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Several plutonium borides can be formed by direct combination of plutonium and boron powders in an inert atmosphere at reduced pressure. PuB was reported to form at 1200 °C with a range of 40–70% boron. It supposedly has a Pu-B bond length of 2.46 Å and the NaCl structure, as do TiB, ZrB and HfB. The existence of PuB was contested later based on several arguments. PuB2 is formed at 800 °C and has a similar structure to most other metal diborides. At 1200 °C with 70–85% boron, mixtures of PuB4 and PuB6 are formed, with more of the latter as the temperature increases; PuB4 has the tetragonal structure (same as UB4), and PuB6 has cubic structure, same as all hexaborides (CaB6, LaB6 etc.).〔 The most remarkable plutonium boride is arguably PuB100. Its existence 〔 demonstrates the importance of contamination in boride research because as little as 1% of an impurity is capable of changing its crystal structure. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plutonium borides」の詳細全文を読む スポンサード リンク
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