Задача id14328

In gadolinium, which belongs to the group of rare earth elements, magnetism is due to the spin magnetic moment of the 4f shell, located in the “depth” of the atom. Each Gd ion has n = 12 nearest neighbors, and the average spin value is S = 7/2. Estimate the value of the exchange integral in Gd, whose Curie temperature TC = 293 K.

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