IGNOU PHE 13 2026 - The saturation magnetization of is . If the lattice co

Question

The saturation magnetization of $fcc\text{ Ni}$ is $5.1 \times 10^5\text{ A/m}$ . If the lattice constant for $\text{Ni}$ is $3.52\text{ \AA}$ , calculate the net magnetic moment per $\text{Ni}$ atom in the crystal in units of Bohr magnetons.

29 Jan 2026

Answer :

Word Count : 233

The saturation magnetization (M_s) is related to the magnetic moment per atom (\mu) by the relation: [ M_s = \frac{\text{total magnetic moment in a unit cell}}{\text{volume of unit cell}}. ] For an FCC lattice, there are 4 atoms per unit cell. The volume of the unit cell is: [ V = a^3 = (3.52 \times 10^{-10} \text{ m})^3. ] First, calculate (a^3) step by step: [ 3.52^3 = 3.52 \times 3.52 \times 3.52. ] [ 3.52 \times 3.52 = 12.3904 ] [ 12.3904 \times 3.52 \approx 43.61 ] So, [ V

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