Nb3Sn and GaV3 are candidates for a superconductive application when the magnetic field is 150,000 oersted. Which would require the lower temperature in order to be superconductive?
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Chemistry
The Science & Engineering of Materials Askeland 5th
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- Given caesium has a body-centred cube with density of 1.93 g/cm3. i. Determine the lattice constant of caesium if the molar mass of caesium is 132.9 g mol-1. (NA = 6.022 x 1023 atom mol-1) ii. Assuming the body-centred caesium is replaced by an anion, X, suggest the type of structure of this derivative. iii. Determine coordination environment for both ions.(i) Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-parallel directions in unequal numbers.(ii) Which stoichiometric defect decreases the density of the crystal?What colour are SnC12.2H2O crystals?
- Nb has Tc = 9.5 K and Hc(0) = 158 kA m−1. Calculate the highest magnetic field at which superconductivity can be maintained at 6 K.(i) Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other.(ii) Which stoichiometric defect does not change the density of the crystal?The unit cells of SbCl3 are orthorhombic with dimensions a = 812 pm, b = 947 pm, and c = 637 pm. Calculate the spacing, d, of the {321} planes.
- (d) Crystalline polyethylene has a density of 1000 kg m³ and amorphous polyethylene a density of 865 kg m3. Calculate the volume fraction crystallinity of a sample of branched polyethylene which has a density of 900 kg m. Why is the crystallinity of this sample so low?Electrochemistry Calculate the interplanar spacing (d) of the (223) planes of an orthorhombic cell with side lengths a = 0.82 nm, b = 0.94 nm and c = 0.75 nm.The magnitude of the magnetic moment of Mn2+ in its complexes is typically 5.3μB. How many unpaired electrons does the ion possess?
- 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?Which type of magnetic material cannot be used to makepermanent magnets, a ferromagnetic substance, an antiferromagneticsubstance, or a ferrimagnetic substance?In this experiment, it was necessary to assume that [FesCN^ 2+ ] std was equal to [SCNJinitial. Explain how the use of a relatively huge amount of Fe^ 3+ allowed us to make this assumption. Include the application of Le Chatelier's principle in your answer.