alumina

/ə'lju:minə/
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alumina

Alumina is a key ingredient in the production of synthetic sapphire.

Definition
  1. Noun:
    • A compound of aluminum and oxygen: "alumina" is a chemical compound, specifically aluminum oxide (Al₂O₃), which occurs naturally in various mineral forms.
    • A key industrial material: It refers to the refined oxide of aluminum, used extensively in the production of aluminum metal and as an abrasive or refractory material.
Usage Examples
  • Noun:
    • The bauxite ore is processed to extract alumina.
    • Alumina is a primary component in the ceramics used for spark plugs.
Advanced Usage
  • "Activated alumina": A highly porous form of alumina used as a desiccant (drying agent) or catalyst support.
    • The laboratory uses activated alumina to dry gases.
  • "Alumina hydrate": A form of aluminum oxide containing water molecules, used as a flame retardant.
    • Alumina hydrate is added to plastics to improve fire resistance.
Variants and Related Words
  • Aluminum oxide (n): The systematic chemical name for alumina.
  • Corundum (n): A naturally occurring crystalline form of alumina, which includes gemstones like ruby and sapphire.
  • Bauxite (n): The principal ore from which alumina is commercially extracted.
Synonyms
  • Aluminum oxide: The precise chemical term.
  • Alundum (trademark): A synthetic abrasive material made from fused alumina.
Related Phrases

(Note: As a technical noun, "alumina" does not form standard phrasal verbs or idioms. Its usage is primarily in scientific, industrial, and technical contexts.)

alumina

Alumina is a key ingredient in the production of synthetic sapphire.

Noun
  1. any of various forms of aluminum oxide occurring naturally as corundum

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