Curie Temperature Measurements on Nanocrystalline Iron-based Mechanically Alloyed Materials

Introduction

During the past decades, weakly magnetic materials such as amorphous Fe(Ni)- based alloys containing a-Fe nanocrystallites with the body-centered cubic (bcc) structure have been the subject of increasing interest. Their magnetic properties make them suitable for use in magnetic parts and devices such as low and high-frequency transformers, alternating current machines, generators, induction coils, sensors and motors.

Summary

A TGA/SDTA851^e thermobalance was modified with the aid of a small magnet (10 milliTesla) in order to determine the Curie temperature (T_c) of iron-based mechanically alloyed nanocrystalline alloys. The determination of the correct value of the Curie temperature is important because it provides information about the change from ferromagnetic to paramagnetic behavior. The thermobalance was calibrated and adjusted beforehand using ferromagnetic elements (Fe, Co, Ni) as standards. Alloy formation can be followed as a function of time using TGA. 

_{Curie Temperature Measurements on Nanocrystalline Iron-Based Mechanically Alloyed Materials | Thermal Analysis Application No. UC 243 | Application published in METTLER TOLEDO Thermal Analysis UserCom 24}