Crystal structures and comparisons of potassium rare-earth molybdates K RE(MoO4)2 (RE = Tb, Dy, Ho, Er, Yb, and Lu)

Saehwa Chong; Samuel Perry; Brian J Riley; Zayne J Nelson

doi:10.1107/S205698902001542X

Crystal structures and comparisons of potassium rare-earth molybdates K RE(MoO₄)₂ (RE = Tb, Dy, Ho, Er, Yb, and Lu)

Acta Crystallogr E Crystallogr Commun. 2020 Nov 27;76(Pt 12):1871-1875. doi: 10.1107/S205698902001542X. eCollection 2020 Dec 1.

Authors

Saehwa Chong¹, Samuel Perry², Brian J Riley¹, Zayne J Nelson¹

Affiliations

¹ Pacific Northwest National Laboratory, Richland, WA 99354, USA.
² Department of Civil and Environmental Engineering and Earth Sciences, University, of Notre Dame, Notre Dame, IN 46556, USA.

Abstract

Six potassium rare-earth molybdates KRE(MoO₄)₂ (RE = Tb, Dy, Ho, Er, Yb, and Lu) were synthesized by flux-assisted growth in K₂Mo₃O₁₀. The crystal structures were determined using single-crystal X-ray diffraction data. The synthesized molybdates crystallize with the ortho-rhom-bic Pbcn space group (No. 60). Trendlines for unit-cell parameters were calculated using data from the current study. The unit-cell parameters a and c increase linearly whereas b decreases with larger RE cations, based on crystal radii. The unit-cell volumes increase linearly and the densities decrease linearly with larger RE cations. The average distances between the RE cations and the nearest O atoms increase with larger cations whereas the average distances of Mo-O and K-O do not show specific trends.

Keywords: lanthanide molybdate; rare-earth molybdate; single-crystal XRD.