Jan Hendrik de Boer
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Jan Hendrik de Boer | |
|---|---|
 J. H. de Boer, 1947 | |
| Born | March 19, 1899 |
| Died | April 25, 1971 (aged 72) |
| Alma mater | University of Groningen |
| Known for | Van Arkel–de Boer process Metal–insulator transition |
Jan Hendrik de Boer (19 March 1899 – 25 April 1971) was a Dutch physicist and chemist.
De Boer was born in Ruinen, 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
This process is now known as Van Arkel–de Boer process.
However, in 1937 De Boer and Evert Verwey reported that many transition-metal oxides (such as NiO) with a partially filled d-band were poor conductors, often insulating. This led to the concept of metal–insulator transition.[3]
In 1940, De Boer became a member of the Royal Netherlands Academy of Arts and Sciences, and foreign member in 1947.[4]
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