Journal of Metals, Materials and Minerals

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Carnallite crystals have been synthesized from brine solutions at room temperature (23C) by solvent evaporation growth technique to show the effect of the concentration of potassium chloride (KCl) and magnesium chloride (MgCl2) on the growth, structural and mechanical properties of the crystal. Transparent and pseudo-hexagonal shape carnallite crystals with the dimension of 4 5 2 mm to 16 13 3 mm were grown. The crystals were characterized by powder X-ray diffraction and the lattice parameters were found to be a = 9.598 b = 16.141and c = 22.519 space group: Pnna, Z: 12, ? = ? = ? = 90 with the unit cell volume, V = 3488.67sup>3. The lattice parameters are found to be in good agreement with the standard values and the structure of the crystal is orthorhombic. A Vickers micro hardness test was carried out to determine the hardness number and work hardening coefficient of the carnallite crystals.

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