# What is planar density?

## What is planar density?

Planar density is the fraction of total crystallographic plane area that is occupied by atoms. Linear and planar densities are one- and two-dimensional analogs of the atomic packing factor.

**What is the planar 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)?

**How do you do planar density?**

Calculate planar density with the formula: PD = Number of atoms centered on a given plane / Area of the plane.

### What is the difference between planar and linear?

It does not, of course, apply to planar structures, in which the apparent lineations should all be in the one plane, whereas those of a linear structure should conform to a double-cone-shaped body with the true lineation as its axis. Planar structures.

**What is a family of directions?**

The concept of a family of directions. A set of directions related by symmetry operations of the lattice or the crystal is called a family of directions. A family is a symmetry related set. A family of directions is represented (Miller Index notation) as: .

**What are the similarities and dissimilarity between fcc and hcp structure?**

Dear Sohail, FCC or the Face centres cubic and Hexagonal close packed structures both have a packing factor of 0.74, consists of closely packed planes of atoms and have a coordination number of 12. That is where the similarities end.

#### What is the most dense plane in FCC?

Structure | Close packed planes | Close packed directions |
---|---|---|

Face-centered cubic (FCC) | {111} | <110> |

Hexagonal close-packed (HCP) | Basal planes: (0001), (0002); Prismatic planes: one of the three {10-10} planes; Pyramidal planes: one of the six {10-11} | <100>, <110> (three-axis notation) or <11-20> (four-axis notation) |

**What are linear features?**

A Linear Feature can denote a single or multiple Themes along a line. By changing the ‘From’ and ‘To’ Data Fields along the length of the Linear Feature, different Themes can be allocated to a single line along different parts of the length.

**What is a linear structure?**

A linear or chronological structure is where the story is told in the order it happens. With a chronological or linear structure, the reader finds out what happens in the ‘correct’ order – this can lead the reader through events clearly.

## What is the surface density of a planar plane?

The length of one of the sides of the plane is a*sqrt(2). Hence the surface density is 1/(a*sqrt(2)) atoms per unit area. The [111] plane is a plane that touches the three far corners of the unit cell and it looks like a triangle.

**Which is the formula for the density of an object?**

This is done by dividing the object’s mass by its volume. The formula for density is: Density = Mass / Volume. This equation can also be written: ρ=m/V. In the formula, ρ is the symbol for density. Scientists measure density in kilograms per cubic metre (kg/m3).

**Which is the best definition of the word planar?**

Definition of planar 1 : of, relating to, or lying in a plane 2 : two-dimensional in quality Other Words from planar Example Sentences Learn More about planar

### What do you need to know about density?

Lesson Summary. Density measures the mass of an object or substance compared to its volume. The equation we use to find density is: density = mass / volume. If an object is heavy and compact, it has a high density. If an object is light and takes up a lot of space, it has a low density.