Table of Contents
What is the Ca ratio?
The capital adequacy ratio is calculated by dividing a bank’s capital by its risk-weighted assets. The capital used to calculate the capital adequacy ratio is divided into two tiers.
How do you find C for HCP?
For a closest-packed structure, the atoms at the corners of base of the unit cell are in contact, thus a=b=2r. The height (c) of the unit cell, which is more challenging to calculate, is c=2a√23r=4√23r.
How do you calculate hexagonal close packing?
The central atom in layer B is surrounded by 6 atoms from layer B itself, while it is also surrounded by 3 atoms each from top and bottom layers. Hence the total number of surrounding atoms is 6+3+3 = 12, which gives us a coordination number of 12 for hcp structure.
What is C a ratio in hexagonal crystals?
1.633
For the HCP crystal structure, show that the ideal c/a ratio is 1.633.
What is the atomic packing factor of a hexagonal close-packed structure HCP?
0.74
The packing factors of slip systems include: Hexagonal close-packed (hcp): 0.74. Face-centered cubic (fcc): 0.74. Body-centered cubic (bcc): 0.68.
What is the ideal C A ratio for HCP metals?
How are particles arranged in hexagonal close packed structure?
Characteristics of Hexagonal Close Packing: The spheres of the third layer lie exactly above the spheres of the first layer. The arrangements of the first layer and third layer are identical. The arrangement of hexagonal close packing is represented as ABAB type. Packing efficiency is 74\%
What is the atomic packing factor of a hexagonal close packed structure HCP?
How many spheres are in hexagonal close packing?
These can be seen in the cuboctahedron with 12 vertices representing the positions of 12 neighboring spheres around one central sphere. The HCP arrangement can be seen in the triangular orientation, but alternates two positions of spheres, in a triangular orthobicupola arrangement.
What is the C/a ratio for the hexagonal close packed hcp?
In this video, Parisa works through the calculation of the c:a ratio for the hexagonal close packed HCP) crystal structure. The final answer is c/a = (2sqrt2)/sqrt3 = 1.63.
What is the packing capacity of hexagonal close packed crystals?
As you can see, hexagonal close-packed crystals have 74\% packing. That is exactly the same value as face-centered cubic (FCC) crystals, because both HCP and FCC are close-packed structures with the maximum possible APF (although it is possible to have higher packing if you use multiple kinds of atoms with different sizes).
What is a hexagonal close packed lattice?
The hexagonal close-packed lattice is a hexagonal prism with an atom on each vertex and three in center. Using the hard sphere model, which imagines each atom as a discrete sphere, the HCP crystal has each atom touch along the top and bottom of the prism.
What is the packing density of a closed packed structure?
Volume of all the six atoms in the unit cell The volume of the unit cell of the HCP = base area x height Thus the packing density is 74\% and hence, it is a closed packed structure.