Large reversible room-temperature magnetocaloric effect in the Ba0.5Sr1.5Zn2Fe12O22-related hexaferrites
Source abstract
Abstract
Abstract The magnetic and magnetocaloric effect (MCE) of Mg or Cu-doped Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 hexaferrites synthesized by the sol-gel method are investigated. The Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 shows a sharp paramagnetic to ferrimagnetic phase transition and a large conventional MCE at around room temperature. By the partial substitution of Zn with Mg or Cu, the magnetic transition temperature as well as the maximum MCE temperature can be tuned in the range of 300 and 375 K while keeping the maximum MCE nearly unchanged, which are beneficial characteristics for their application as near room-temperature magnetic refrigerants. For Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 , it is found that the maximum values of magnetic entropy change –Δ S M and relative cooling power (RCP) are 1.27 J/kg K and 124 J/kg for Δ H =4.4 T, respectively. Given its advantages, such as large RCP, suitable working temperature, low-cost raw materials, easy to synthesize, and environment-friendly, the Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 related hexaferrites may be potential candidates for room-temperature magnetic refrigeration.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Multiferroics and related materials · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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