A large magnetocaloric effect of GdCoO_3−δ epitaxial thin films prepared by a polymer assisted spin-coating method

Abstract

We have investigated the magnetic properties and the magnetocaloric effect of GdCoO3−δ epitaxial thin films which were successfully grown on a (001) LaAlO3 substrate by a simple polymer assisted deposition (PAD) method.

Synergistic Experimental and Theoretical Studies of Luminescent–Magnetic Ln2Zn6 Clusters

“…Single-molecule magnet (SMM) and magnetocaloric effect (MCE), inter alia , are the two most important lanthanide-magnetism topics that have tantalized the attention of both chemists and physicists in recent years. − The Dy 3+ compounds, because of their significant anisotropy arising from large unquenched orbital angular momentum and a high energy reversal barrier, more-often-than-not show slow magnetic relaxation and dominate SMM studies. − On the other hand, the Gd 3+ ion, by virtue of its large spin-only magnetic moment, weak superexchange interaction, and quenched orbital momentum, predominates the recent quest for low-cost, environmentally benign cryogenic technology using MCE-based magnetic refrigeration. − Notwithstanding their individual magnetic features, the combination of Dy 3+ and Gd 3+ with transition metals is often found to excel the magnetic behavior. − …”

Magnetocaloric Effect and Thermal Conductivity of a 3D Coordination Polymer of [Gd(HCOO)(C2O4)]n

“…Because of its ecofriendliness, refrigeration efficiency, and low energy consumption, magnetic refrigeration is regarded as a promising cooling technology. − In research of magnetic refrigeration, one of the challenges is how to obtain magnetic coolants with large MCE. To this end, different kinds of magnetic materials such as metallic oxides, − metal clusters, − and coordination polymers − have been prepared or employed as magnetic coolants, and some of them exhibit a large MCE as observed in GdF 3 , , Gd­(OH)­CO 3 , Gd­(OH) 3 , and GdPO 4 at 7 T. It is worth noting that large MCE of magnetic materials at low magnetic fields makes more sense for practical applications given the availability of commercial NdFeB permanent magnets at low magnetic fields (2 T). However, among a large number of reported magnetic coolants, very few magnets have magnetic entropy changes (−Δ S m ) > 30 J kg –1 K –1 at Δ H = 2 T and T < 2 K .…”

High-Entropy Perovskite Oxide: A New Opportunity for Developing Highly Active and Durable Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

“…The designed high-entropy PLNBSCC air electrode has been demonstrated to exhibit excellent ORR and OER activity. Here, a thinner electrolyte layer was prepared by spin coating, which further improved the electrochemical performance, optimized the cell structure, and reduced R o [ 70 , 71 ]. Figure 5 a depicts the I – V and power density curves of the single cell using PLNBSCC air electrode and spin-coated electrolyte layer, the peak power densities of the single cell in fuel cell mode were 1.21, 0.96 and 0.66 W cm −2 at 600, 550 and 500 °C, respectively.…”