1- Calculate the volume of one unit cell in fcc silver. Give answer in units of

Question

1- Calculate the volume of one unit cell in fcc silver. Give answer in units of nm3 and in cm3.???

2-How many unit cells are contained in a 30 cm3 block of fcc silver????

3-Sketch the (2?1) plane and its intercepts????

4-All unit cells, no matter the shape, have the same lattice-point positions for the eight cell corners. Sketch a

unit cell and label the cell corner positions????

5-Starting from the origin, list the first three lattice points (including the 000 point) lying on the [121]

direction in the fcc lattice. Illustrate your answer with a sketch showing enough unit cells to show where the

three points are.?????????

6-. a) Sketch the unit cell of a bcc metal (which has an atom placed at each lattice point) and shade in the

(010) plane. Draw just one unit cell. This plane intersects the centers of how many atoms in one unit cell????

7- Repeat part (a) except use the (020) plane. Again, just one unit cell.?????

Explanation / Answer

1) each unit cell has 8 corner atoms. each corner atom exists in 8 adjacent cells. so 1/8 of each corner atom exists in any given cell. 8 x 1/8 = 1 atom / cell from the corners Each cell has 6 faces. Each face of any given cell has 1 atom right in the center of the face. each face atom exists in 2 cells.. So 1/2 of each face atom exists in any given unit cell... 6 x 1/2 = 3 so there are 4 atoms / cell... 1 from the corners and 3 from the faces. *** edge lenght of any given cell **** the faces of any given cell are arranged like the "5" side on a die. (a single dice) right? like this

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