| Abstrakt: |
Polarization P(T) of triglycine sulfate (TGS) crystal shows distinct properties versus temperature, between 28 °C and the Curie point Tc. Carefully measured polarization versus temperature on several ranges is presented. The slopes on the curve P(T) on three temperature ranges between 28 ÷ 46 °C appear quite normal, while near the Curie point (47 °C ÷ Tc) behave abnormally, due to the domain walls. The relaxation time LOW, MIDDLE and HIGH appear very interesting. The MIDDLE relaxation time τM, between 40 ÷ 46 °C behave like the HIGH relaxation time τH between 47 and 48 °C and between −20 ÷ 10 °C (25 KBT) similar to LOW relaxation time τL (28KBT). The diagrams Cole-Cole of TGS are analyzed here for the first time. Roughly, several parameters change their slopes at 30, 42, and 47 °C. The values of ε′H and εʺH show about the same slope on the zones 42–47 °C and 30–42 °C. For the same zones, ε′L shows several increasing activation energies toward Curie point, except εʺL and RL whose activation energy decreases. Finally, we mention the opposite variation of the negative ordinate YCH, YCL of both arcs Cole-Cole and of the radius RH and RL. [ABSTRACT FROM AUTHOR] |
