Copper (I) Telluride (Cu2Te) is an alloy of copper and tellurium. Tellurium improves the machinability of copper. Its crystal structure belongs to an unconventional zinc-blende structure, in which each copper atom is surrounded by four tellurium atoms to form a tetrahedral structure. This structure gives copper(I) telluride some special characteristics in optical, electrical, and thermal properties. At low temperatures, it can show ferromagnetic or antiferromagnetic behavior, which makes it also have certain application prospects in spintronics and magnetic storage fields.

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• Compound Formula: Cu₂Te
• Molecular Weight: 254.69
• Appearance: Bluish-black pieces, powder, or chunks
• Density: 7.27 g/cm³
• Melting point: 900 ℃
• Solubility: Insoluble in water, hydrochloric acid, and sulfuric acid, but soluble in bromine water. 

Applications:

• Used for photovoltaic solar cells due to its tunable bandgap and excellent light absorption capabilities.
• Used as a photosensitive material in the development of optoelectronic sensors.
• Used for developing light-emitting devices, such as LEDs.
• Used in magnetic storage devices.
• Used as a thermoelectric material in power generation and waste heat recovery.