Influence of Mg2+ on the mechanical properties of Ammonium tetra fluoro antimonates

Ammonium Tetra Fluoro Antimonate NH4SbF4 (ATFA) , an electro optic crystal has been grown by slow evaporation technique. Powder X-ray diffraction method has been used for structural identification and determination of lattice parameters. Micro hardness studies have been carried out using a Vicker’s diamond pyramid indenter. The variation of micro hardness of pure ATFA and with the addition of metal alkali dopants such as Mg2 + are reported for the first time in this paper. The work hardening coefficient ’n’ is 2.32 for pure ATFA and 1.822 for Mg2+ doped ATFA crystal. This is explained on the basis of dislocations present in the crystal. The yield strength and stiffness constant were also calculated and reported in this paper.