Abstract
Six new rare-earth orthoborates NaBaR(BO3)2, with R = Tb, Dy, Ho, Er, Tm, Lu were synthesized using a multiple-step solid-state reaction. These new orthoborates continue the previously described isostructural lines of three-cation orthoborates NaBaR(BO3)2, by R = Sc, Y, Yb. The structure of synthesized solid compounds is isotypic with the mineral eitelite, Na2Mg(CO3)2, crystallizing in the trigonal system with space group R3. All prepared borates are isostructural, as evidenced by the presence of the same vibration modes in Raman spectra and of the same diffraction peaks in X-ray patterns. The photoluminescence of NaBaTb(BO3)2 have been investigated in a detail.
Highlights
The rare-earth borates have potential applications for laser medium, luminescent and nonlinear optical materials[1,2,3]
We report the synthesis of new rare-earth compounds in NaBaR(BO3)[2] orthoborate family (R = Tb, Dy, Ho, Er, Tm, Lu) using high-temperature solid-state reaction, and continue previously described orthoborates NaBaR(BO3)[2] with R = Sc, Y and Yb
Six new rare-earth orthoborates belonging to NaBaR(BO3)[2] crystal family were synthesized with rare earth elements Tb, Dy, Ho, Er, Tm and Lu, while several other trivalent (3+) cations: La, Ce,Pr, Nd, Eu, Gd were not
Summary
The rare-earth borates have potential applications for laser medium, luminescent and nonlinear optical materials[1,2,3]. Many one- and two cation borates are currently used in photonics[4]. A current area of research is for new materials for photonic dilates using more complex borate crystal compounds. Orthoborate crystals containing three cations are among the most attractive to investigate because of their potential application as a light emitting phosphor for phosphor-converted white light emitting diodes[5] and as a green emitting phosphor for three-dimensional plasma panel[6]. In our earlier study of solid phase formation in the system M2O3-BaO-Na2O-B2O3 (M = Sc, Y) we identified two new borates: NaBaSc(BO3)[2] and NaBaY(BO3)[27-8]. Further investigation in this family resulted in the discovery of new ytterbium-bearing borate NaBaYb(BO3)[29].
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