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Predicting from first principles the chemical evolution of crystalline compounds due to radioactive decay: The case of the transformation of CsCl to BaCl

机译:根据第一性原理预测由于放射性衰变而产生的结晶化合物的化学演化:以CsCl转变为BaCl的情况

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In this Brief Report, we use density functional theory to predict the existence of a heretofore unobserved crystalline compound, BaCl. and additionally predict it to be isostructural with NaCl (rocksalt). Due to the chemistry of Ba, which strongly prefers a 2+ charge state, compounds where Ba nominally exhibits a +1 charge (e.g., BaCl) are unlikely to be synthesized via conventional solid-state approaches. However, in considering the chemical evolution of ~(137)Cs to ~(137)Ba via β~- radioactive decay in a model nuclear waste form CsCl, we find that BaCl may be indeed relevant. The mechanical stability of this surprising structure is confirmed through examination of its elastic constants and phonon-dispersion relations. We have also analyzed the chemical bonding of rocksalt BaCl and found it to exhibit a complex mixture of ionic, metallic, and covalent characters. From our results, we demonstrate that the chemical evolution of crystalline structures due to radioactive decay may be a viable synthesis route for unforeseen materials with interesting properties.
机译:在这份简要报告中,我们使用密度泛函理论来预测迄今未观察到的结晶化合物BaCl的存在。并预测它与NaCl(岩盐)是同构的。由于Ba的化学性质,Ba非常倾向于2+电荷状态,因此Ba名义上显示+1电荷的化合物(例如BaCl)不太可能通过常规的固态方法合成。但是,考虑到在模型核废料CsCl中〜(137)Cs通过β〜-放射性衰变从〜(137)Cs演化为〜(137)Ba的过程,我们发现BaCl可能确实相关。通过检查其弹性常数和声子-色散关系,可以确定这种令人惊讶的结构的机械稳定性。我们还分析了岩盐BaCl的化学键,发现它具有离子,金属和共价特征的复杂混合物。从我们的结果中,我们证明了由于放射性衰变而导致的晶体结构的化学演化可能是具有令人感兴趣的特性的不可预见材料的可行合成途径。

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