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