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In view of discrepancies in the available information on the hardness of lithium niobate, a systematic study of the hardness has been carried out. Measurements have been made on two pure lithium niobate crystals with different growth origins, and a Fe-doped sample. The problem of load variation of hardness is examined in detail. The true hardness of LiNbO 3 is found to be 630 ± 30 kg/mm 2. The Fe-doped crystal has a larger hardness of 750 ± 50 kg/mm 2 .

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