CN106710763A - Crystalline gadolinium-based magnetic refrigeration material and method for preparing same - Google Patents
Crystalline gadolinium-based magnetic refrigeration material and method for preparing same Download PDFInfo
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- CN106710763A CN106710763A CN201611169916.5A CN201611169916A CN106710763A CN 106710763 A CN106710763 A CN 106710763A CN 201611169916 A CN201611169916 A CN 201611169916A CN 106710763 A CN106710763 A CN 106710763A
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 title claims abstract description 57
- 229910052688 Gadolinium Inorganic materials 0.000 title claims abstract description 50
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000005057 refrigeration Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 15
- 239000007864 aqueous solution Substances 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 13
- GTZCVFVGUGFEME-HNQUOIGGSA-N trans-aconitic acid Chemical compound OC(=O)C\C(C(O)=O)=C/C(O)=O GTZCVFVGUGFEME-HNQUOIGGSA-N 0.000 claims abstract description 13
- GTZCVFVGUGFEME-UHFFFAOYSA-N trans-aconitic acid Natural products OC(=O)CC(C(O)=O)=CC(O)=O GTZCVFVGUGFEME-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims abstract description 7
- MWFSXYMZCVAQCC-UHFFFAOYSA-N gadolinium(iii) nitrate Chemical compound [Gd+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O MWFSXYMZCVAQCC-UHFFFAOYSA-N 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims abstract description 3
- 238000002360 preparation method Methods 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 5
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- RJOJUSXNYCILHH-UHFFFAOYSA-N gadolinium(3+) Chemical compound [Gd+3] RJOJUSXNYCILHH-UHFFFAOYSA-N 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 abstract 11
- 239000000203 mixture Substances 0.000 abstract 6
- 239000003446 ligand Substances 0.000 abstract 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- -1 trans-aconitate anions Chemical class 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- JBJWASZNUJCEKT-UHFFFAOYSA-M sodium;hydroxide;hydrate Chemical compound O.[OH-].[Na+] JBJWASZNUJCEKT-UHFFFAOYSA-M 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005283 ground state Effects 0.000 description 3
- 238000000634 powder X-ray diffraction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004467 single crystal X-ray diffraction Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/012—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials adapted for magnetic entropy change by magnetocaloric effect, e.g. used as magnetic refrigerating material
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/003—Compounds containing elements of Groups 3 or 13 of the Periodic Table without C-Metal linkages
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a crystalline gadolinium-based magnetic refrigeration material and a method for preparing the same. A molecular formula of the crystalline gadolinium-based magnetic refrigeration material is [Gd(L)(DMF)(H<2>O)<2>]<n> (wherein L<3-> represents trans-aconitate anions, and the DMF represents N, N-dimethylformamide). Single-crystal structures are provided with two-dimensional layer structures, and an asymmetric construction unit contains a trivalent gadolinium ion, a trivalent trans-aconitate ligand, a DMF molecule and two terminal ligand water molecules. The method includes adding aqueous solution of gadolinium nitrate and aqueous solution of trans-aconitic acid into a reaction flask; adding the DMF into the reaction flask; dropwise adding sodium hydroxide aqueous solution into systems under stirring conditions to regulate the pH (potential of hydrogen) of the systems until the pH of the systems reaches 2.2-3.0, stirring the sodium hydroxide aqueous solution and the systems for 5-10 min to obtain mixtures and then sealing the mixtures; heating the mixtures for 20-48 hours under the constant-temperature condition at the temperature of 85-100 DEG C; cooling the mixtures until the temperature of the mixtures reaches the room temperature; filtering and drying the mixtures to obtain the gadolinium-based magnetic refrigeration material. The crystalline gadolinium-based magnetic refrigeration material and the method have the advantages that the method for synthesizing and purifying the crystalline gadolinium-based magnetic refrigeration material is simple and is low in cost, and the crystalline gadolinium-based magnetic refrigeration material is excellent in magnetic refrigeration performance and has an excellent application prospect in the field of low-temperature refrigeration when used as a magnetic refrigerant.
