Synthesis of large Rare Earth Element Germanate Pyrochlore Single Crystals at High-Pressure
2019
We report the successful synthesis of up to mm-size single crystals of the pyrochlore rare earth element (RE) germanates Dy2Ge2O7 and Ho2Ge2O7. Crystals were grown from oxide starting materials with the addition of 0.2 to 0.9 weight% H2O in sealed AuPd-capsules at 7.7 GPa and 1200 – 1400 °C with a Belt-type high-pressure apparatus. With the use of seed crystals, regular, octahedrally shaped crystals up to a size of 0.9 mm edge-length could be recovered.
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