Editing Cadmium arsenide (section)

== Crystal structure ==

The unit cell of Cd<sub>3</sub>As<sub>2</sub> is tetragonal.<ref name = inorg/><ref>{{Cite journal | doi = 10.1103/PhysRevMaterials.3.084202 | title = Point group symmetry of cadmium arsenide thin films determined by convergent beam electron diffraction | journal = Physical Review Materials | volume = 3 | pages  = 084202 | year = 2019 | last1 = Kim | first1 = H. | last2 = Goyal | first2 = M. | last3 = Salmani-Rezaie | first3 = S. | last4 = Schumann | first4 = T. | last5 = Pardue | first5 = T. N. | last6 = Zuo | first6 = J-M. | last7 = Stemmer | first7 = S.| doi-access = free | arxiv = 1908.05734 }}</ref> The arsenic ions are [[Close-packing of equal spheres|cubic close packed]] and the cadmium ions are tetrahedrally coordinated. The vacant tetrahedral sites provoked research by von Stackelberg and Paulus (1935), who determined the primary structure. Each arsenic ion is surrounded by cadmium ions at six of the eight corners of a distorted cube and the two vacant sites were at the diagonals.<ref name = inorg/>

The crystalline structure of cadmium arsenide is very similar to that of [[zinc phosphide|zinc phosphide (Zn<sub>3</sub>P<sub>2</sub>)]], [[zinc arsenide|zinc arsenide (Zn<sub>3</sub>As<sub>2</sub>)]] and [[cadmium phosphide|cadmium phosphide (Cd<sub>3</sub>P<sub>2</sub>)]]. These compounds of the [[Zinc cadmium phosphide arsenide|Zn-Cd-P-As]] quaternary system exhibit full continuous solid-solution.<ref name="Trukhan">{{Cite journal|title=Compounds and solid solutions of the Zn-Cd-P-As system in semiconductor electronics|journal=Inorganic Materials|last1=Trukhan|first1=V. M.|volume=50|pages=868–873|last2=Izotov|first2=A. D.|issue=9|doi=10.1134/S0020168514090143|year=2014|last3=Shoukavaya|first3=T. V.|s2cid=94409384 }}</ref>