Consider the tin (Sn)- bismuth (Bi) equilibrium diagram reproduced below. An alloy containing 10wt% Bi is held at a temperature of 200°C 300 271 Liquid 250 232 200 a + Liquid B+Liquid 150 184 138.5C 100 a+B 50 Sn 10 20 30 40 50 60 70 80 90 Bi Weight Bismuth c) What are the proportions (%) of each phase in the alloy? Temperature, C B.

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.