The mean-field Weiss theory is often used to compute this value.
In barium titanate, this value is the range in which the positive temperature coefficient effect can occur. This value is a linear function of defect concentration according to the Montroll-Berlin-Kac spherical model. This value appears in the denominator of a law which sets a constant divided by the quantity T minus this value equals chi, which explains why the susceptibility becomes infinite at this value. The mean-field Weiss theory is often used to compute this value. Past this point, rotation symmetry is broken in a second-order phase transition and magnetization goes to zero at this point. For 10 points, identify this temperature below which a paramagnetic material becomes ferromagnetic, named for a French physicist.
In barium titanate, this value is the range in which the positive temperature coefficient effect can occur.
Curie temperature