Preparation of Rare Earth - Transition Metal Intermetallic Compound Nanocapsules and Study on Magnetic Refrigeration Mechanism at Room Temperature View Homepage


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2012-2016

FUNDING AMOUNT

800000 CNY

ABSTRACT

The RxMy nanocapsules with graphite layers as shells and magnetic intermetallic compounds as cores will be prepared by the plasma arc-discharge technique. The compound cores are composed of lanthanide and transition metal elements and the magnetic cores have the characteristic that their Curie temperatures are higher than room temperature. We will systematically research the growth regularity of the nanocapsules with controlled phase composition and size distribution. The correlation between the magnetic properties and phase composition, doped elements of the nanocapsules will be studied in detailed. The principle that the Curie temperature and blocking temperature of the nanocapsules shift to room temperature through tuning the structure and size of the nanocapsules will be studied. In further, the nanocapsule system with wide refrigeration temperature range and highest magnetic entropy change at room temperature would be exploited, because we can utilized the characteristic that their magnetic phase transformation and superparamagnetic properties appear at room temperature at the same time. We also try to construct the semi-theoretical model to describe the correlation between the magnetic entropy change of the nanocapsules and their magnetic properties, structure, magnetic field and temperature. The active ag More... »

URL

http://npd.nsfc.gov.cn/projectDetail.action?pid=51271178

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