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A beam of 150-eV electrons falls on a powder nickel sample. Find the two smallest Bragg angles at which reflection takes place, recalling that Ni has an fcc lattice with a cube edge equal to 3.25 Å.

A beam of 150-eV electrons falls on a powder nickel sample. Find the two smallest Bragg angles at which reflection takes place, recalling that Ni has an fcc lattice with a cube edge equal to 3.25 Å.

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25. A beam of 150-eV electrons falls on a powder nickel sample. Find the two smallest Bragg angles at which reflection takes place, recalling that Ni has an fcc lattice with a cube edge equal to 3.25 Å.
Transcribed Image Text:25. A beam of 150-eV electrons falls on a powder nickel sample. Find the two smallest Bragg angles at which reflection takes place, recalling that Ni has an fcc lattice with a cube edge equal to 3.25 Å.
20. A unit cell has the dimensions a = 4 Å, b = 6 Å, c= 8 Å, a = ß = 90°, y = 120°. Determine: a) a*, b*, and c* 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 planes.
Transcribed Image Text:20. A unit cell has the dimensions a = 4 Å, b = 6 Å, c= 8 Å, a = ß = 90°, y = 120°. Determine: a) a*, b*, and c* 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 planes.
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