Using Cu-Ka radiation (I = 154 pm), The Bragg angle is 22.2 for the (110) type planes for a BCC crystal of lattice parameter 288 pm and n = 1. Are these reflections allowed?
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- Determine the structure factor for the basis of the diamond. (a) S, =1+e 4+*+) basis (b) Spask =1+e? (c) Spasis =e (d) Spasis =1+ei+½+%)The stretching vibration of CO (g) is found at 2138 cm-1. The band is almost always displaced to lower wave number upon coordination of CO to a metal. Explain why this is the case.X-ray diffractionanalysis(using a Cu anode)of a specimen with a known cubiccrystal structure reveals that the peak generated as a result of reflection from the (110) plane occurs at a 2θ=32°. Determine the unit cell volume of this materia
- 6. Using structure factor rules, show that the selection rules for BCC crystal is h+k+l=even. Also show what are the reflection planes that are Bragg active?Potassium nitrate crystals have orthorhombic unit cells of dimensions a = 542 pm, b = 917 pm, and c = 645 pm. Calculate the values of θ for the (100), (010), and (111) reflections using radiation of wavelength 154 pm.I) Diamond crystallises in a face-centred cubic structure with a = 3.5625 Å. Calculate the d-spacing and peak position of the first allowed peak (i.e. the peak with the lowest hkl value that meets the selection rules) using a wavelength of 0.71073 Å. II) A solvothermal synthesis gave rise to a mixture of two crystalline phases: one phase consists of 50-65 μm octahedral crystallites while the other phase consists of 150-180 μm hexagonal plates. Identify a separation technique that would likely be effective in separating these materials.
- You are given the following data : Peak order (n) Diffraction Angle (2q) 1 38.6 2 55.7 3 70.0 Determine whether sample is fcc or bcc or neither. Give reason for your choice.1. For BCC (body-centered cubic) chromium (Cr, having atomic radium of 0.1249 nm), determine the expected diffraction angle (θ) for the second-order reflection from the (211) set of planes, under monochromatic radiation with a wavelength of 0.0711 nm.Thermogravimetric analysis of a zeolite of composition CaAl2 Si6 O16.nH2 O shows a mass loss of 20 per cent on heating to dryness. Determine n.
- 1) a) A solid substance is considered to be orthorhombic in nature. Since the edges of the unit cell are a = 3.50Å, b = 4.0 Å, c = 5.5 Å, calculate the d and 2θ positions for the 111 plane expected in the diffraction pattern as a result of CuKα radiation (λ = 1.54 Å). b) What is the Miller index of the plane intersecting the crystal axes (2a, 1b, -3c)?Calcium carbonate crystals in the form of aragonite have orthorhombic unit cells of dimensions a = 574.1 pm, b = 796.8 pm, and c = 495.9 pm. Calculate the values of θ for the (100), (010), and (111) reflections using radiation of wavelength 83.42 pm.5. For which set of crystallographic planes will a first-order diffraction peak occur at a diffraction angle of 46.21° for BCC iron when monochromatic radiation having a wavelength of 0.0711 nm is used?