Question
Asked May 1, 2019
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2.Why does   K4[NiBr6]  behave as a simple Curie paramagnet , but

K[NiBr4] exhibit complex paramagnetic behavior with a temperature dependent effective magnetic moment .   

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Expert Answer

Step 1

The spontaneous magnetization disappears at the Curie temperature, Tc.  Magnetization can still occur by aligning dipoles in the paramagnetic state in the direction of a field.  

The Curie temperature is the critical point where a material's intrinsic magnetic moments change direction.  Magnetic moments are permanent dipole moments within the atom which originate from electrons' angular momentum and spin.  Materials have different structures of intrinsic magnetic moments that depend on temperature. At a material's Curie temperature those intrinsic magnetic moments change direction.

Step 2

Permanent magnetism is caused by the alignment of magnetic moments and induced magnetism is created when disordered magnetic moments are forced to align in an applied magnetic field. For example, the ordered magnetic moments (ferromagnetic) change and become disordered (paramagnetic) at the Curie temperature.

Higher temperatures make magnets weaker as spontaneous magnetism only occurs below the Curie temperature.  Magnetic suscepti...

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