Description
Technical field
The invention belongs to low-temperature refrigeration technology field, and in particular to a kind of low-temperature magnetic refrigeration material：[Gd(L)(DMF)
(H2O)2]n(wherein, L be trans-aconitic acid root anion, DMF is DMF), and preparation method thereof and its
As magnetic refrigerants in the application of low temperature magnetic refrigerating field, belong to low-temperature refrigeration technology field.
Background technology
Into 21 century, countries in the world are paid much attention to energy-conservation and environmental protection, and magnetic Refrigeration Technique have environmental protection,
The advantages of energy-efficient, noise is small, equipment is reliable and stable, meets the requirement of resource, the energy and Environmental costs just, is a kind of
Have free of contamination environmental protection Refrigeration Technique with broad prospects for development, in recent years, receive countries in the world great attention and
It is widely studied.
Since people in 2000 are studied molecule base magnetic refrigerating material, by the development of more than ten years, both at home and abroad
Scholar has designed and has synthesized series based on transition, rare earth metal molecule base magnetic refrigerants such as iron, manganese, gadoliniums.In general, it is preferable
Molecule base magnetic refrigerating material should have big ground state spin S, magnetic anisotropy as small as possible, low energy to excite spin
As far as possible it is ferromagnetic or ferrous magnetic coupling between state, metal ion, ferromagnetic exchange is accounted for leading and big magnetic density or small is matched somebody with somebody
Body/metal quality ratio.[Acc.Chem.Res.2015,48,2834-2842；Inorg.Chem.2015,54,153-160] in view of
Conditions above, during the development and design of molecule base magnetic refrigerating material, it is general from the rare earth with the spin of larger ground state from
Sub- Gd3+Or transition metal ions Mn2+、Fe3+Deng, and magnetic anisotropy is smaller or insignificant Cu2+、Ni2+Plasma.Each
In metal ion species, rare-earth Gd3+Ion has maximum ground state spin, and isotropism, therefore, rare-earth Gd3+Ion is to grind
The ideal chose of molecule base magnetic refrigerants processed.
The content of the invention
The purpose of the present invention is intended to develop a kind of novel crystalline gadolinium base magnetic refrigerating material, while providing the system of this refrigerating material
Preparation Method and its as magnetic refrigerants field of low-temperature refrigeration application.
To achieve the above object, the present invention uses following technical scheme：
A kind of crystalline state gadolinium base magnetic refrigerating material, the molecular formula of the crystalline state gadolinium base magnetic refrigerating material is [Gd (L) (DMF)
(H2O)2]n(wherein, L is trans-aconitic acid root anion, and DMF is DMF), and crystalline state gadolinium base magnetic refrigeration material
The mono-crystalline structures of material have a two-dimensional layered structure, the asymmetric construction unit of described two-dimensional layered structure for a trivalent gadolinium from
Son, trivalent trans-aconitic acid root part, a DMF molecule and two end water of coordination molecule.
The preparation method of described crystalline state gadolinium base magnetic refrigerating material, step is as follows：By gadolinium nitrate, trans-aconitic acid it is water-soluble
Liquid is added in reaction bulb, is subsequently adding DMF, and sodium hydrate aqueous solution is added dropwise under conditions of stirring, and the pH of system is adjusted
To 2.2~3.0, sealed after 5~10min of stirring, 20~48h heated under 85~100 DEG C of constant temperature, be cooled to room temperature,
Filtering, drying at room temperature obtain the gadolinium base magnetic refrigerating material.
The ratio between amount of material of the gadolinium nitrate and trans-aconitic acid is 1:2~20.
With 0.2mmol gadolinium nitrate benchmark, the consumption of the DMF is 2~10mL.
