Epitaxial Overgrowth of LiKSO₄ on β–K₂SO₄ Single Crystals

(3+1)-Dimensional Modulated Structure and Tb3+-Doped Luminescence for Vanadate Na3La(VO4)2

“…Vanadates are a group of the most important inorganic oxysalts with lower resultant temperature and the vanadate-based phosphors have been drawn more attention in the last 10 years, including such downconversion phosphors as La 7 O 6 (VO 4 ) 3 :RE 3+ (RE = Eu, Sm), Ca 3 Sr 3 (VO 4 ) 4 :Eu 3+ ,Al 3+ , and Ba 3 La­(VO 4 ) 3 :Eu 3+ and upconversion phosphors YVO 4 : Yb 3+ , Er 3+ , K 3 Y­(VO 4 ) 2 :Yb 3+ /Ln 3+ (Ln = Ho, Er, Tm), and Ca 5 Mg 4 (VO 4 ) 6 :Yb 3+ , Er 3+ . β-K 2 SO 4 is characterized by a very flexible structure, in which K can be substituted by other alkali metal atoms and the SO 4 group could be submitted by PO 4 to form various compounds. − In our previous studies, β-K 2 SO 4 -type phosphate Na 3 La­(PO 4 ) 2 was synthesized and single-crystal X-ray diffraction (SC-XRD) determination reveals that it crystallizes in the modulated structure with the super space group Pca 2 1 (0β0)­000 . The structure of analogous vanadate Na 3 La­(VO 4 ) 2 was first characterized by Vlasse with a conventional orthorhombic space group Pca 2 1 .…”