Single-Crystal Growth and Room-Temperature Magnetocaloric Effect of X-Type Hexaferrite Sr2Co2Fe28O46
Journal Article
·
· Inorganic Chemistry
- Sun Yat-Sen Univ., Guangzhou (China). School of Chemistry and Chemical Engineering; Rutgers Univ., Piscataway, NJ (United States); South China Univ. of Technology (SCUT), Guangzhou (China)
- Guangxi Univ. of Science and Technology, Liuzhou (China)
- Rutgers Univ., Piscataway, NJ (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Chinese Academy of Sciences (CAS), Shanghai (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sun Yat-Sen Univ., Guangzhou (China). School of Chemistry and Chemical Engineering; Rutgers Univ., Piscataway, NJ (United States)
- South China Univ. of Technology (SCUT), Guangzhou (China)
X-type hexaferrites have been receiving considerable attention due to their promising applications in many magnetic-electronic fields. However, the growth of single-crystal X-type hexaferrite is still a challenge. Herein we reported, for the first time, the preparation of single crystal X-type hexaferrite Sr2Co2Fe28O46 (Sr2Co2X) with high-quality and large size using floating-zone method with laser as the heating source. The crystals show rhombohedral symmetry with space group of R-3m (No. 166, a = 5.8935(1) Å and c = 83.7438(17) Å). Co2+ and Fe3+ oxidation states were confirmed by the X-ray absorption near-edge spectroscopy. The prepared Sr2Co2X exhibits a spin reorientation transition from easy-cone to easy-axis at T2 of 343 K and a ferrimagnetism–paramagnetism transition at Curie temperature (TC) of ~743 K. The spin reorientation transition was accompanied by magnetocaloric effect (MCE). Both conventional and inverse MCEs were observed near T2 with a magnetic field applied along the c-axis. The maximum value of the magnetic entropy change along the c-axis was evaluated to be 1.1 J/kg·K for a magnetic field change of 5 T.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0012704; AC02-06CH11357
- OSTI ID:
- 1631933
- Alternate ID(s):
- OSTI ID: 1660272
- Report Number(s):
- BNL--215979-2020-JAAM
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 10 Vol. 59; ISSN 0020-1669
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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