Tuning the melting point and phase stability of rare-earth oxides to facilitate their crystal growth from the melt

Tuning the melting point and phase stability of rare-earth oxides to facilitate their crystal growth from the melt
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调节稀土氧化物的熔点和相稳定性,以促进其晶体从熔体中生长

DOI:
10.1007/s40145-022-0625-z
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发表时间:
2022
影响因子:
16.9
通讯作者:
Zhuravleva, Mariya
Zhuravleva, Mariya
中科院分区:
材料科学1区
文献类型:
--
作者:
Pianassola, Matheus;Anderson, Kaden L.;Safin, Joshua;Agca, Can;McMurray, Jake W.;Chakoumakos, Bryan C.;Neuefeind, Jöerg C.;Melcher, Charles L.;Zhuravleva, Mariya

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通过成分工程调整稀土 (RE) 三氧化物晶体的结构稳定性和熔点,可以克服生长稀土 (RE) 三氧化物晶体的挑战。这项工作有助于高熵氧化物晶体生长领域的进步。通过空气动力悬浮样品的原位高温中子衍射观察到,仅含有少量稀土 (Lu,Y,Ho,Yb,Er)2O3 的化合物在从熔体冷却后保持立方 C 型结构。另一方面,具有小稀土和大稀土混合物的化合物(Lu,Y,Ho,Nd,La)2O3结晶为主要C型相与不稳定次要相的混合物。 (Lu,Y,Ho,Nd,La)2O3和(Lu,Y,Gd,Nd,La)2O3的晶体通过微下拉(mPD)方法生长为单斜B型相,而(Lu,Y,Ho,Yb,Er)2O3粉末在铱铼坩埚的最高工作温度下不熔化。两种生长晶体的熔点最小化归因于阳离子尺寸的不匹配。电子探针微量分析表明,晶体中的一般元素偏析行为取决于成分。
The challenge of growing rare-earth (RE) sesquioxide crystals can be overcome by tailoring their structural stability and melting point via composition engineering. This work contributes to the advancement of the field of crystal growth of high-entropy oxides. A compound with only small REs (Lu,Y,Ho,Yb,Er)2O3maintains a cubic C-type structure upon cooling from the melt, as observed viain-situhigh-temperature neutron diffraction on aerodynamically levitated samples. On the other hand, a compound with a mixture of small and large REs (Lu,Y,Ho,Nd,La)2O3crystallizes as a mixture of a primary C-type phase with an unstable secondary phase. Crystals of compositions (Lu,Y,Ho,Nd,La)2O3and (Lu,Y,Gd,Nd,La)2O3were grown by the micro-pulling-down (mPD) method with a single monoclinic B-type phase, while a powder of (Lu,Y,Ho,Yb,Er)2O3did not melt at the maximum operating temperature of an iridium-rhenium crucible. The minimization of the melting point of the two grown crystals is attributed to the mismatch in cation sizes. The electron probe microanalysis reveals that the general element segregation behavior in the crystals depends on the composition.
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