Zirconium

Atomic number: 40

Symbol: Zr

Category: transition metal

Density at 25°C: solid:  6.52 g·cm−3

Most zirconium is used in compounds for high temperature applications like in ceramics of crucibles for heating, both big and small. But it also is used for adding a white opacity to substances. 

The name Zirconium is from the Persian word "zargun - زرگون", meaning "gold colored"

A crystal bar of zirconium. image: adapted from wikipedia


Use, natural applications or common combinations: 

  • aerospace applications for high temperatures
  • Sand paper abrasives
  • Zircon and jewellry


Basic characteristics:

  • Standard atomic weight: 91.224(2)
  • Melting point: 1855 °C
  • Boiling point: 4409 °C
  • Radioactivity: most naturally stable
    • 89Zr being used as PET scanning with halflife of 78.4 hours