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Hardness is an important solid state property(1)which is commonly stu-died to determine the mechanical strength and the breaking strength of the ma-terials.Vickers hardness test and Instron compression testing are the most re-liable methods.The variation of hardness of LHP(PbHPO_4)crystals is deter-
Hardness is an important solid state property (1) which is commonly stu-died to determine the mechanical strength and the breaking strength of the ma-terials.Vickers hardness test and Instron compression testing are the most re-done methods. The variation of hardness of LHP (PbHPO 4) crystals is deter-