Question

Consider the powder X-ray diffraction data collected at room temperature using an X-ray wavelength of 1.54 Ã…. 20Â° (degrees) Polymorph B Polymorph C Polymorph C Based on the tick marks for polymorphs B and C, which polymorph(s) is/are present? What can you then deduce about the phase transition between these polymorphs? Polymorph C is corundum (alpha-Al2O3) Ruby Cr-doped Al2O3. What differences would you expect in the diffraction pattern for ruby compared to corundum (consider position, intensity, width, absences)? If these data were collected using an X-ray wavelength of 0.7107 Ã…, describe the differences you would expect in the powder diffraction pattern. The peak marked by an asterisk (*) does not match the tick marks for polymorphs A, B, and C, and must be from an impurity phase. Calculate the d-spacing for the peak. If the peak # = the 200 reflection cubic phase, estimate the lattice parameter of the impurity. (CHES14 or bonus) If this impurity phase has a coefficient of thermal expansion of 20 x 10^-6 /K, how much would you expect the peak to move when the sample was heated from 0Â°C to 100Â°C?

Name: consider the powder x ray diffraction dan collected room temperature using an x ray wavelength ofa 154a llul 20 degrees polymorph polymorph polymcroh based on the tick marks for polymorphs b 61502
Uploaded: 2024-04-04T12:09:26-08:00
Duration: 3 min 40 s
Channel: Numerade
Description: consider the powder x ray diffraction dan collected room temperature using an x ray wavelength ofa 154a llul 20 degrees polymorph polymorph polymcroh based on the tick marks for polymorphs b 61502

          Consider the powder X-ray diffraction data collected at room temperature using an X-ray wavelength of 1.54 Ã….
20Â° (degrees)
Polymorph B Polymorph C Polymorph C
Based on the tick marks for polymorphs B and C, which polymorph(s) is/are present?
What can you then deduce about the phase transition between these polymorphs? Polymorph C is corundum (alpha-Al2O3) Ruby Cr-doped Al2O3. What differences would you expect in the diffraction pattern for ruby compared to corundum (consider position, intensity, width, absences)?
If these data were collected using an X-ray wavelength of 0.7107 Ã…, describe the differences you would expect in the powder diffraction pattern. The peak marked by an asterisk (*) does not match the tick marks for polymorphs A, B, and C, and must be from an impurity phase. Calculate the d-spacing for the peak. If the peak # = the 200 reflection cubic phase, estimate the lattice parameter of the impurity. (CHES14 or bonus) If this impurity phase has a coefficient of thermal expansion of 20 x 10^-6 /K, how much would you expect the peak to move when the sample was heated from 0Â°C to 100Â°C?

$consider the powder x ray diffraction dan collected room temperature using an x ray wavelength ofa 154a llul 20 degrees polymorph polymorph polymcroh based on the tick marks for polymorphs b 61502$

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