Question
Asked Jan 30, 2020
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Out of the following defects, which one must occur in pairs for ionic compounds with 1:1 stoichiometries?

Group of answer choices
 
A:Schottky
B:Substitution
C:Frenkel
D:Interstitial
 

Consider this x-ray diffraction pattern for the mineral magnetite (Fe3O4) and Bragg's Law.  Which of the following statements is true?  (HINTs:  Since all of these peaks result from the same x-ray scan, the same x-ray wavelength applies to all peaks in this pattern.  You may also assume that the same order (n) applies to all peaks in this pattern.)

 

Group of answer choices
The atom plane spacing (d) that gives the (220) peak is smaller than that which gives the (400) peak.
If this sample was scanned with an x-ray beam of shorter wavelength, the peaks would be in a different order.
The labeled peak that represents the largest atom plane spacing (d) is the (440) one.
The atom plane spacing (d) that gives the (400) peak is larger than that which gives the (511) peak.
(311)
(440)
(220)
(511)
(400)
(422)
10
20
30
50
60
70
40
2-theta (deg.)
FIGURE I: The XRD patterns of magnetite Fe, O,.
Intensity
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(311) (440) (220) (511) (400) (422) 10 20 30 50 60 70 40 2-theta (deg.) FIGURE I: The XRD patterns of magnetite Fe, O,. Intensity

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