The metal niobium crystallizes in a body centered cubic unit cell. ?
2020-08-10 9:59 pm
The metal niobium crystallizes in a body centered cubic unit cell. When X-rays with λ = 0.8302 Å are used, the second-order Bragg reflection from a set of parallel planes in a(n) niobium crystal is observed at an angle θ = 14.57°. If the spacing between these planes corresponds to the unit cell length (d = a), calculate the edge length of the niobium unit cell.
回答 (2)
2020-08-11 3:29 am
Bragg's law: 2 d sinθ = n λ
For second-order, n = 2:
2 d sinθ = 2 λ
d = λ / sinθ = 0.8302 / sin14.57° Å = 3.300 Å
The edge length of the niobium unit cell, a = d = 3.300 Å
For second-order, n = 2:
2 d sinθ = 2 λ
d = λ / sinθ = 0.8302 / sin14.57° Å = 3.300 Å
The edge length of the niobium unit cell, a = d = 3.300 Å
2020-08-11 2:56 am
did you try looking up bragg reflection?
https://www.britannica.com/science/Bragg-reflection
note the relationship between dsinθ and wavelength and "d" the spacing between the lines (this is your unit cell edge length)
https://www.britannica.com/science/Bragg-reflection
note the relationship between dsinθ and wavelength and "d" the spacing between the lines (this is your unit cell edge length)
收錄日期: 2021-04-24 07:59:32
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