2
$\begingroup$

What is Curie-Weiss temperature? What is the difference between Curie-Weiss temperature and Curie temperature?

$\endgroup$
2
$\begingroup$

The Curie temperature or Curie point is the temperature at which a ferromagnetic or a ferri-magnetic material becomes paramagnetic when heated. The effect is reversible.

On the other hand,the Curie-Weiss temperature is the temperature at which a plot of the reciprocal molar magnetic susceptibility against the absolute temperature T intersects the T-axis. The Curie-Weiss temperature can adopt positive as well as negative values.

I hope,now you will get the difference.

$\endgroup$
3
$\begingroup$

Naively, both temperatures are equal and they're the constant temperature $T_c$ entering the Curie-Weiss Law: $$ \chi = \frac{C}{T-T_c}. $$ However, the behavior is often more complicated and the formula above doesn't describe the susceptibility $\chi$ well for all temperatures. When it's so, the Curie temperature $T_c$ is the temperature at which the susceptibility actually blows up, so $\chi=C/(T-T_c)$ holds for $T\sim T_c$ while the Curie-Weiss temperature is the temperature for which the law $\chi=C/(T-T_0)$ holds for $T\gg T_0$, i.e. one reconstructed from the "shape of the hyperbola far away".

The temperatures are close $T_0\sim T_c$ for materials for which the transition is first-order; the temperatures are very different if the transition is second-order.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.