33 Aluminium Compounds: Formulas, Properties & Industrial Uses

While pure aluminium is widely recognized for its structural uses in aerospace and construction, its true chemical versatility is found in its extensive range of compounds. From high-tech semiconductors to essential industrial catalysts, aluminium-based substances are foundational to modern engineering and chemistry.

This master guide provides a technical overview of the 33 essential aluminium compounds, linking to comprehensive deep-dives for each specific compound.

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Industrial Oxides & Hydroxides (3 compounds)

These compounds form the backbone of the aluminium industry, from raw material processing to advanced flame retardants.

• Aluminium Oxide (Alumina) (Al₂O₃) – Primary smelting feedstock, abrasive, refractory ceramic
• Aluminium Hydroxide (Al(OH)₃) – Flame retardant, antacid, vaccine adjuvant
• Aluminium Titanate (Al₂TiO₅) – Diesel particulate filters, thermal shock resistant ceramics

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Halides & Fluorine Compounds (6 compounds)

Aluminium halides serve as powerful Lewis acid catalysts and essential smelting electrolytes.

• Aluminium Chloride (AlCl₃) – Friedel-Crafts catalyst, petrochemical refining
• Aluminium Bromide (AlBr₃) – Specialized organic synthesis catalyst
• Aluminium Iodide (AlI₃) – Laboratory reducing agent, organic synthesis
• Aluminium Fluoride (AlF₃) – Aluminium smelting bath additive
• Sodium Aluminium Fluoride (Cryolite) (Na₃AlF₆) – Electrolyte solvent in Hall-Héroult process
• Aluminium Chlorohydrate (Al₂(OH)₅Cl) – Antiperspirant active ingredient

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Pnictides – Semiconductors (4 compounds)

Aluminium pnictides are critical for infrared optics, LEDs, and high-speed electronics.

• Aluminium Arsenide (AlAs) – Semiconductor lasers, infrared optics
• Aluminium Antimonide (AlSb) – Infrared detectors, high-electron-mobility transistors
• Aluminium Nitride (AlN) – High thermal conductivity electronic substrates
• Aluminium Phosphide (AlP) – Agricultural fumigant (releases PH₃)

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Chalcogenides & Sulfur Compounds (5 compounds)

These compounds range from essential water treatment chemicals to highly reactive moisture‑sensitive materials.

• Aluminium Sulfate (Alum) (Al₂(SO₄)₃) – Water purification coagulant, paper sizing
• Aluminium Sulfide (Al₂S₃) – Laboratory H₂S generator
• Aluminium Selenide (Al₂Se₃) – Research – H₂Se source
• Aluminium Telluride (Al₂Te₃) – Research – H₂Te source
• Aluminium Phosphate (AlPO₄) – Antacid, vaccine adjuvant, dental cement

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Organometallic & Hydride Compounds (4 compounds)

These are powerful reducing agents and precursors for advanced material deposition.

• Trimethylaluminium (TMA) (Al₂(CH₃)₆) – ALD precursor for Al₂O₃ thin films
• Lithium Aluminium Hydride (LAH) (LiAlH₄) – Powerful reducing agent in organic synthesis
• Aluminium Hydride (Alane) (AlH₃) – Rocket fuel research, hydrogen storage
• Aluminium Acetate (Al(C₂H₃O₂)₃) – Burow’s Solution (astringent, antiseptic)

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Carbides, Carbonates & Nitrates (5 compounds)

These compounds serve as precursors, oxidizers, and specialized ceramics.

• Aluminium Carbide (Al₄C₃) – Methane generator, metal matrix composites
• Aluminium Carbonate (Al₂(CO₃)₃) – Phosphate binder in renal medicine
• Aluminium Nitrate (Al(NO₃)₃) – Alumina precursor, uranium extraction, oxidizer
• Aluminium Chlorate (Al(ClO₃)₃) – Strong oxidizer, specialty pyrotechnics
• Aluminium Borate (AlBO₃ / Al₁₈B₄O₃₃) – Whisker reinforcement for ceramics

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Silicates, Tungstates, Molybdates & Organic Salts (6 compounds)

These compounds offer specialized properties: negative thermal expansion, catalysis, waterproofing, and cosmetic uses.

• Aluminium Silicate (Al₂SiO₅) – Refractory bricks, spark plug insulators
• Aluminium Tungstate (Al₂(WO₄)₃) – Negative thermal expansion research
• Aluminium Molybdate (Al₂(MoO₄)₃) – Hydrodesulfurization catalyst precursor
• Aluminium Lactate (C₉H₁₅AlO₉) – Sensitive toothpaste, gentle astringent
• Aluminium Stearate (Al(C₁₈H₃₅O₂)₃) – Waterproofing agent, grease thickener
• Potassium Alum (KAl(SO₄)₂·12H₂O) – Pickling crispness, crystal deodorant, styptic

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Technical Summary by Category

Compound Category	Number of Compounds	Primary Applications
Oxides & Hydroxides	3	Smelting, flame retardants, refractories
Halides & Fluorine	6	Catalysis, smelting electrolytes, antiperspirants
Pnictides (Semiconductors)	4	Lasers, LEDs, IR detectors, fumigation
Chalcogenides & Sulfates	5	Water treatment, H₂S/H₂Se/H₂Te sources
Organometallics & Hydrides	4	ALD precursors, reducing agents, rocket fuel
Carbides, Nitrates, Chlorates	5	Precursors, oxidizers, composites
Silicates, Tungstates, Molybdates	6	Thermal management, catalysis, cosmetics
TOTAL	33	–

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Why This Matters for Industry

Understanding the molecular behavior of these 33 compounds allows engineers and researchers to select the right material for specific applications:

• High‑temperature environments: Alumina, Aluminium Titanate, Aluminium Silicate
• Semiconductor fabrication: Aluminium Arsenide, Aluminium Nitride, Trimethylaluminium (TMA)
• Water treatment & pharmaceuticals: Aluminium Sulfate, Aluminium Phosphate, Potassium Alum
• Specialized catalysis: Aluminium Chloride, Aluminium Molybdate
• Negative thermal expansion research: Aluminium Tungstate
• Moisture‑sensitive hazardous materials: Aluminium Phosphide, Aluminium Selenide, Aluminium Telluride