosphere like argon (not N2 which would form nitrides) and arsenic vapors are carried into the reaction zone by a stream of Ar gas:
3Ca + 2As + heat ? Ca3As2
Its CAS number is 12255-53-7. The standard Gibbs energies of formation of Ca3As2 was determined by a chemical equilibration technique yielding the following results:
3Ca + 2As ? Ca3As2 (solid)
△G°= -723,800 + 172.8T (J/mol)
(T = 1273 to 1573 K)
Calcium arsenide has the zinc-blende (cubic) structure with a = 6.751 ? . It can also be prepared by the reduction of calcium arsenate by carbon:
2Ca3AsO4 + 5C + heat ? Ca3As2 + 2CaO + 3CO2

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