19. Construct the reciprocal lattice for a two-dimensional lattice in which a- 1.25 A, b= 2.50 A, and y = 120°. 20. A unit cell has the dimensions a= 4 A, b= 6 A, e = 8 A, 2 = ß = 90°, y = 120°. Determine: a) a", b*, and e* for the reciprocal cell. b) The volume of the real and reciprocal unit cells. c) The spacing between the (210) planes. d) The Bragg angle 0 for reflection from the above nlanes
19. Construct the reciprocal lattice for a two-dimensional lattice in which a- 1.25 A, b= 2.50 A, and y = 120°. 20. A unit cell has the dimensions a= 4 A, b= 6 A, e = 8 A, 2 = ß = 90°, y = 120°. Determine: a) a", b*, and e* for the reciprocal cell. b) The volume of the real and reciprocal unit cells. c) The spacing between the (210) planes. d) The Bragg angle 0 for reflection from the above nlanes
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Transcribed Image Text:19. Construct the reciprocal lattice for a two-dimensional lattice in which a = 1.25 Å,
b= 2.50 Å, and y = 120°.
20. A unit cell has the dimensions a= 4 Å, b= 6 Å, e = 8 A, a = ß = 90°, y = 120°.
Determine:
a) a", b*, and e* for the reciprocal cell.
b) The volume of the real and reciprocal unit cells.
c) The spacing between the (210) planes.
d) The Bragg angle 0 for reflection from the ahove nlanes
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