| Abstract
| - Crystals of M2Ti2-xLnx(PO4)3 (M = K+ or Rb+ and Ln = Er3+ or Yb3+) have been grown by high-temperature methods. The langbeinite-type structures of the Rb2Ti1.01Er0.99(PO4)3 and Rb2.05Ti0.81Yb1.19(PO4)3 crystals have been resolved. The evolution with the temperature of Rb2Ti1.01Er0.99(PO4)3 has been studied, finding a decomposition at 1323 K. This crystal shows a second-harmonic generation efficiency similar to that of potassium dihydrogen phosphate.
- We successfully grew langbeinite-type structures containing Ti4+ and Ln3+ ions asM2Ti2-xLnx(PO4)3 crystals (M = K+ or Rb+ and Ln = Er3+ or Yb3+) by high-temperature-solution methods. We took accurate composition measurements of these crystals, payingspecial attention to the lanthanide contents. We resolved the structure of the Rb2Ti1.01Er0.99(PO4)3 crystal and studied the evolution of this structure with the temperature. We foundthat this compound decomposed at 1323 K. We made a preliminary study to check thenonlinear optical properties of these materials, showing that the second-harmonic generationefficiency of the Rb2Ti1.01Er0.99(PO4)3 was at least similar to that of potassium dihydrogenphosphate.
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