europium

/ju:'roupiəm/

Thân thiện

A scientist holds a small vial containing europium under a laboratory light.

Definition

1. Noun:
   • A chemical element: Europium is a metallic element belonging to the lanthanide series of the periodic table, known as a rare earth element. It is characterized by its ability to commonly form both bivalent (Eu²⁺) and trivalent (Eu³⁺) ions.

Usage Examples

• Noun:
  • Europium is used in the phosphors of television screens and fluorescent lamps.
  • The scientist isolated a sample of pure europium for the experiment.

Advanced Usage

• In scientific contexts: The term is used precisely to denote the element with atomic number 63 and symbol Eu.
  • The luminescent properties of europium-doped materials are critical for certain laser applications.

Variants and Related Words

• Europium oxide (n): A compound of europium and oxygen.
  • Europium oxide is a key material in red phosphors.
• Europium(III) ion (n): The trivalent cationic form of europium (Eu³⁺).

Synonyms

• Element 63: Referring to its atomic number.
• Rare earth metal: A broader category to which it belongs.

Related Phrases

• Doped with europium: A common phrase in materials science describing a host material that has had europium ions added to it.
  • The crystal was doped with europium to enhance its red emission.

Học thuật

Noun

1. a bivalent and trivalent metallic element of the rare earth group

Từ đồng nghĩa

• Eu
• atomic number 63