High-pressure investigations of yttrium(III) oxoarsenate(V): Crystal structure and luminescence properties of Eu3+-doped scheelite-type Y[AsO4] from xenotime-type precursors

Crystal chemistry and miscibility of chernovite-(Y), xenotime-(Y), gasparite-(Ce) and monazite-(Ce) from Mt. Cervandone, Western Alps, Italy

“…A correlation among the volumes of (P,As)-tetrahedra and the A -site polyhedra is also shown by the synthetic REE T O 4 compounds, of which structural models are reported in the Inorganic Crystal Structure Database (Bergerhoff et al , 1987). A comparative analysis of the structural parameters of synthetic REE-bearing phosphates (YPO 4 , LaPO 4 , CePO 4 , NdPO 4 , TbPO 4 , HoPO 4 , DyPO 4 , YbPO 4 and LuPO 4 – Ni et al , 1995) and their As-dominant end-members (YAsO 4 – Ledderboge et al , 2018; LaAsO 4 – Kang and Schleid, 2005; CeAsO 4 – Brahim et al , 2002; NdAsO 4 – Schmidt et al , 2005; TbAsO 4 – Long and Stager, 1977; HoAsO 4 – Schmidt et al , 2005; DyAsO 4 – Long and Stager, 1977; YbAsO 4 –Kang et al , 2005; and LuAsO 4 – Lohmüller et al , 1973) has been carried out. Given the same elemental composition of the REE-bearing A site, the volume of its coordination polyhedron is different in phosphates and arsenates, being always lower in phosphates, pointing out the dominant role played by the TO 4 structural units ( ≈ 2.4 Å 3 for AsO 4 and ≈ 1.8 Å 3 for PO 4 ) in controlling most of the structural features of the REE T O 4 compounds.…”

Synthesis under high pressure: crystal structure and properties of cubic Dy36O11F50[AsO3]12 ∙ H2O

“…Regardless of the oxidation state at the involved arsenic atoms, rare-earth metal oxoarsenates can serve well as either host materials or concentrated phosphors for lumogenious applications. This holds for the monazite -, xenotime -, and scheelite -type oxoarsenates(V) RE [AsO 4 ] ( Schäfer and Will, 1971 ; Lohmüller et al, 1973 ; Long and Stager, 1977 ; Schäfer et al, 1979 ; Brahim et al, 2002 ; Kang et al, 2005a ; Kang, 2009 ; Kang and Schleid, 2005 ; Schmidt et al, 2005 ; Hartenbach et al, 2006 ; Golbs et al, 2009 ; Metzger, 2012 ; Metzger et al, 2016 ; Ledderboge et al, 2018 ; Goerigk, 2021 ; Adala et al, 2022 ) ( RE = rare-earth metal: Sc, Y, La, Ce–Lu), where O 2− -to-As 5+ ligand-to-metal charge-transfer processes (LMCT) within the tetrahedral [AsO 4 ] 3− anions have a beneficial impact on the necessary energy transfer as well as for the oxoarsenates(III) RE [AsO 3 ] and RE 4 [As 2 O 5 ] 2 [As 4 O 8 ] ( Ben Hamida et al, 2005 ; Kang, 2009 ; Kang and Schleid, 2006 ; Ben Hamida, 2007 ; Metzger, 2012 ; Metzger et al, 2012 ; Ledderboge et al, 2014 ; Ledderboge, 2016 ; Locke et al, 2023 ), where the O 2− -to-As 3+ LMCT is supported by the lone-pair antenna at the trivalent arsenic centers. The latter occur as ψ 1 -tetrahedral [AsO 3 ] 3− groups either isolated in the first cases (Pb[SeO 3 ]- or K[ClO 3 ]-type RE [AsO 3 ]) or vertex-condensed to di- and tetranuclear anions ( pyro -[As 2 O 5 ] 4− and cyclo- [As 4 O 8 ] 4− ) for the latter ones ( RE 4 [As 2 O 5 ] 2 [As 4 O 8 ] ≡ 2 × RE 2 As 4 O 9 ).…”

The Triclinic Lanthanoid(III) Halide Oxidoarsenates(III) Sm3Cl2[As2O5][AsO3] and Tm3Br2[As2O5][AsO3]

“…They were found crystallizing either in the monazite ‐type ( Ln = La – Nd) or the xenotime ‐type ( Ln = Y, Sm – Lu) and even the scheelite ‐type structure became evident as high‐pressure modification , . Rare‐earth metal containing compounds with complex oxidoanions, such as oxidoarsenates, are always a promising material class for possible luminescence properties due to their ligand‐to‐metal charge‐transfer effects …”

“…[1,7] Rare-earth metal containing compounds with complex oxidoanions, such as oxidoarsenates, are always a promising material class for possible luminescence properties due to their ligand-to-metal charge-transfer effects. [8] While oxidophosphates(III) of the rare-earth metals are not known up to now, the first ternary, halide-free rareearth metal(III) oxidoarsenates(III) were reported for the first time in 2005 with the empirical formula…”