Gadolinium(III) oxide

  • Gadolinium
  • Digadoliniumtrioxid
  • Gadolinia

Hygroscopic white solid

Fixed

7.41 g · cm -3

1900-2330 ° C

  • Insoluble in water
  • Partially soluble in acids

1.96

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Gadolinium oxide is the oxide of the rare earth metal gadolinium.

History

Gadolinium is one of the elements of the ytterbium earths in the periodic table and was found spectroscopically in 1880 by Jean Charles de Galissard Marignac in Didym and Gadolinit. 1886 put this forth as a white oxide of gadolinium Samarskite and called it Y Samarskite. In the same year Paul Emile Lecoq de Boisbaudran set forth gadolinium oxide and also named the new element after the discoverer of the mineral Gadolinit, the Finnish chemist Johan gadolinium, gadolinium.

Properties

Gadolinium oxide is an odorless white solid, which is insoluble in water. The compound is hygroscopic and absorbs moisture and carbon dioxide from the air. It comes in three modifications before (A -, B-, and C- type). The A- type has a hexagonal crystal lattice, the B- type is a monoclinic distortion of the A- type and C- type has an isomorphic cubic manganese (III ) oxide structure. At room temperature it crystallizes in the C- type, the other two structures are stable only at higher temperatures.

Use

Gadolinium oxide is used as a host lattice of the phosphors, for the preparation of fluorescent powders for the preparation of special optical glass with a high refractive index in the control rods of nuclear reactors and in pharmaceutical diagnostics ( contrast agents). Furthermore Gadoliumoxid for producing magneto- optical memories in the form of GGG ( gadolinium gallium garnet Gd3Ga5O12 ) or partly substituted as GGCMZ ( gallium - gadolinium - calcium - magnesium - zirconium - garnet (Gd, Ca) 3 (Ga, mg, Zr) 5O12 ) is used.

CAS registry number PubChem Rare earth element Jean Charles Galissard de Marignac Didymium Gadolinite Hexagonal crystal system Monoclinic crystal system Fluorescence Contrast medium CRC Handbook of Chemistry and Physics Digital Object Identifier
358599
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