Jan Hendrik de Boer
Together with Anton Eduard van Arkel, de Boer developed a chemical transport reaction for titanium, zirconium, and hafnium known as the crystal bar process. In a closed vessel the metal reacts with iodine at elevated temperature forming the iodide. At a tungsten filament of 1700 °C the reverse reaction occurs, and the iodine and the metal are set free. The metal forms a solid coating at the tungsten filament and the iodine can react with additional metal, resulting in a steady turnover.
- M + 2I2 (>400 °C) → MI4
- MI4 (1700 °C) → M + 2I2
- van Arkel, A. E.; de Boer, J. H. (1925). "Darstellung von reinem Titanium-, Zirkonium-, Hafnium- und Thoriummetall". Zeitschrift für anorganische und allgemeine Chemie. 148 (1): 345–350. doi:10.1002/zaac.19251480133.
- "J.H. de Boer (1899 - 1971)". Royal Netherlands Academy of Arts and Sciences. Retrieved 17 July 2015.
|This biographical article about a chemist is a stub. You can help Wikipedia by expanding it.|
|This article about a Dutch scientist is a stub. You can help Wikipedia by expanding it.|