The Studies Of The Magnetostriction In Double Perovskite Oxide

Magnetostrictive effect is the variety of length and volume resulted from thedeflexion and orientation along the given direction of inner magnetic domain. It canproduce response and drive to the outside. As a kind of strategic smart material in the21st century, it is widely used in military and national defense, aerospace,biomedicine, transportation, instrumentation and other fields, it also plays animportant role in the national economy.By solid-state reaction method we successfully synthesized a series of Re-baseddouble perovskite oxide A₂B'B"O₆. We found that the best condition of synthetisingthe double perovskite-type oxide Sr₂FeReO₆ were sintering temperature of 1210℃,and argon atmosphere. In addition, many times of grind and pre-sintering were alsoimportant. We successfully obtained the densificational and highly ordered tetragonalpure-phase Sr₂FeReO₆. Then we measured magnetostrictions of the double perovskiteSr₂FeReO₆ at different temperatures. The sample showed a magnetostriction up to530ppm at the temperature of 280K when the magnetic field was up to 1T. However,the magnetostriction had not reached saturation at 1T, we thought it should show amore significant magnetostrictive effect at higher magnetic field.In addition, we also studied the synthesis and magnetostriction of theantiferromagnetic FeMn alloy. And we obtained the single fcc phase of FeMn. At thesame time we also studied the composite material which composed by shape memoryalloys and magnetostrictive materials. The different selection and proportions of theshape memory alloy and magnetostrictive materials,as well as the choice of thebinder were studied furtherly.