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nature : Part IV of the Periodic System vice ethnic group (Ti,) elements. Atomic number 72. Stable isotopes : 174,176,177,178,179,180. Amu 178.49. A bright silver metal. Zirconium chemical nature and almost the same. Density 13.31. 2227 ° C melting point. The boiling point of about 4,600 ° C Valence +2, +3 and +4. At room temperature on the water and air are stable, it is difficult role with acid. Have good corrosion resistance. But under high temperature and easy halogen, oxygen, sulfur and nitrogen or carbon and other chemical combination. No separate ore, and often coexist with the zirconium. Hafnium metal X-ray tube used for the cathode material, as well as atomic reactor structural material, and hard for the fusion (Hf alloy Ta4HfC5 up to the melting point 4215 ° C) and filament manufacturing industry. May 4 HfCl4 hafnium chloride or sodium and magnesium reduction by thermal and prepared.
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