Gadolinium fluorocarbonate and its preparation method and application

Abstract

Gadolinium fluorocarbonate and its preparation method and application relate to rare earth gadolinium materials. The gadolinium fluorocarbonate is a new rare earth gadolinium material coordinated by fluorine and carbonate, and its structural composition formula is [GdCO 3 F] n (1). At 2K, 7T, it exhibits the largest magnetic entropy change value of 69.9J kg ‑ 1 K ‑1 , and its preparation method is: adding gadolinium carbonate hydrate into water as a raw material, then adding sodium tetrafluoroborate, stirring well, transferring it to a hydrothermal kettle for hydrothermal reaction, washing and drying to obtain the target product. The synthesis device of gadolinium fluoride carbonate is simple, the preparation is convenient and fast, and the operation is easy, and it can be applied in the preparation of magnetic refrigeration materials. Selection of rare earth Gd with high spin ground state and small magnetic anisotropy 3+ As the cation, choose CO with small molecular weight 3 2‑ As a ligand, the mass ratio of rare earth / ligand is increased to increase the magnetic density, and the fluorine ligand is added to greatly improve the magnetic refrigeration effect of the material.

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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