Crystal Chemistry and Thermodynamics of HREE (Er, Yb) Mixing in a Xenotime Solid Solution

Strzelecki, Andrew C.; Reece, Margaret; Zhao, Xiaodong; Yu, Wendy; Benmore, Chris; Ren, Yang; Alcorn, Christopher; Migdisov, Artaches; Xu, Hongwu; Guo, Xiaofeng

doi:10.1021/acsearthspacechem.2c00052

Crystal Chemistry and Thermodynamics of HREE (Er, Yb) Mixing in a Xenotime Solid Solution

Journal Article · Mon May 02 04:00:00 EDT 2022 · ACS Earth and Space Chemistry

DOI:https://doi.org/10.1021/acsearthspacechem.2c00052· OSTI ID:1878477

Strzelecki, Andrew C. ^[1]; Reece, Margaret ^[2]; Zhao, Xiaodong ^[2]; Yu, Wendy ^[2]; ^[3]; ^[4]; Alcorn, Christopher ^[5]; Migdisov, Artaches ^[5]; Xu, Hongwu ^[6]; ^[2]

Washington State Univ., Pullman, WA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Washington State Univ., Pullman, WA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); City Univ. of Hong Kong, Kowloon (Hong Kong)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Arizona State Univ., Tempe, AZ (United States)

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. Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); Los Alamos National Laboratory (LANL); Washington State University; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-06CH11357; 89233218CNA000001

OSTI ID:: 1878477

Journal Information:: ACS Earth and Space Chemistry, Journal Name: ACS Earth and Space Chemistry Journal Issue: 5 Vol. 6; ISSN 2472-3452

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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