On the basis of 0.2mmol gadolinium nitrates, the concentration of the sodium hydrate aqueous solution is 0.1~2.0mol/L.
Application of the described crystalline state gadolinium base magnetic refrigerating material as magnetic refrigerants in field of low-temperature refrigeration.
Brief description of the drawings
Fig. 1 is the coordination environment of asymmetric gadolinium ion in crystalline state gadolinium base magnetic refrigerating material mono-crystalline structures of the present invention.
Fig. 2 is the coordination mode of trans-aconitic acid part in crystalline state gadolinium base magnetic refrigerating material mono-crystalline structures of the present invention.
Fig. 3 is the two-dimensional layered structure of crystalline state gadolinium base magnetic refrigerating material mono-crystalline structures of the present invention.
Fig. 4 be the crystalline state gadolinium base magnetic refrigerating material for preparing of embodiment 1 theory (under) and actual measurement (on) PXRD schemes.
Fig. 5 is the alternating temperature χ of the crystalline state gadolinium base magnetic refrigerating material that embodiment 1 is preparedMT curve.
Fig. 6 is the crystalline state gadolinium base magnetic refrigerating material for preparing of embodiment 1 in different temperatures, different outer magnetic susceptibility off field
Curve.
Fig. 7 is magnetic entropy of the crystalline state gadolinium base magnetic refrigerating material for preparing of embodiment 1 under different magnetic field, different temperatures
Change-Δ SmCurve.
Specific embodiment
For further explaination is of the invention, a series of embodiments are given below.These embodiments be entirely it is illustrative, they
Only it is used for being specifically described the present invention, is not construed as limitation of the present invention.
Embodiment 1
The preparation method of the crystalline state gadolinium base magnetic refrigerating material of the present embodiment is as follows：
By 200 microlitres of Gd (NO of 1mol/L3)3The aqueous solution and 2000 microlitres of trans-aconitic acids of 0.2mol/L it is water-soluble
Liquid is placed in the bottle of 15mL, is subsequently adding 3mL DMF, in the case of stirring, is added dropwise over the NaOH water of 1mol/L
PH is transferred to 2.5 by solution, and stirring is sealed after 10 minutes, is then placed on 90 DEG C of heated at constant temperature 24h in thermostatic drying chamber, is cooled to room
Temperature, can obtain a large amount of clear crystals, filtering, wash three times, and drying at room temperature obtains crystalline state gadolinium base magnetic refrigerating material, and yield is
0.072g, yield is 82.3%.
(1) characterized as Bruker D8ADVANCE powder x-ray diffractions crystal prototypes to obtained by, gained actual measurement
Peak with theoretical PXRD collection of illustrative plates is consistent (see accompanying drawing 4), and occurs without miscellaneous peak, it was demonstrated that gained crystalline state gadolinium base magnetic freezes
Material purity is good, free from admixture.
(2) crystal data of the crystalline state gadolinium base magnetic refrigerating material of the present embodiment
Its monocrystalline is detected by Bruker D8Quest CMOS single crystal X-ray diffractions instrument, the data obtained is parsed
It is available with refine：Molecular formula is C9H14GdNO9, molecular weight is 437.46, monoclinic system P21/cSpace group, cell parameterα=90 °, β=102.839 (6) °, γ=90 °, structure cell
Volume V=1328.7 (4), density is 2.187g/cm3, Z=4.
(3) the alternating temperature χ of the crystalline state gadolinium base magnetic refrigerating material of the present embodimentMT curve
In 300K, χMT values are 7.90cm3mol-1K, with the theoretical value 7.88cm obtained by an independent gadolinium ion3mol-1K approximately equals (see accompanying drawing 5).With the reduction of temperature, χMT curve slowly rises, and maximum is reached in 150K
7.98cm3mol-1K；Then, χMT values slowly reduce, and minimum value 7.89cm is reached in 38K3mol-1K, finally, χMT values are rapid,
Maximum 8.12cm is reached in 2K3mol-1K。χMT curve exists between gadolinium ion during the rising of low-temperature region illustrates material
Iron magnetic action.However, χMT curve either rises or declines, numerical value change all very littles, and magnetic action is very between illustrating gadolinium ion
It is weak.
