氟化钙的高压高温phase diagram的经典原子模拟
The high-pressure high-temperature phase diagram of calcium fluoride from classical atomistic simulations
摘要：
我们研究了氟化钙（CaF 2）在压力下的相图，使用经典的分子动力学模拟进行了一个简单的两两原子间的Born-Mayer-Huffman形式的潜力。我们在0 < P < 20 GPa和0 < T < 4000 K条件下获得的结果揭示了丰富的多相边界，包括不同的晶体，超离子和液相，我们为所有这些提供了准确的参数化。有趣的是，我们预测了在6 < P < 8 GPa和1500 < T < 2750 K的窄的和实验可达到的热力学范围内存在三个特殊的三相点（即固-固-超离子、固-超离子-超离子和超离子-超离子-液体共存状态）。此外，我们研究的作用，短程排斥（SR）和长程吸引（LA）原子相互作用中的熔化线的预测与发现SR钙F和LA F-F的贡献是最具决定性的。
英文摘要：
We study the phase diagram of calcium fluoride (CaF2) under pressure using classical molecular dynamic simulations performed with a simple pairwise interatomic potential of the Born-Mayer-Huggings form. Our results obtained under conditions 0 < P < 20 GPa and 0 < T < 4000 K reveal a rich variety of multi-phase boundaries involving different crystal, superionic and liquid phases, for all which we provide an accurate parametrization. Interestingly, we predict the existence of three special triple points (i.e. solid-solid-superionic, solid-superionic-superionic and superionic-superionic-liquid coexisting states) within a narrow and experimentally accessible thermodynamic range of 6 < P < 8 GPa and 1500 < T < 2750 K. Also, we examine the role of short-ranged repulsive (SR) and long-ranged attractive (LA) atomic interactions in the prediction of melting lines with the finding that SR Ca-F and LA F-F contributions are most decisive.
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