Synthesis and structural study of Rb2FeZr(PO4)3 phosphate with langbeinite structure

Cesium and Its Analogs, Rubidium and Potassium, in Rhombohedral [NaZr2(PO4)3 Type] and Cubic (Langbeinite Type) Phosphates: 1. Crystal-Chemical Studies

“…In the structures of Rb 2 FeZr(PO 4 ) 3 [34] and previously described [24] K 2 FeZr(PO 4 ) 3 , the phosphorus tetrahedra are deformed similarly: The maximal scatter D in the bond length is 0.04 A, and the O3P3O bond angles are close to the ideal tetrahedral angle of 109.5o. The metal3oxygen octahedra (Fe/Zr)O 6 are somewhat more distorted (D = 0.08 and 0.02 A, respectively).…”

“…For this purpose, we used the calculated atomic coordinates, bond angles, and selected interatomic distances in the phosphates K 2 PrZr(PO 4 ) 3 [33] and Rb 2 FeZr(PO 4 ) 3 [34], and also in their analogs K 2 YZr(PO 4 ) 3 [25] and K 2 FeZr(PO 4 ) 3 [24]. The experimental results are given in Tables 2 and 3 and in Fig.…”

Synthesis and crystal structure of langbeinite related mixed‐metal phosphates K1.822Nd0.822Zr1.178(PO4)3 and K2LuZr(PO4)3

“…Compounds with the general composition K 2 LnZr(PO 4 ) 3 (Ln= Pr, Gd and Y) were structurally characterized on the basis of the X-ray powder diffraction. The solid state syntheses and calculated cell parameters for langbeinite related phosphates containing the other lanthanides were reported by Trubach et al [3]. We report here the synthesis and structural characterization of two phosphates K 1.822 Nd 0.822 Zr 1.178 (PO 4 ) 3 (KNdZrP) and K 2 LuZr(PO 4 ) 3 (KLuZrP) which are isostructural to langbeinite mineral K 2 Mg 2 (SO 4 ) 3 [4].…”

“…Most of them were obtained using the solid state technique. Zirconium forms the langbeinites in a pair with small framework cations K 2 FeZr(PO 4 ) 3 [1] as good as with large lanthanide cations K 2 LnZr(PO 4 ) 3 , Ln= Ce-Lu, Y [2,3]. Compounds with the general composition K 2 LnZr(PO 4 ) 3 (Ln= Pr, Gd and Y) were structurally characterized on the basis of the X-ray powder diffraction.…”

Equilibrium langbeinite-related phosphates Cs1 + x Ln x Zr2 − x (PO4)3 (Ln = Sm–Lu) in the melted systems Cs2O–P2O5–LnF3–ZrF4

“…For sodium, Na 2 MTi(PO 4 ) 3 (M = Fe, Cr) were obtained and characterized by Isasi & Daidouh (2000), while the group of potassium-containing langbeinites is the largest: KTi 2 (PO 4 ) 3 (Masse et al, 1972), K 2 Ti 2 (PO 4 ) 3 (Leclaire et al, 1989), K 1 + x Ti 2 À y Al y (PO 4 ) 3 (Slobodyanik et al, 1991), K 2 CrTi(PO 4 ) 3 (Boudjada & Perret, 1977;Norberg, 2002), A 2 MTi(PO 4 ) 3 , A = K, Rb, Tl; M = Cr, Fe (Perret & Boudjada, 1979), K 2 VTi (PO 4 ) 3 (Rangan & Gopalakrishnan, 1994), K 2 MTi(PO 4 ) 3 , M = Er, Yb, Y (Norberg, 2002), K 2 M 0.5 Ti 1.5 (PO 4 ) 3 , M = Mn, Co, Ni Ogorodnyk et al, 2007), K 2 MZr(PO 4 ) 3 , M = Y, Gd (Wulff et al, 1992), K 2 FeZr(PO 4 ) 3 (Orlova et al, 2003), K 2 LnZr(PO 4 ) 3 , Ln = Ce-Lu (Trubach et al, 2004b), K 2 BiHf(PO 4 ) 3 (Losilla et al, 1998) (Lajmi et al, 2003). Rubidium-containing langbeinites are much more scarce: Rb 2 FeZr(PO 4 ) 3 (Trubach et al, 2004a), Rb 2 YbTi(PO 4 ) 3 and Rb 2 Yb 0.32 Ti 1.68 (PO 4 ) 3 (Gustafsson et al, 2005), Rb 2 Mg 0.5 Zr 1.5 (PO 4 ) 3 (Orlova et al, 2005), Rb 2 YTi(PO 4 ) 3 (Gustafsson et al, 2006). Cs 2 Mg 0.5 Zr 1.5 (PO 4 ) 3 (Orlova et al, 2005), however, is the only example with caesium cations in the cavities.…”