Superconducting Metals and X-ray Crystallography

Express the coordination number of the simple cubic unit cell.

Discuss the End-centred unit cell.

Write the different types of centred unit cells.

Define primitive unit cell.

What Meissner effect?

By reflecting _____ of known wavelength off different layers of the crystal the distance between the layers and hence the unit cell edge length can be determined.

Explain the applications of X-ray Crystallography.

_____ have been used to detect small magnetic fields.

Give the applications of superconductors.

_____ theory explains that below the critical temperature electrons in superconductors form Cooper pairs which move freely through the superconductor.

Explain Bardeen-Cooper-Schrieffer (BCS) Theory.

A _____ superconductor displays a range of properties with a gradual transition.

Define the type 2 superconductor.

A _____ demonstrates a sharp transition from superconducting (showing the Meissner effect of expelling magnetic fields) to normal behaviour.

Define type 1 superconductor.

Niobium is found to crystallise with bcc structure and found to have density of $8.55 \mathrm{g} {\mathrm{cm}}^{-3}$.  Determine the atomic radius of niobium if its atomic mass is $93$ $(14.29 \mathrm{nm})$.

Which of the following lattice has the highest packing efficiency among simple cubic, body centred cubic and hexagonal close packing?

Name the parameters that characterise a unit cell. 

The co-ordination number of eight for cation is found in : 

Lithium forms a body-centred cubic structure. The length of the side of its unit cell is $351 \mathrm{pm}$. The atomic radius of lithium will be