Gallium(III) selenide

{{chembox

| Watchedfields = changed

| verifiedrevid = 431675791

| Name = Gallium(III) selenide

| ImageFile =

| ImageName = Gallium(III) selenide

| OtherNames = gallium triselenide

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 12024-24-7

| ChemSpiderID = 145438

| EINECS = 234-693-8

| PubChem = 165985

}}

|Section2={{Chembox Properties

| Formula = Ga₂Se₃

| MolarMass = 376.33 g/mol

| Appearance = reddish-black crystals

| Odor = slight garlic odor

| Density = 4.92 g/cm³

| Solubility = decomposition

| MeltingPtC = 1020

| BoilingPt =

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|Section7={{Chembox Hazards

| GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|301|330|373|410}}

| PPhrases = {{P-phrases|260|264|270|271|273|284|301+310|304+340|310|314|320|321|330|391|403+233|405|501}}

| NFPA-H = 3

| NFPA-R = 1

| NFPA-F = 0

}}

|Section8={{Chembox Related

| OtherAnions = Gallium(III) oxide, Gallium(III) sulfide, Gallium tribromide, Gallium(III) telluride

| OtherCations = Aluminium(III) selenide, Indium(III) selenide

| OtherCompounds = Gallium monoselenide

}}

}}

Gallium(III) selenide (Ga₂Se₃) is a chemical compound. It has a defect sphalerite (cubic form of ZnS) structure.{{Greenwood&Earnshaw}} It is a p-type semiconductor Temperature dependence of electrical conductivity and Hall effect of Ga₂Se₃ single crystal, A. E. Belal, Dr. H. A. El-shaikh, I. A. Ashraf, Crystal Research and Technology, 30, 1, 135 - 139

It can be formed by union of the elements. It hydrolyses slowly in water and quickly in mineral acids to form toxic hydrogen selenide gas. The reducing capabilities of the selenide ion make it vulnerable to oxidizing agents. It is advised therefore that it not come into contact with bases.{{citation needed|date=November 2015}}