Pyromagnetic
Definition and meaning of Pyromagnetic in chemistry.
Pyromagnetic refers to the property of a material whose magnetic properties change significantly in response to a change in temperature. It usually describes substances that can undergo a magnetic phase transition or generate measurable effects when heated or cooled.
In more detail
The pyromagnetic effect is related to the thermodynamic relationship between a material's magnetization, absolute temperature, and applied magnetic field. As thermal energy increases, it disrupts the alignment of magnetic moments, which drastically changes the net magnetization. This principle has been explored for thermal energy harvesting, where waste heat is converted into electrical energy by cycling a pyromagnetic material through a temperature gradient near its Curie temperature. Such materials are crucial in advanced sensor and energy conversion technologies.
Key facts
| Field | Physical Chemistry |
|---|---|
| Key Variable | Temperature |
| Application | Thermal energy harvesting |
Gadolinium exhibits strong pyromagnetic behavior near room temperature as it transitions rapidly from a ferromagnetic state to a paramagnetic state.
Frequently asked questions
Is pyromagnetic the same as pyroelectric?
No, pyroelectric refers to generating an electric charge from heat, whereas pyromagnetic refers to changes in magnetic properties from heat.
What happens at the Curie temperature?
The material loses its permanent magnetic properties and becomes paramagnetic due to thermal agitation.