| 1. | Today, the seal a stylized image of the hafnium atom.
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| 2. | These TPS materials are based on zirconium diboride and hafnium diboride.
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| 3. | In this compound, the hafnium centers adopt octahedral coordination geometry.
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| 4. | The zirconium mixture also included hafnium, uranium and iron.
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| 5. | The separated hafnium can be used for reactor control rods.
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| 6. | The 1923 discovery of hafnium validated Mendeleev's original 1869 prediction.
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| 7. | These include hafnium diboride, zirconium diboride, and some similar materials.
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| 8. | Zirconium free from hafnium is required for nuclear reactor construction.
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| 9. | Hafnium is estimated to make up about 5.8 crust by mass.
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| 10. | Hafnium has excellent properties for reactors using water for both moderation and cooling.
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