Curie temperature - definition
Curie temperature - definition
Curie temperature is the characteristic temperature value above which ferromagnetic materials lose their magnetic properties and change to a paramagnetic state. This phenomenon is due to the breakdown of the ordered arrangement of the magnetic moments of the atoms, which at temperatures below Curie allows spontaneous magnetisation of the material. Beyond this limit, the thermal vibrational energy of the atoms becomes large enough to interfere with the spin interactions, leading to the decay of the ordered arrangement of magnetic domains.
The Curie temperature depends on the type of material and its crystal structure, and its value is constant for a given substance. For iron it is about 770°C, for nickel 358°C and for cobalt 1130°C. This phenomenon also applies to ferrite and piezoelectric materials, where the Curie temperature determines the limit of the phase transition, important for their functional properties such as magnetic susceptibility or the ability to generate an electrical charge under mechanical deformation.
In the case of dielectrics ferroelectrics, the Curie temperature determines the moment of transition from the ferroelectric to the paraelectric phase, which affects changes in relative electrical permeability and spontaneous polarisation. This phenomenon is widely used in technologies related to sensors, resonators, Ceramic capacitors and shape memory materials. The measurement and control of Curie temperature is important in the design of electronic and magnetic devices, especially where the stability of material properties is critical to system performance.
The concept of Curie temperature is named after Pierre Curie, who conducted pioneering research into the magnetic properties of solids and was the first to describe thermal magnetic transition phenomena.
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