ChemInform Abstract: SYNTHESIS OF ACID POLYPHOSPHATES OF RARE EARTH METALS AND STRUCTURE OF ERBIUM ACID POLYPHOSPHATE (ERH(PO3)4)

Abstract

Eine Mischung aus H3PO4 und den Oxiden der Seltenerdmetalle Ln2O3 (Ln: Sm bis Er), in der das Verhältnis P:Ln = 15:1 beträgt, wird mehrere Tage auf 150 bis 500°C erhitzt.

The Networks of Acidic Phosphate Anions

“…The internal arrangement inside a layer is shown by the second figure representing an isolated layer in projection along the a direction. Figures 6.26 and 6.27 give representations of the anionic layers observed in ErH(P03)4 [21]. In this arrangement two types of long chains coexist.…”

“…The arrangement of the anionic layers in ErH(P0 3 ) 4[21] seen in projection along the b direction. The drawing conventions are identical to those ofFigure 6.24.…”

“…Projection along the a direction of an isolated anionic layer of ErH(PC>3)4[21]. The drawing conventions are identical to those ofFigure 6.24.…”

Synthesis, crystal structure, optical and thermal properties of lanthanide hydrogen-polyphosphates Ln[H(PO3)4] (Ln = Tb, Dy, Ho)

“…4,7,14 Since those are parity forbidden, they only become allowed by admixture of states of the opposite parity. 17 4 ] was solved from singlecrystal data. 4,7 Acid polyphosphates with the sum formula Ln[H(PO 3 15 in the triclinic space group P1.…”

“…12,13 Despite the rather low emission, a good colour rendering can be achieved. 17 With regard to optical applications, both the spectroscopic properties and the thermal stability of the host lattice are important characteristics. 16 Surprisingly, acid polyphosphates of the elements at the origin of the lanthanide row (La, Pr, Nd) and at the end (Tm, Yb) have not been observed yet.…”