Rare-earth magnetic material and preparation method thereof

A magnetic material and rare earth technology, applied in the field of rare earth magnetic material and its preparation, can solve the problems that have not been seen before, and achieve the effects of easy control of chemical composition, simple preparation method and low cost

Inactive Publication Date: 2015-02-04
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the in-depth study of the relaxation mechanism of single-molecule magnets and the rapid progress of characterization technology, more and more rare-earth single-molecule magnets with practical value have been synthesized, but no chemical formula [Dy 6 L 2 (μ 3 -OH 2 ) 2 (μ 3 -OCH 3 ) 2 (piv) 10 (OCH 3 ) 2 ] Related reports on rare earth magnetic materials

Method used

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  • Rare-earth magnetic material and preparation method thereof
  • Rare-earth magnetic material and preparation method thereof
  • Rare-earth magnetic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The rare earth magnetic material [Dy] that the present invention relates to 6 L 2 (μ 3 -OH 2 ) 2 (μ 3 -OCH 3 ) 2 (piv) 10 (OCH 3 ) 2 ], wherein L is 3-{[(2-hydroxy-3-methoxyphenyl)methylene]amino}-1,2-propanediol, and piv is trimethylacetic acid.

[0033] [Dy 6 L 2 (μ 3 -OH 2 ) 2 (μ 3 -OCH 3 ) 2 (piv) 10 (OCH 3 ) 2 ] The synthetic method is:

[0034] Weigh the analytically pure DyCl according to the molar ratio of 3:2:1 3 ·6H 2 O, trimethylacetic acid and 3-{[(2-hydroxy-3-methoxyphenyl)methylene]amino}-1,2-propanediol (where DyCl 3 ·6H 2 O is 0.05mmol, i.e. 0.01885g), placed in a beaker, then added a mixed solvent composed of 2mL methanol and 2mL acetonitrile, stirred evenly, then adjusted the pH=6.1 of the solution with analytically pure triethylamine; the resulting mixed solution was transferred to In a Pyrex thick-walled glass tube with a length of about 18 cm, freeze and evacuate the tube with liquid nitrogen, and then place the fused-sealed...

Embodiment 2

[0046] Repeat Example 1, the difference is:

[0047] 1) DyCl 3 ·6H 2 The amount of O is changed to 0.1mmol, which is 0.0377g;

[0048] 2) Change the mixed solvent to consist of 4mL methanol and 4mL acetonitrile;

[0049] 3) adjust the pH value of the solution to 6.6;

[0050] 4) The reaction temperature is controlled at 90°C, and the reaction time is controlled at 24h.

[0051] Structural characterization and infrared characterization were performed on the obtained product, and the target product was determined to be a rare earth magnetic material [Dy 6 L 2 (μ 3 -OH 2 ) 2 (μ 3 -OCH 3 ) 2 (piv) 10 (OCH 3 ) 2 , the characterization of the magnetic properties of the product shows that the rare earth magnetic material obtained at room temperature χ M T is 64.5cm 3 Kmol -1 , as the temperature decreases, χ M T increases gradually and reaches a maximum value of 66.4cm at 60K 3 Kmol -1 , then dropped sharply to 36.8cm 3 Kmol -1 . and χ M –1 The -T curve obeys...

Embodiment 3

[0053] Example 1 was repeated except that the pH of the solution was adjusted to 5.8.

[0054] Structural characterization and infrared characterization were performed on the obtained product, and the target product was determined to be a rare earth magnetic material [Dy 6 L 2 (μ 3 -OH 2 ) 2 (μ 3 -OCH 3 ) 2 (piv) 10 (OCH 3 ) 2 , the characterization of the magnetic properties of the product shows that the rare earth magnetic material obtained at room temperature χ MT is 64.5cm 3 Kmol -1 , as the temperature decreases, χ M T increases gradually and reaches a maximum value of 66.4cm at 60K 3 Kmol -1 , then dropped sharply to 36.8cm 3 Kmol -1 . and χ M –1 The -T curve obeys the Curie-Weiss law, and the Weiss constant is 78.5K and the Curie constant is 2.13cm. 3 Kmol –1 . Positive Weiss constant and χ M The trends of T-T curves all suggest that there is ferromagnetic exchange between dysprosium ions in the molecule, and the overall performance is paramagneti...

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Abstract

The invention discloses a rare-earth magnetic material and a preparation method thereof. The chemical formula of the rare-earth magnetic material is [Dy6L2(Mu3-OH2)2(Mu3-OCH3)2(piv)10(OCH3)2], L is 3-{[(2-hydroxy-3-methoxyphenyl)methylene]amino}-1,2-propylene glycol, and piv is trimethylacetic acid. The preparation method of the rare-earth magnetic material is as follows: with DyCl3 6H2O, the trimethylacetic acid and the 3-{[(2-hydroxy-3-methoxyphenyl)methylene]amino}-1,2-propylene glycol as materials and methanol and acetonitrile as solvents, the target product is prepared by solvothermal reaction after pH is regulated to be equal to 5.5 to 6.6. The magnetic properties of the rare-earth magnetic material described by the invention are as follows: ferromagnetic exchange exists between dysprosium ions in molecules, and the rare-earth magnetic material acts as paramagnetism on the whole; the method described by the invention is simple, the cost is low, the chemical constituents are easy to control, and repeatability is good.

Description

technical field [0001] The invention relates to a rare earth magnetic material and a preparation method thereof, belonging to the technical field of magnetic materials. Background technique [0002] Rare earth, as a strategic resource, has long been used in defense fields such as aviation, aerospace, military industry and information. Among them, the huge application potential of rare earth-based single-molecule magnets in data storage, information processing, quantum computing, spintronics, magnetic refrigeration, etc. has attracted widespread attention from scientists all over the world, and has become a research hotspot in many frontier disciplines. Research in this field has important practical significance for developing green economy and promoting the harmonious development of human and nature. Rare-earth-based single-molecule magnets are a class of magnetic materials. To study the mechanism of magnetism and establish a suitable theoretical model is the only way to mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/42
Inventor 邹华红梁福沛
Owner GUANGXI NORMAL UNIV
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