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Packing Efficiency: Body-Centred Cubic Structure Video Lecture - NEET
FAQs on Packing Efficiency: Body-Centred Cubic Structure Video Lecture - NEET
| 1. What is packing efficiency in the context of a body-centred cubic structure? |  |
Ans. Packing efficiency refers to the amount of space occupied by the atoms or particles in a body-centred cubic (BCC) structure. It is a measure of how efficiently the atoms are arranged within the structure, and it is calculated by dividing the total volume occupied by the atoms by the total volume of the unit cell.
| 2. How is the packing efficiency in a body-centred cubic structure calculated? | |
Ans. The packing efficiency in a body-centred cubic structure can be calculated by considering the arrangement of atoms within the unit cell. In a BCC structure, the atoms are arranged in a cubic lattice with one atom at each corner and one atom at the centre of the cube. The total volume occupied by the atoms is equal to the volume of the atoms multiplied by the total number of atoms in the unit cell. The packing efficiency is then calculated by dividing this total volume by the total volume of the unit cell.
| 3. What is the relationship between the packing efficiency and the coordination number in a body-centred cubic structure? | |
Ans. In a body-centred cubic structure, the coordination number is the number of atoms or particles that are in direct contact with a given atom. For BCC structures, the coordination number is 8. The packing efficiency is related to the coordination number because it represents the ratio of the total volume occupied by the atoms to the total volume of the unit cell. Therefore, a higher coordination number indicates a higher packing efficiency.
| 4. How does the packing efficiency in a body-centred cubic structure compare to other crystal structures? | |
Ans. The packing efficiency in a body-centred cubic structure is relatively low compared to other crystal structures. In a BCC structure, the packing efficiency is approximately 68%. This is because the arrangement of atoms in a BCC structure leaves more empty space between the atoms, resulting in a lower packing efficiency. In comparison, other crystal structures such as face-centred cubic (FCC) and hexagonal close-packed (HCP) structures have higher packing efficiencies.
| 5. How does the packing efficiency affect the physical properties of materials with a body-centred cubic structure? | |
Ans. The packing efficiency in a body-centred cubic structure can have an impact on the physical properties of materials. A lower packing efficiency in a BCC structure can result in lower density and higher porosity, as there is more empty space between the atoms. This can affect the material's strength, conductivity, and other properties. Additionally, the lower packing efficiency may also influence the material's ability to undergo phase transitions or accommodate defects within the crystal lattice.
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