Fluorinated gadolinium carbonate as well as preparation method and application thereof

Abstract

The invention discloses fluorinated gadolinium carbonate as well as a preparation method and application thereof and belongs to rare earth gadolinium materials. The fluorinated gadolinium carbonate is a novel fluorine and carbonate coordinated rare earth gadolinium material, and the structural composition formula of the fluorinated gadolinium carbonate is [GdCO3F] n (1), the maximum magnetic entropy change value of the material is 69.9 J kg <-1 > K <-1 > at 2K and 7T. The preparation method comprises the following steps of: adding hydrated gadolinium carbonate as a raw material into water; adding sodium tetrafluoroborate; fully stirring an obtained mixed solution, and transferring the solution into a hydrothermal kettle for hydrothermal reaction; and performing washing and drying to obtain a target product. A synthesis device of the fluorinated gadolinium carbonate is simple, preparation is convenient and fast, operation is easy, and the fluorinated gadolinium carbonate can be applied to preparation of magnetic refrigeration materials. Rare earth Gd < 3 + > with a high spinning ground state and small magnetic anisotropy is selected as cations, CO3 < 2-> with small molecular weight is selected as a ligand, the mass ratio of the rare earth to the ligand is increased to improve the magnetic density, and meanwhile, a fluorine ligand is doped into the material, so that the magnetic refrigeration effect of the material is greatly improved.

Description

technical field [0001] The invention relates to a novel rare earth gadolinium material coordinated by fluorine and carbonate, in particular to a gadolinium fluorocarbonate and its preparation and application. Background technique [0002] Traditional gas compression refrigeration technology has been widely used in people's daily life, but with the continuous improvement of people's living standards, the low efficiency of traditional gas compression refrigerators can no longer meet people's requirements. At the same time, the refrigerant Freon used in traditional refrigerators will seriously damage the ozone layer. People began to explore a new type of refrigeration technology, which has the two advantages of high efficiency, energy saving and no environmental pollution. In 1997, the Ames Laboratory of the US Department of Energy discovered that an alloy composed of Gd, Si, and Ge can exhibit a huge magnetocaloric effect at room temperature. Since then, American Aerospace Cor...

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Problems solved by technology

[0002] Traditional gas compression refrigeration technology has been widely used in people's daily life, but with the continuous improvement of people's living standards, the low efficiency of traditional gas compression refrigerators can no longer meet people's requirements

At the same time, the refrigerant Freon used in traditional refrigerators will seriously damage the ozone layer. People began to explore a new type of refrigeration technology, which has the two advantages of high efficiency, energy saving and no environmental pollution.

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