(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

Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter34: Particle Size Determination
Section: Chapter Questions
Problem 34.6QAP
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 If you are told that a certain metal element has a simple cubic unit cell structure, what additional information do you need in order calculate the atomic radius for that element?  Select all correct answers.  (You can assume that you already have the information necessary to do metric unit prefix conversions.)

Group of answer choices
A:number of particles in the unit cell
B:the relationship between the unit cell edge length and atomic radius
C:Avogadro's number
D:the element's enthalpy of fusion
E:element identity or molar mass
F:density (g/cm3)
 

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
Transcribed Image Text:(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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