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| boron carbide |
a very hard black crystalline compound used in nuclear reactor control rods, as reinforcement in structural materials, and as an abrasive. |
| hafnium |
a chemical element that has seventy-two protons in each nucleus and that occurs as a tetravalent metal often found in combination with zirconium, used in pure form for applications such as nuclear reactor control rods because it absorbs neutrons well. (symbol: Hf) |
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