Answer the following for a primitive cubic unit cell.
For the type of packing answer, use letters (starting with A, then B, then C) without spaces and separated by hypens (-) to indicate the layers of solid present.
type of packing =?
type of holes =?
# atoms / 1 unit cell = 1
coordination # =6
I got the last two, but can't figure out the first 2
Any help would be appreciated
type of packing = A-B-C-A-B-C-A-B-C as every third level is the same in Face Centred Cubic.
type of holes =ocathedral and tetrahedral
# atoms / 1 unit cell = (4 for FCC)
coordination # = (12 for FCC)
Sure! I'd be happy to help you with that.
To determine the type of packing for a primitive cubic unit cell, we need to understand how the atoms are arranged in the crystal structure. In a primitive cubic unit cell, the atoms are located only at the corners of the cube. Each corner is shared by eight adjacent unit cells, forming a simple cubic lattice.
Now, let's consider the layers of solid present in the structure. In a primitive cubic unit cell, there is only one layer of solid. This is because the unit cell contains atoms only at the corners, and there are no additional atoms within the unit cell.
Therefore, the type of packing for a primitive cubic unit cell can be represented as A.
Moving on to the type of holes, we need to consider the empty spaces or voids within the lattice structure. In a primitive cubic unit cell, there are no holes present because all the available space within the unit cell is occupied by atoms. Consequently, the type of holes for a primitive cubic unit cell would be None or N/A.
To summarize:
- Type of packing for a primitive cubic unit cell: A
- Type of holes for a primitive cubic unit cell: None (N/A)
I hope this clears things up for you! Let me know if you have any further questions.