Gadolinium compound with dual functions of magnetic refrigeration function and ferroelectric function and preparation method thereof

A compound and dual-function technology, which is applied in the field of magnetic refrigeration and ferroelectric dual-function gadolinium compounds and their preparation, can solve the problems of unsatisfactory performance of ferroelectric materials, and achieve great application value and good ferroelectric properties. effect of nature

Inactive Publication Date: 2013-04-03
NANKAI UNIV
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  • Application Information

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Problems solved by technology

High-performance ferroelectric materials are a class of functional materials with broad application prospects. Judging from the current research status, the research, development and application of high-performance ferroelectric materials are still in the development stage. Researchers choose different ferroelectric materials. Research on ferroelectric materials and continue to explore the preparation process, but so far the research on some properties of ferroelectric materials has not reached a satisfactory level.

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  • Gadolinium compound with dual functions of magnetic refrigeration function and ferroelectric function and preparation method thereof
  • Gadolinium compound with dual functions of magnetic refrigeration function and ferroelectric function and preparation method thereof
  • Gadolinium compound with dual functions of magnetic refrigeration function and ferroelectric function and preparation method thereof

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Embodiment

[0018] A preparation method of a gadolinium compound with magnetic refrigeration and ferroelectric bifunctionality, the steps are as follows:

[0019] 225.5mg of Gd(NO 3 ) 3 ·6H 2 O, 273mg of L was mixed in a container, then added 20mL of ethanol, adjusted the pH value to 7 with LiOH, stirred at room temperature for 2h; then baked in an oven at 100°C for 72h, took out the product, and separated the solid ; Then washed with ethanol for 3 times to obtain colorless strip crystals as the target object. The calculated yield based on metal Gd was 46%.

[0020] Characterization of the properties of the gadolinium material:

[0021] 1) Determination of the structure of the compound:

[0022] The crystal structure was determined using a Supernova type X-ray single crystal diffractometer, using Mo-Kα rays monochromated by graphite is the incident radiation source, with Diffraction points were collected by scanning, and unit cell parameters were corrected by least square method....

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Abstract

The invention discloses a gadolinium compound with dual functions of a magnetic refrigeration function and a ferroelectric function. The chemical formula of the gadolinium compound is shown as follows: [Gd3(HL)(H2L)(NO3)4].C2H5OH, wherein H4L is N, N, N', N'-tetrahydroxyethyl-ethylene diamine; the EtOH is ethanol; and the gadolinium compound has three Gd atoms with different coordination environments, so that an isosceles triangle structure is formed. The preparation method for the gadolinium compound comprises the following steps of: using hexahydrate gadolinium nitrate as metal salt; using H4L as ligand; using LiOH alkali substance to regulate the pH of the mixed solution to 7; and stirring and baking the mixed solution, and separating out the solid and washing the separated solid to obtain the gadolinium compound. The invention has the advantages that the gadolinium compound has excellent magnetic refrigeration and excellent ferroelectric properties, and so that the gadolinium compound has a giant potential value in low-temperature magnetic refrigeration and solid apparatuses such as a ferroelectric memory and the like.

Description

【Technical field】 [0001] The invention relates to a material with dual functions of magnetic refrigeration and ferroelectricity, in particular to a gadolinium compound with dual functions of magnetic refrigeration and ferroelectricity and a preparation method thereof. 【Background technique】 [0002] Langevin (P. Langevin) mentioned in 1907 that if the paramagnetic substance is in the process of adiabatic demagnetization, the temperature will also decrease. From the analysis of the magnetic mechanism, when magnetized by the magnetic field, the magnetic order of the solid magnetic substance containing paramagnetic ions is strengthened, and at this time the magnetic entropy decreases, and heat is released to the outside; otherwise, it is demagnetized, and the magnetism has As the order decreases, the magnetic entropy will increase at this time, and heat will be absorbed from the outside. The thermal phenomenon exhibited by this magnetic ionic substance in the process of applyi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/00C09K5/14
Inventor 程鹏王玉霞师唯
Owner NANKAI UNIV
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