Indium(III) sulfide

Indium

Orange red solid

Fixed

4.45 g · cm -3

1050 ° C.

Insoluble in water

Attention

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Indium (III ) sulfide is an inorganic chemical compound of indium and sulfur. It is a red under normal conditions of salt which can be precipitated from aqueous solution.

Production and representation

Indium (III ) sulfide can be obtained by reaction of indium ( III) oxide with hydrogen sulfide at 700 ° C.

The low-temperature modification, by precipitating an acetic acid, acetate-buffered In (III ) salt solution obtained with hydrogen sulfide.

Properties

There are known three modifications of the indium (III) sulfide. These can be converted by changing the temperature with each other. To 450 ° C, the β - modification is stable. This has a red color and a body-centered tetragonal crystal structure ( space group ) is above 450 ° C is indium (III) sulfide, in the up to 750 ° C stable α - modification on. This is a spinel structure with defects and γ -alumina isotypic (space group: ). γ - indium (III ) sulfide is stable between 750 ° C and the melting point form of the indium (III) sulfide. This forms a cubic closest packing of sulfur atoms with indium in all octahedral sites. The space group is.

Use

Indium (III ) sulfide eV with a band gap of from 2 to 2.2, an n -type semiconductor. As such, the material can be used as a buffer layer in solar cells. It is intended to replace the toxic cadmium sulfide.