(4) magnetic refrigeration performance of the crystalline state gadolinium base magnetic refrigerating material of the present embodiment
Different temperatures (2-7K), the susceptibility data of different magnetic field (0-7T) are shown in accompanying drawing 6, it is known that with the increase of external magnetic field
M-H curves stabilization increases, and saturation value 7.0N β are reached in 2K and 7T.According to formulaFrom M (H,
T) data can calculate their magnetic entropy variate Δ Sm (T) (see accompanying drawing 7), and the increase magnetic entropy variate with Δ H gradually increases,
Magnetic entropy variate-Δ Sm (T) reaches maximum 35.9J Kg when 2K and Δ H is 7T-1K-1, with the molecule base magnetic refrigeration material reported for work
Material is compared, and this magnetic entropy variate belongs to maximum ranks, and in conjunction with the acid resistance of this material, it has important in field of low-temperature refrigeration
Application prospect.
Embodiment 2
The preparation method of the crystalline state gadolinium base magnetic refrigerating material of the present embodiment, step is as follows
By 300 microlitres of Gd (NO of 1mol/L3)3The aqueous solution and 6000 microlitres of trans-aconitic acids of 0.2mol/L it is water-soluble
Liquid is placed in the bottle of 15mL, is subsequently adding 5mL DMF, in the case of stirring, is added dropwise over the NaOH water of 2mol/L
PH is transferred to 3.0 by solution, and stirring is sealed after 8 minutes, is then placed on 100 DEG C of heated at constant temperature 48h in thermostatic drying chamber, is cooled to room
Temperature, filtering, drying at room temperature obtain the gadolinium base magnetic refrigerating material.
Embodiment 3
The preparation method of the crystalline state gadolinium base magnetic refrigerating material of the present embodiment, step is as follows
By 100 microlitres of Gd (NO of 1mol/L3)3The aqueous solution and 5000 microlitres of trans-aconitic acids of 0.2mol/L it is water-soluble
Liquid is placed in the bottle of 15mL, is subsequently adding 6mL DMF, in the case of stirring, is added dropwise over the NaOH water of 1mol/L
PH is transferred to 2.8 by solution, and stirring is sealed after 5 minutes, is then placed on 95 DEG C of heated at constant temperature 24h in thermostatic drying chamber, is cooled to room
Temperature, filtering, drying at room temperature obtain the gadolinium base magnetic refrigerating material.
Embodiment 4
The preparation method of the crystalline state gadolinium base magnetic refrigerating material of the present embodiment, step is as follows
By 500 microlitres of Gd (NO of 1mol/L3)3The aqueous solution and 8000 microlitres of trans-aconitic acids of 0.2mol/L it is water-soluble
Liquid is placed in the bottle of 30mL, is subsequently adding 12mL DMF, in the case of stirring, is added dropwise over the NaOH water of 2mol/L
PH is transferred to 2.0 by solution, and stirring is sealed after 6 minutes, is then placed on 85 DEG C of heated at constant temperature 20h in thermostatic drying chamber, is cooled to room
Temperature, filtering, drying at room temperature obtain the gadolinium base magnetic refrigerating material.
Embodiment 5
The preparation method of the crystalline state gadolinium base magnetic refrigerating material of the present embodiment, step is as follows
By 50 microlitres of Gd (NO of 1mol/L3)3The aqueous solution and 5000 microlitres of aqueous solution of the trans-aconitic acid of 0.2mol/L
It is placed in the bottle of 15mL, is subsequently adding 2.5mL DMF, in the case of stirring, is added dropwise over the NaOH of 0.1mol/L
PH is transferred to 2.5 by the aqueous solution, and stirring is sealed after 10 minutes, is then placed on 90 DEG C of heated at constant temperature 30h in thermostatic drying chamber, is cooled to
Room temperature, filtering, drying at room temperature obtain the gadolinium base magnetic refrigerating material.
