Pressure-volume relations and polymorphism of europium and ytterbium to 30 GPa
Pressure-volume relations and polymorphism of europium and ytterbium to 30 GPa
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铕和镱在 30 GPa 下的压力-体积关系和多晶型
DOI：
10.1088/0305-4608/15/3/010
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
K. Syassen
中科院分区：
文献类型：
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作者：
K. Takemura;K. Syassen
采用室温下30gpa的粉末x射线衍射研究了Eu和Yb的压力-体积关系和高压相变。Eu在12.5 GPa附近发生了从BCC到HCP的结构相变，相对体积变化为4%。Yb中相应的转变开始于26gpa附近，体积不连续为2.4%。在Eu中观察到一个新的致密相，稳定在18到至少27 GPa之间。在0-20 GPa的压力范围内，Eu和Yb都表现出异常大的压缩，这归因于压力诱导的二价和三价4f构型之间的量子混合。还报道了Gd高达20gpa的PV数据。
Pressure-volume relations and high-pressure phase transitions of Eu and Yb have been studied by powder X-ray diffraction up to 30 GPa at room temperature. A structural phase transition from BCC to HCP occurs in Eu near 12.5 GPa with a relative volume change of 4%. The corresponding transition in Yb starts near 26 GPa with a volume discontinuity of 2.4%. A new close-packed phase is observed in Eu which is stable between 18 and at least 27 GPa. In the pressure range 0-20 GPa both Eu and Yb exhibit an anomalously large compression which is attributed to a pressure-induced quantum mixing between divalent and trivalent 4f configurations. Some PV data for Gd up to 20 GPa are also reported.