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