General principle of the invention and principal character and advantages of the present invention has been shown and described above.The skill of the industry
Art personnel it should be appreciated that the present invention is not limited to the above embodiments, the simply explanation described in above-described embodiment and specification
Principle of the invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and
Its equivalent thereof.
Claims (6)
1. a kind of crystalline state gadolinium base magnetic refrigerating material, it is characterised in that：The molecular formula of the crystalline state gadolinium base magnetic refrigerating material is [Gd
(L)(DMF)(H2O)2]n(wherein, L is trans-aconitic acid root, and DMF is DMF), the crystalline state gadolinium base magnetic system
The mono-crystalline structures of cold material have a two-dimensional layered structure, the asymmetric construction unit of two-dimensional layered structure for a trivalent gadolinium from
Son, trivalent trans-aconitic acid root part, a DMF molecule and two end water of coordination molecule.
2. the preparation method of crystalline state gadolinium base magnetic refrigerating material according to claim 1, it is characterised in that step is as follows：By nitre
Sour gadolinium, the aqueous solution of trans-aconitic acid are added in reaction bulb, are subsequently adding DMF, and hydroxide is added dropwise under conditions of stirring
Sodium water solution, 2.2 ~ 3.0 are transferred to by the pH of system, are sealed after 5 ~ 10min of stirring, and 20 are heated under 85 ~ 100 DEG C of constant temperature
~ 48h, is cooled to room temperature, and filtering, drying at room temperature obtain the gadolinium base magnetic refrigerating material.
3. the preparation method of crystalline state gadolinium base magnetic refrigerating material according to claim 2, it is characterised in that：The gadolinium nitrate with
The ratio between amount of material of trans-aconitic acid is 1:2~20.
4. the preparation method of crystalline state gadolinium base magnetic refrigerating material according to claim 2, it is characterised in that：With 0.2mmol nitre
Sour gadolinium benchmark, the consumption of the DMF is 2 ~ 10mL.
5. the preparation method of crystalline state gadolinium base magnetic refrigerating material according to claim 2, it is characterised in that：With 0.2mmol nitre
On the basis of sour gadolinium, the concentration of the sodium hydrate aqueous solution is 0.1 ~ 2.0 mol/L.
6. crystalline state gadolinium base magnetic refrigerating material according to claim 1 as magnetic refrigerants in field of low-temperature refrigeration should
With.
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| CN112562959A (en) * | 2020-12-18 | 2021-03-26 | 杭州电子科技大学 | Rare earth dimer coordination polymer low-temperature magnetic refrigeration material and preparation method thereof |
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| CN108987026A (en) * | 2017-06-02 | 2018-12-11 | 中国科学院物理研究所 | Low-temperature magnetic refrigeration material and its preparation method and application based on molecular magnet |
| CN108987026B (en) * | 2017-06-02 | 2021-10-29 | 中国科学院物理研究所 | Low-temperature magnetic refrigeration material based on molecular magnet and preparation method and application thereof |
| CN109134874A (en) * | 2018-07-29 | 2019-01-04 | 桂林理工大学 | A kind of two-dimentional gadolinium based compound and preparation method thereof with magnetic refrigeration effect |
| CN112562959A (en) * | 2020-12-18 | 2021-03-26 | 杭州电子科技大学 | Rare earth dimer coordination polymer low-temperature magnetic refrigeration material and preparation method thereof |
| CN112562959B (en) * | 2020-12-18 | 2024-06-07 | 杭州电子科技大学 | Rare earth dimer coordination polymer low-temperature magnetic refrigeration material and preparation method thereof |
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