无公度钾中的一维链“熔化”
One-dimensional chain "melting" in incommensurate potassium
摘要：
在19和54 GPa之间，钾具有复杂的复合物无公度的主-客体结构，其在此压力范围内经历两个内相变。这些主体-客体相的温度依赖性进一步复杂化，在其客体链中的有序-无序转变的开始。在这里，我们报告的单晶，准单晶，和粉末同步辐射X射线衍射测量这种有序无序现象在无公度钾到47 GPa和750 K。在22 GPa的压力范围内，可以清楚地看到所谓的链“熔化”转变，并且划分有序相和无序相的相边界的斜率有显著的变化，其中之一是由客体结构中的相内转变引起的。
英文摘要：
Between 19 and 54 GPa, potassium has a complex composite incommensurate host-guest structure which undergoes two intraphase transitions over this pressure range. The temperature dependence of these host-guest phases is further complicated by the onset of an order-disorder transition in their guest chains. Here, we report single crystal, quasi-single crystal, and powder synchrotron X-ray diffraction measurements of this order-disorder phenomenon in incommensurate potassium to 47 GPa and 750 K. The so-called chain "melting" transition is clearly visible over a 22 GPa pressure range, and there are significant changes in the slope of the phase boundary which divides the ordered and disordered phases, one of which results from the intraphase transitions in the guest structure.
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