Research Progress of Doped Manganite Materials in Magnetic Refrigeration

Abstract

Magnetic refrigeration technology is a new, green, high-efficiency approach. It has attracted increasing attention from researchers and has a strong competitiveness over traditional refrigeration methods. With the continuous development of social lives, magnetic refrigeration technology must have important application prospects. This article briefly describes the basic principles. The focus is on the introduction and summary of research on perovskite manganite doping in magnetic refrigeration. Finally, the outlook and summary of magnetic refrigeration technology are presented.

The magnetocaloric effect properties for potential applications of magnetic refrigerator technology: a review

“…Based on several studies, it can be concluded that A-site substitution with low-valence ions significantly influences changes in magnetic entropy and T C , often exhibiting extreme values that need to be considered for the effects of substitution in Mn 3+ /Mn 4+ in the material system. 18,77,117,119,121,143…”

“…Substitution at the B-site involves replacing Mn ions with specific ions to tailor T C and increase the magnetic moment, which can enhance the value of −Δ S M . 18,137,144 The elements substituted at the B-site are transition metals (Ni, V, Fe, Co, Cr, and Cu). Al-Shahumi et al reported an investigation on La 0.7 Sr 0.3 Mn 1− x Fe x O 3 ( x = 0.0–0.30) compounds, where the T C values decreased from 370 to 98 K, accompanied by a decrease in the −Δ S M values from 1.83 to 0.13 J kg −1 K −1 .…”

“…Vacancy substitutions are divided into two categories: vacancy substitution in oxygen or elements. 18 Vacancy substitution in PM materials oxygen sites tends to reduce the T C and −Δ S M values because the decreased DE interactions occur. The reduction in DE interactions can be associated with oxygen ions playing a crucial role as a bridge between two Mn 3+ and Mn 4+ ions.…”

“…16 On the other hand, the composition also influences the occurrence of Jahn–Teller distortion. 18 Schiffer et al studied the magnetic property behavior of La 1− x Ca x MnO 3 with increasing x , presenting three magnetic phase regions: paramagnetic, ferromagnetic, and antiferromagnetic. 154 Another example is the investigation by Szewczyk et al into La 1− x Sr x MnO 3 , where the addition of x exhibited regions of ferromagnetic, paramagnetic, and antiferromagnetic phases.…”

“…The MCE is an intrinsic property of magnetic materials that, when subjected to a magnetic field, induces changes in magnetic entropy (−Δ S M ) and adiabatic temperature changes (Δ T ad ), which can assist in controlling environmental temperature by increasing or decreasing it. 18,19…”