Home
background
  • Key data; description
  • History
  • hydrogen around us
  • Uses
  • Geology
  • Biology
  • hydrogen compounds
  • Reactions of hydrogen
  • Compounds
  • Bond enthalpies
  • Radii in compounds
  • Lattice energies
  • Reduction potentials
  • nuclear properties
  • NMR
  • Naturally occurring isotopes
  • Radioisotopes
  • electronic properties
  • Electronic configuration
  • Ionization energies
  • Electron affinities
  • Electronegativities
  • Effective nuclear charges
  • Electron binding energies
  • Atom radii
  • Valence shell radii
  • physical properties
  • Bulk properties (density, resistivity, etc.)
  • Thermal properties (melting point, etc.)
  • Thermodynamic properties
  • crystallography
  • Crystal structure
  • Elements

    GADOLINIUM
    64
    Gd
    157.25 (3) g


    Name: gadoliniumGroup number: 0
    Symbol: GdGroup name: Lanthanoid
    Atomic number: 64Period number: 6
    Atomic weight: 157.25 (3) gBlock: f-block
    CAS Registry ID: 7440-54-2Voice:
    Standard state: solid at 298 KColour: silvery white
    Classification: MetallicAvailability:

    gadolinium
    This sample is from The Elements Collection, an attractive and safely packaged collection of the 92 naturally occurring elements that is available for sale.

    Gadolinium is silvery white, has a metallic lustre, and is is malleable and ductile. It is ferromagnetic (strongly attracted by a magnet).

    The metal is relatively stable in dry air, but in moist air it tarnishes with the formation of a loosely adhering oxide film which "spalls" off and exposes more surface to oxidation. The metal reacts slowly with water and is soluble in dilute acid. Gadolinium has the highest thermal neutron capture cross-section of any known element.

    Isolation

    Here is a brief summary of the isolation of gadolinium.

    Gadolinium metal is available commercially so it is not normally necessary to make it in the laboratory, which is just as well as it is difficult to isolate as the pure metal. This is largely because of the way it is found in nature. The lanthanoids are found in nature in a number of minerals. The most important are xenotime, monazite, and bastnaesite. The first two are orthophosphate minerals LnPO4 (Ln deonotes a mixture of all the lanthanoids except promethium which is vanishingly rare) and the third is a fluoride carbonate LnCO3F. Lanthanoids with even atomic numbers are more common. The most comon lanthanoids in these minerals are, in order, cerium, lanthanum, neodymium, and praseodymium. Monazite also contains thorium and ytrrium which makes handling difficult since thorium and its decomposition products are radioactive.

    For many purposes it is not particularly necessary to separate the metals, but if separation into individual metals is required, the process is complex. Initially, the metals are extracted as salts from the ores by extraction with sulphuric acid (H2SO4), hydrochloric acid (HCl), and sodium hydroxide (NaOH). Modern purification techniques for these lanthanoid salt mixtures are ingenious and involve selective complexation techniques, solvent extractions, and ion exchange chromatography.

    Pure gadolinium is available through the reduction of GdF3 with calcium metal.

    2GdF3 + 3Ca 2Gd + 3CaF2

    This would work for the other calcium halides as well but the product CaF2 is easier to handle under the reaction conditions (heat to 50°C above the melting point of the element in an argon atmosphere). Excess calcium is removed from the reaction mixture under vacuum.

    Fluorides
  • GdF3
  • Chlorides
  • GdCl3
  • GdCl3.6H2O
  • Bromides
  • GdBr3
  • Iodides
  • GdI2
  • GdI3
  • Hydrides
    none listed
    Oxides
  • Gd2O3
  • Sulfides
  • Gd2S3
  • Selenides
  • GdSe
  • Tellurides
  • Gd2Te3
  • Nitrides
  • GdN






  • Our data and resources are taken from Web Elements