Thermal Analysis of Iron Sulfides at the Temperature Range of β-transformation

Abstract

The measurements of specific heat was performed at the temperature range of β-transformation in iron sulfides with various sulfur contents x ranging from x =1 to x =1.12. A peak in specific heat versus temperature curve is found at 315°C, and this temperature as well as the jump in specific heat, 0.05 cal gr. -1 deg. -1 in value, is almost independent of sulfur contents. The mechanism of transformation is discussed, based upon the theory of ferrimagnetism, and it is concluded that the present experimental results accord well with the theoretical ones.