praseodymium
/,preiziə'dimiəm/
Học thuậtThân thiện
Definition
- Noun:
- A chemical element: Praseodymium is a soft, malleable, silvery-yellow metallic element. It is part of the lanthanide series, often referred to as the rare-earth elements. In its pure form, it is relatively stable in air but will develop a green oxide coating if exposed. It is trivalent, meaning it commonly forms compounds with an oxidation state of +3.
Examples of Usage
- Noun:
- Praseodymium is used in the cores of carbon arc lights for studio lighting and projection.
- The alloy mischmetal, used in lighter flints, contains about 5% praseodymium.
- Scientists are studying praseodymium compounds for potential use in high-strength permanent magnets.
Advanced Usage
- Scientific Context: In chemistry and materials science, "praseodymium" is often discussed in the context of its ionic properties, spectral lines, or its role in doping other materials to alter their optical or magnetic properties.
- The praseodymium ion (Pr³⁺) is known for its sharp fluorescence lines, which are useful in fiber optic amplifiers.
Variants and Related Words
- Praseodymia (n): An archaic or less common term for praseodymium(III) oxide (Pr₂O₃).
- Praseodymous (adj): A rarely used adjective pertaining to praseodymium.
Synonyms
- Pr (n): The standard chemical symbol for praseodymium (atomic number 59).
- Rare-earth element / Lanthanide (n): The broader category to which praseodymium belongs. (Note: This is a categorical synonym, not a direct substitute for the element name.)
Related Phrases and Compounds
- Praseodymium oxide (n): A compound of praseodymium and oxygen (Pr₆O₁₁ or Pr₂O₃).
- Praseodymium-neodymium alloy (n): A mixture of these two rare-earth elements, used in magnets.
- Praseodymium-doped fiber (n): An optical fiber infused with praseodymium ions to amplify light signals.
Noun
- a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process