| Application |
- When heated in the presence of water vapor, lanthanum oxochloride is formed:
- LaCl3 + H₂O→LaOCl + 2HCl
- Heating with glass at elevated temperatures also forms oxochloride:
- LaCl3 + SiO2→2LaOCl + SiCl4
- Lanthanum chloride reacts with hydrogen sulfide when heated at 1100°C, forming lanthanum sulfide:
- 2LaCl3 + 3H2S→La2S3 + 3H2S
- Reactions with ammonia and phosphine at elevated temperatures yield lanthanum nitride and phosphide, respectively:
- LaCl3 + PH3→LaP + 3HCl
- Lanthanum chloride is reduced to lanthanum metal when heated with an alkali or alkaline earth metal at temperatures above 1000°C:
- LaCl3 + 3Li→La + 3LiCl
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