CN104651937B - Magnetic refrigerating material CaFe0.7Co0.3O3Monocrystalline and preparation method thereof - Google Patents
Magnetic refrigerating material CaFe0.7Co0.3O3Monocrystalline and preparation method thereof Download PDFInfo
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- CN104651937B CN104651937B CN201510068308.4A CN201510068308A CN104651937B CN 104651937 B CN104651937 B CN 104651937B CN 201510068308 A CN201510068308 A CN 201510068308A CN 104651937 B CN104651937 B CN 104651937B
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B28/00—Production of homogeneous polycrystalline material with defined structure
- C30B28/02—Production of homogeneous polycrystalline material with defined structure directly from the solid state
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Abstract
The present invention proposes a kind of magnetic refrigerating material, and its chemical formula is CaFe0.7Co0.3O3.And a kind of method for preparing described magnetic refrigerating material, including：CaCO3、Fe2O3、Co3O4Uniformly ground after mixing；First sintering；It is bar-shaped by being pressed into after the product grinding of first sintering；Second of sintering obtains CaFe0.7Co0.3O2.5Polycrystalline rod；With the CaFe0.7Co0.3O2.5Polycrystalline rod is charge bar, grows CaFe by floating zone method0.7Co0.3O2.5Monocrystalline；CaFe0.7Co0.3O2.5Monocrystalline is the same as oxygen source high-temperature high-voltage reaction.CaFe proposed by the present invention0.7Co0.3O3Monocrystalline has excellent magnetothermal effect, and operation temperature area is wider, and refrigerating capacity is big, without precious metal element, suitable for efficient magnetic refrigeration apparatus.
Description
Technical field
The present invention relates to field of magnetic refrigeration material, and in particular to a kind of magnetic refrigerating material CaFe0.7Co0.3O3Monocrystalline and its
Preparation method.
Background technology
Magnetothermal effect (MegnetoCaloric Effect, MCE) refers to the temperature of ferromagnet or paramagnet in adiabatic process
The phenomenon changed with the change of magnetic field intensity is spent, under high-intensity magnetic field, spin order degree rise, maximum system energy reduces, and makes material
Temperature rise, remove magnetic field after, spin order degree reduce, maximum system energy increase, material temperature reduce.Based on magnetothermal effect
Magnetic Refrigeration Technique be traditional air cycle refrigeration technology a kind of alternative, using magnetic Refrigeration Technique instead of air compress
Refrigeration Technique, it is not necessary to using freon, non-environmental-pollution, in addition magnetic Refrigeration Technique also have more efficient, be easy to miniaturization etc.
Advantage.
The efficiency of magnetic Refrigeration Technique is decided by the refrigerating capacity (Refrigerant Capacity, RC) of magnetic refrigerating material,
Wherein, it is magnetic refrigerating material caused Entropy Changes when magnetic field size changes to bear magnetic entropy to become, and is the function of temperature, operation temperature area
The temperature range of refrigeration is efficiently played for magnetic refrigerating material, the magnetic entropy under being changed by specific magnetic fields becomes the halfwidth temperature at peak
Position determines.Improving magnetic refrigerating efficiency needs magnetic refrigerating material to have higher refrigerating capacity.
The content of the invention
In view of this, the present invention proposes a kind of new magnetic refrigerating material CaFe0.7Co0.3O3Monocrystalline and preparation method thereof.
In terms of first time, the present invention proposes a kind of new magnetic refrigerating material：CaFe0.7Co0.3O3Monocrystalline.It is described
CaFe0.7Co0.3O3Monocrystalline has excellent magnetothermal effect, and operation temperature area is wider, and refrigerating capacity is big.
At second of aspect, the present invention proposes a kind of magnetic refrigerating material CaFe0.7Co0.3O3The preparation method of monocrystalline, bag
Include：
CaCO3、Fe2O3、Co3O4It is fully ground after mixing uniformly；
First sintering；
It is bar-shaped by being pressed into after the product grinding of first sintering；
Second of sintering obtains CaFe0.7Co0.3O2.5Polycrystalline rod；
With the CaFe0.7Co0.3O2.5Polycrystalline rod is charge bar, grows CaFe by floating zone method0.7Co0.3O2.5Monocrystalline；
CaFe0.7Co0.3O2.5Monocrystalline is the same as oxygen source high-temperature high-voltage reaction.
