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C. Woolley and K. W. Blazey, J. Phys. Chem. Solids, 25, 713 (1964). 18. E. W. Williams and V. Rehn, Phys. Rev. 172, 798 (1968). 19. A. G. Thompson and J. C. Woolley, Can. J. Phys. 45, 255 (1967). 20. A. G. Thompson, M. Cardona, K. L. Shaklee and J. C. Woolley, Phys. Rev. 146, 601 (1966). 21. J. C. Woolley, C. M. Gillett and J. A. Evans, Proc. Phys. Soc. (London) ΊΊ_, 700 (1961) . 22. J. C. Woolley and J. A. Evans, Proc. Phys. Soc. (London) 78, 354 (1961). 23. J. C. Woolley and J. Warner, Can. J.

3) This means that for compounds like GaAs in a single phase field such as the liquid or the solid phase, P = 1 and this means that there are two degrees of freedom. These degrees of freedom of temperature and composition can therefore be varied independently. However, in a two-phase field, where both solid and liquid are found, P = 2 and hence F = 1. In this case if the temperature is chosen the composition of the two phases is defined by the points of intersection of the horizontal line drawn on the temperature against composition phase diagram with the phase boundary lines.

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