Abstract
The high-quality 20 mol% Ho3+:BaY2F8 single crystal has been grown by the Czochralski method. The deformation, hardness and Young's modulus of Ho3+:BaY2F8 single crystals have been studied by nanoindentation measuring method. The load-depth of Ho3+:BaY2F8 single crystals were measured under different maximum loads (4–150 mN). The experimental results revealed that the plastic deformation component governs Ho3+:BaY2F8 single crystals at the indentation loads of 4–140 mN. The slip lines in <010> directions appeared at above 30 mN indentation load and increased with indentation load increasing. With the load exceeding 140 mN, a microcrack was detected around the indentation. It is found that materials pile-up and propagation of dislocations dominate the deformation mechanism, where no phase transition occurs. The hardness and Young's modulus are 3.16 ± 0.08 GPa and ~106.9 GPa, respectively. To our best knowledge, the nanoindentation behavior of Ho3+:BaY2F8 single crystal is reported for the first time.
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