Determination of triple points in the phase diagram of praseodymium.
Determination of triple points in the phase diagram of praseodymium.
复制标题
镨相图中三相点的测定。
DOI：
10.1103/physrevb.52.134
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Holzapfel
中科院分区：
文献类型：
--
作者：
Zhao;Porsch;Holzapfel
采用外部加热的金刚石对顶盒装置，通过原位能量色散X射线衍射，沿着Pr（II）（fcc）、Pr（III）（扭曲的fcc）和Pr（IV）（α-铀型结构）之间的相界，研究了压力高达23 GPa、温度高达573 K的镨的相图。沿着Pr（II）（fcc）、Pr（III）（扭曲的fcc）和Pr（IV）（α-铀型结构）。这三个相的三相点位于21 GPa和537 K附近，代表在过渡到高压相Pr（IV）时Pr（II）和Pr（III）之间的明显二级相变的终点。结合Pr在室温下的压缩数据，本研究将P-T相图扩展到熔化线。
The phase diagram for praseodymium under pressures up to 23 GPa and temperatures up to 573 K is studied by in situ energy-dispersive x-ray diffraction with an externally heated diamond-anvil cell apparatus along the phase boundaries between Pr(II) (fcc), Pr(III) {distorted fcc), and Pr(IV) (a-uraniumtype structure). The triple point of these three phases is located around 21 GPa and 537 K, representing the end point of the apparently second-order phase transition between Pr{II) and Pr(III) at the transition to the high-pressure phase Pr(IV). Together with the compression data for Pr at ambient temperature, the present study extends the P-T phase diagram up to the melting lines.