الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
The calculated thermal activation energies of ordering transition were 523kj /mole and 163 kjLmole at tc=703 k and tc=714 k respectively also the calculated number of atoms displaced from the equilibrium position n estimated to be 3.32 10 and 9.16 10 at tc =703 k and tc=712 k respectively.