ParaMagnetism.pptx

Para

1. ParaMagnetism ​

2. What is Paramagntism ? Paramagnetism 2 Paramagnetism is a form of magnetism where some materials are weakly attracted by an externally applied magnetic field. Paramagnetic materials are attracted towards magnetic Fields in which they move from a region of a weaker magnetic field to a stronger magnetic field, this phenomenon is called paramagnetism . These paramagnetic materials consist of most of the elements and some compounds that have unpaired electrons in their valence shells. Eg : O2,CuO,Fe3+,Al,Mn,Cu2+ etc..

3. Properties of Paramagnetic Materials Paramagntism 3 The unpaired electrons in the atoms of paramagnetic materials are engaged in an incessant dipole moment due to the unpaired electron spin. Paramagnetic materials move from a weaker region to a stronger region in a nonuniform electric field. The degree of magnetization of paramagnetic materials in an external electric field (i.e. magnetic susceptibility) is positive and small. The magnetic permeability of a paramagnetic substance is greater than or equal to one. Paramagnetic materials are attracted towards the electric field weakly. Temperature is inversely proportional to magnetization in a paramagnetic material.

4. Curie's law According to Curie’s law, paramagnetic materials are magnetically susceptible (can be magnetized), and they show paramagnetism at a wide range of temperatures. Curie's law states that the magnetic susceptibility of paramagnetic materials is inversely proportional to the temperature. 4 Paramagnetism M = C(B/T) Where, M is the magnetization of the material. C is called the material-specific curie's constant. T is the temperature in Kelvin. B is the applied magnetic field.

5. 5 presentation title At a certain temperature, the magnetic substances undergo acute changes in their behaviour and properties, this temperature is called  Curie's temperature . Curie's temperature is also called Curie's point. Curie discovered the relationship of temperature with magnetic properties. Curie's point is different for different materials. A ferromagnetic material becomes paramagnetic above Curie's temperature, but paramagnetic materials suffer no change. Curie's temperature Paramagntism

6. 6 Paramagntism Sodium Calcium Aluminium Tungsten Caesium Lithium Magnesium Examples of Paramagnetic Materials

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