Jan Hendrik de Boer (19 March 1899 – 25 April 1971) was a Dutch physicist and chemist.
De Boer was born in
Ruinen, now De Wolden, and died in The Hague. He studied at the [1 ] University of Groningen and was later employed in industry.
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. [2 ]
M + 2I
2 (>400 °C) → MI 4 MI
4 (1700 °C) → M + 2I 2
References [ edit ]
^ 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.