Crystal Chemistry and Thermodynamics of HREE (Er, Yb) Mixing in a Xenotime Solid Solution
Crystal Chemistry and Thermodynamics of HREE (Er, Yb) Mixing in a Xenotime Solid Solution
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DOI：
10.1021/acsearthspacechem.2c00052
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发表时间：
2022-05
影响因子：
3.4
通讯作者：
A. Strzelecki;Margaret E. Reece;Xiaodong Zhao;Wendy Yu;C. Benmore;Yang Ren;C. Alcorn;A. Migdisov;Hongwu Xu;Xiaofeng Guo
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文献类型：
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作者：
A. Strzelecki;Margaret E. Reece;Xiaodong Zhao;Wendy Yu;C. Benmore;Yang Ren;C. Alcorn;A. Migdisov;Hongwu Xu;Xiaofeng Guo
稀土元素（RE），15种天然存在的镧系元素加上钇和钪，在现代生活中无处不在，因为它们是许多先进设备和技术的关键组成部分。然而，对稀土元素的需求并不相等，重稀土元素（HREE）的需求更高。异钇矿（HREEPO 4）是重要的重稀土矿石矿物，是全球重要的重稀土资源。大部分的晶体学和热力学性质的磷钇矿端元已经阐明了量热，溶解度和高压研究。然而，在自然系统中，端元很少遇到，相反，稀土固溶体更常见。本文采用X射线荧光光谱、同步辐射X射线粉末衍射和Rietveld分析等实验手段，对合成的Er（x）Yb（1-x）PO 4二元磷钇矿固溶体的晶体化学、HREE混合热力学、高温材料行为和热化学进行了表征，傅里叶变换红外光谱结合衰减全反射、拉曼光谱、热重分析结合差示扫描量热法和高温氧化物熔滴溶液量热法。我们的研究结果揭示了天然磷钇矿的形成，并为其作为热涂层材料的工业应用奠定了基础。
Rare earth elements (REEs), the 15 naturally occurring lanthanides plus yttrium and scandium, are ubiquitously used in modern life as they are critical components of many advanced devices and technologies. However, the demand for REEs is not equal, with the heavy rare earth elements (HREEs) having a higher demand. Xenotime (HREEPO4) is an important HREE ore mineral and globally is an economical source of HREE. Most of the crystallographic and thermodynamic properties of xenotime endmembers have been elucidated by calorimetric, solubility, and high-pressure studies. Yet, in natural systems, endmembers are rarely encountered, and instead, REE solid solutions are more commonly observed. In this work, we characterize the crystal chemistry, thermodynamics of HREE mixing, and high-temperature material behaviors and thermochemistry of a synthetic erbium (Er)–ytterbium (Yb) binary xenotime solid solution (Er(x)Yb(1–x)PO4) using a suite of experimental techniques, including X-ray fluorescence spectroscopy, synchrotron X-ray powder diffraction implemented with Rietveld analysis, Fourier transform infrared spectroscopy coupled with attenuated total reflectance, Raman spectroscopy, thermogravimetric analysis coupled with differential scanning calorimetry, and high-temperature oxide melt drop solution calorimetry. Our results shed light on the formation of natural xenotimes and lay the foundation for their industrial applications as thermal coating materials.