Bismuth(III) oxide

  • Dibismuth trioxide
  • Bismuth
  • Bismuth

Pale yellow, odorless solid

Fixed

8.93 g · cm -3

817 ° C

1890 ° C

Practically insoluble in water

5000 mg · kg -1 ( LD50, rat, oral)

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Bismuth ( III) oxide is a chemical compound (an oxide ) of bismuth and oxygen. It is the most important bismuth compound used industrially.

Occurrence

Of course bismuth comes (III ) oxide in the mineral untilWed ( bismuth ocher ) before, but is usually obtained as a byproduct in the smelting of copper, tin and lead ores.

Production and representation

Can be obtained bismuth ( III) oxide by combustion of bismuth.

Analytically pure bismuth ( III) oxide is obtained by heating pure bismuth ( III) nitrate pentahydrate to 700 ° C.

Properties

Physical Properties

Bismuth ( III) oxide is available in four different crystal structures ( α - δ ) in front of which there is at room temperature, the monoclinic α variant.

Chemical Properties

Bismuth ( III) oxide is insoluble in water and common organic solvents, but soluble in dilute acids and not in strong caustic solutions in glycerine addition. With other metal oxides is bismuth ( III) oxide solid solutions, a slight, so dissolved, molten bismuth ( III) oxide, and even each metal corrodes platinum.

With hydrochloric acid or hydrofluoric acid reacts bismuth (III ) oxide to bismuth ( III ) chloride and bismuth ( III ) fluoride.

Use

Bismuth ( III) oxide is used:

  • As a starting material for the preparation of bismuth (reduction of bismuth (III ) oxide with carbon)
  • As a chemical for Fireworks
  • In solid oxide fuel cells
  • In glasses
  • As a catalyst in the ceramics industry
  • As of medicinal drug for eradication of Helicobacter pylori
CAS registry number Bismuth(III) nitrate Monoclinic crystal system Thermo Fisher Scientific
122997
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