Jump to main content
Jump to site search

Issue 39, 2012
Previous Article Next Article

Synthesis, crystal structure and optical properties of Na2RE(PO4)(WO4) (RE = Y, Tb–Lu)

Author affiliations

Abstract

Phase-pure samples of sodium rare-earth phosphate tungstates Na2RE(PO4)(WO4) (RE = Y, Dy–Lu) and Na2Y(PO4)(WO4):Ln3+ (Ln = Eu, Tb) were obtained by reaction of the respective rare-earth oxide with ammonium hydrogen phosphate with sodium tungstate Na2WO4·2H2O as a flux at 1220 K. According to X-ray single-crystal investigations Na2RE(PO4)(WO4) (RE = Y, Tb–Lu) crystallise orthorhombically in space group Ibca (no. 73) (RE = Y, Z = 8, a = 1799.7(4), b = 1210.2(2), c = 683.82(14) pm, wR2 = 0.040, R1 = 0.037, 661 reflections, 62 parameters). The crystal structure contains non-condensed phosphate and tungstate tetrahedra with the (3 + 3)-coordinate sodium and eight-coordinate rare-earth ions in the voids. Relevant absorption and infrared spectra as well as the fluorescence spectra of Na2Y(PO4)(WO4):Ln3+ (Ln = Eu, Tb) are presented. An FP-LAPW band-structure calculation confirms the assignment of the main absorption as well as the optical band-gap (εcalc = 5.1 eV; εmeas = 5.2(1) eV) of Na2Y(PO4)(WO4).

Graphical abstract: Synthesis, crystal structure and optical properties of Na2RE(PO4)(WO4) (RE = Y, Tb–Lu)

Back to tab navigation

Supplementary files

Publication details

The article was received on 25 Jun 2012, accepted on 02 Aug 2012 and first published on 23 Aug 2012


Article type: Paper
DOI: 10.1039/C2DT31358H
Citation: Dalton Trans., 2012,41, 12121-12128
  •   Request permissions

    Synthesis, crystal structure and optical properties of Na2RE(PO4)(WO4) (RE = Y, Tb–Lu)

    M. Daub, A. J. Lehner and H. A. Höppe, Dalton Trans., 2012, 41, 12121
    DOI: 10.1039/C2DT31358H

Search articles by author

Spotlight

Advertisements