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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.[1] He studied at the University of Groningen and was later employed in industry.

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.[2]

M + 2I2 (>400 °C) → MI4
MI4 (1700 °C) → M + 2I2

De Boer became a member of the Royal Netherlands Academy of Arts and Sciences in 1940, and foreign member in 1947.[3]


  1. ^ CV
  2. ^ 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.
  3. ^ "J.H. de Boer (1899 - 1971)". Royal Netherlands Academy of Arts and Sciences. Retrieved 17 July 2015.