An element, BCC , shows diffraction peaks at 2theta: 40, 58, 73, 86.8, 100.4 and 114.7: Determine:(a) Crystal structure ? ?(b) Lattice constant
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- Discuss glass transition temperature and the factors affecting GTT and what are its significances. Give detailed answer pleaseList three main types of crystal structure systems in metals, and illustrate the main differences between Body Centred Cubic, Face Centred Cubic and Hexagonal Close Packed structures, in terms of the atomic plane arrangements, Coordinate Number (CN) and Atomic Packing Factor (APF) calculations, with giving metal examples for each type and explain the effect of this difference on the metal propertiesCan nitrogen fit into the octahedral interstitial site in BCC iron? Justify your answer by calculation. Atomic radius of nitrogen is 0.071nm and lattice parameter of BCC iron is 0.2866 nm
- Knowing that the crystal spacing of the monochromator [Topaz crystal (303) ] has an interplanar distance of 0.1356 nm, calculate the limits of the wavelengths within which it is possible to record the spectrum if the angle of incidence is (2q =10º and 2q =160º )A compound made up of elements ‘A’ and ‘B’ crystallises in a cubic closepacked structure. Atoms A are present on the corners as well as facecentres, whereas atoms B are present on the edge-centres as well asbody centre. What is the formula of the compound?Data on a single crystal of NiSO4⋅7H2O give χm = 6.00 × 10−8 m3 mol−1 at 298 K. Identify the effective number of unpaired electrons in this compound and compare your result with the theoretical value.
- Lattice parameters of α and β phases were calculated from x-ray diffraction measurements performed in A-B alloys with different compositions, all quenched from 500, 600 and 700 °C. Draw a schematic A-B phase diagram using this informationWith specific reference to Pauling’s rules of crystal chemistry, explain, with the aid of labeled sketches why the polymerization of silicate tetrahedra or borate triangles can (and often does) occur in crystal structures, whereas the extended polymerization of carbonate triangles or sulfate tetrahedra is rare in mineral structures.Properties of Liquids and IMF. Give a brief explanation
- A coherently strained quantum well laser has to be made from InxGa1-xAs on a GaAs substrate. If the minimum thickness of the region is 50 Ǻ, calculate the maximum composition of In that can be tolerated. Assume that the lattice constant of the alloy can be linearly interpolated from its components.Which elements can be used asinterstitial atoms in interstitial-type solid solutions? Describe reasons,mechanismof formation and possibilities.Calculate the planer density of planes (0:-1:-1) for BCC, and FCC crystal structures?