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How do you find the FCC planar density?

Find the area of the plane. As an example, the area of a (1 1 0) plane of an FCC crystal is 8_sqrt(2)_R^2 where “R” is the radius of an atom within the plane. Calculate planar density with the formula: PD = Number of atoms centered on a given plane / Area of the plane.

What is the atomic density of 111 plane in FCC?

For (111): From the sketch, we can determine that the area of the (111) plane is (v2a./2) (va/V2) = 0.866a.. There are (3) (1/2) + (3) (1/6) = 2 atoms in this area. planar density = 2 points 0.866(3.5167 x 10-8 cm)?

What is the packing fraction of diamond?

0.74

What is the packing fraction of BCC unit cell?

They occupy the maximum possible space which is about 74% of the available volume. Hence they are called closest packing. In addition to the above two types of arrangements a third type of arrangement found in metals is body centred cubic (bcc) in which space occupied is about 68%.

What is the packing efficiency of BCC unit cell?

68%

What is packing efficiency of HCP?

The packing efficiency of both types of close packed structure is 74%, i.e. 74% of the space in hcp and ccp is filled. The hcp and ccp structure are equally efficient; in terms of packing. The packing efficiency of simple cubic lattice is 52.4%. And the packing efficiency of body centered cubic lattice (bcc) is 68%.

What is true about NaCl?

It is a salt because it decreases the concentration of metallic ions. It is an acid because it is formed by the reaction of a salt and an acid. It is a salt because it is formed by the reaction of an acid and a base. It is an acid because it increases the concentration of nonmetallic ions.

What is the coordination number of Cs+ and Cl ions in the CSCL structure?

The coordination number is 8 : 8 in Cs+ and Cl−.

What is the coordination number of CL in NaCl?

6

Why does CsCl have a different crystal packing arrangement than NaCl?

CsCl and NaCl do not adopt identical crystal packing arrangements because the Cs + ion is considerably larger than the Na + ion. In a cesium chloride crystal, the cesium ion (orange) occupies the center, while the chloride ions (green) occupy each corner of the cube. The coordination number for both ions is 8.

Why are the packing arrangements for Na+ and Cs+ different?

Why are the packing arrangements for Na+ and Cs+ different? The cesium ion is much larger than the sodium ion.