Measurements have been made of thermal expansion in the direction of the b axis, in Cr-doped TGS crystals. Results show that the anomalous component of the thermal expansion coefficient varies linearly with (log(T-Tc))^1/3 in the interval 0.05ºC < T-Tc < 0.8ºC. The electric field produces a decrease of the slope of de Da vs.(log(T-Tc))^1/3 lines and a flattening of the transition peak.
	