21. Moseley was killed in World War I in 1915, years before hafnium was discovered. 22. His thesis was " The Radioactive Decay of Hafnium and Thulium Isotopes ". 23. Hafnium tetrachloride is volatile and can therefore easily be separated from the involatile zirconium trihalide.24. What is hafnium 's cosmic history? 25. Titanium, hafnium and zirconium stabilize the ? phase at room temperature when rapidly cooled. 26. Hafnium is widely used in filaments and electrodes, as well as in some superalloys.27. Most of the hafnium produced is used in the production of control rods for nuclear reactors. 28. Small additions of hafnium increase the adherence of protective oxide scales on nickel-based alloys. 29. For example, hafnium is almost always present in quantities ranging from 1 to 4 %. 30. Hafnium diboride is another such material.