Preferably, the CaCO3、Fe2O3、Co3O4According to mol ratio 1:0.35:0.1 uniformly mixing.
Preferably, the temperature of the first sintering be 900-1100 DEG C, the time be 12-48 hours, after the completion of sintering with
2-10 DEG C/min of speed cools to room temperature.
Preferably, the temperature of second sintering be 900-1100 DEG C, the time be 12-48 hours, after the completion of sintering with
2-10 DEG C/min of speed cools to room temperature.
Preferably, the floating zone method growth CaFe0.7Co0.3O2.5Monocrystalline is with CaFeO2.5For seed crystal.
Preferably, the oxygen source is selected from KClO3、KClO4、NaClO3、NaClO4、Na2O2、 Ag2O2One kind in powder.
Preferably, the oxygen source is made to be uniformly distributed in CaFe0.7Co0.3O2.5Sealed around monocrystalline and with gold size capsule.
Preferably, KClO4Powder is the same as the CaFe0.7Co0.3O2.5The mass ratio of monocrystalline is not less than 0.3.
Preferably, the device of the high-temperature high-voltage reaction is that cubic hinge press or 6-8 types two level promote press, course of reaction
In pressure be 2-10GPa, temperature is 600-1000 DEG C, minute in reaction time 10-60.
New magnetic refrigerating material CaFe proposed by the present invention0.7Co0.3O3Monocrystalline has operation temperature area wider, and refrigerating capacity is big
The advantages of, suitable for efficient magnetic refrigeration apparatus.
Brief description of the drawings
By the description to the embodiment of the present invention referring to the drawings, above-mentioned and other purpose of the invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 is CaFe prepared by embodiment 10.7Co0.3O3The negative magnetic entropy varied curve of monocrystalline；
Fig. 2 is refrigerating capacity curve prepared by embodiment 1.
Embodiment
Below to the present invention detailed description in, it is detailed to describe some specific detail sections.To art technology
The description of part can also understand the present invention completely without these details for personnel.In order to avoid obscuring the essence of the present invention,
The not narration in detail of known method, process, flow, element and circuit.In addition, those of ordinary skill in the art should manage
Solution, accompanying drawing is provided to the purpose of explanation provided herein, and accompanying drawing is not necessarily drawn to scale.
Unless the context clearly requires otherwise, otherwise entire disclosure is similar with the " comprising " in claims, "comprising" etc.
Word should be construed to the implication included rather than exclusive or exhaustive implication；That is, it is containing for " including but is not limited to "
Justice.In the description of the invention, it is to be understood that term " first time ", " for the second time " etc. are only used for describing purpose, and can not
It is interpreted as indicating or implying relative importance.
The present invention relates to a kind of new magnetic refrigerating material CaFe0.7Co0.3O3Monocrystalline and preparation method thereof.As the present invention's
One preferred embodiment, CaFe proposed by the present invention0.7Co0.3O3Monocrystalline can be prepared by following steps：
Purity is higher than 99.9% CaCO3、Fe2O3、Co3O4According to mol ratio 1:0.35:It is fully ground after 0.1 mixing
Uniformly；
First sintering, the device of the first sintering can be crucible and Muffle furnace；
It is bar-shaped by being pressed into after the product grinding of first sintering；
Second of sintering obtains CaFe0.7Co0.3O2.5Polycrystalline rod, the device of second of sintering can be crucible and horse
Not stove；
With CaFe0.7Co0.3O2.5Polycrystalline rod is charge bar, grows CaFe by floating zone method0.7Co0.3O2.5Monocrystalline；
CaFe0.7Co0.3O2.5Monocrystalline with oxygen source high-temperature high-voltage reaction, wherein, the oxygen source be selected from KClO3、KClO4、
NaClO3、NaClO4、Na2O2、Ag2O2One kind in powder, the device of the high-temperature high-voltage reaction is cubic hinge press or 6-8 types
Two level promotes press.
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.
Embodiment 1：
Purity is higher than 99.9% CaCO3、Fe2O3、Co3O4According to mol ratio 1:0.35:It is fully ground after 0.1 mixing
Uniformly obtain mixed material 1.
Mixed material 1 is put into crucible and the first sintering in Muffle furnace, the temperature of the first sintering is 1000
DEG C, the time be 24 hours, cool to room temperature with 4 DEG C/min of speed after the completion of sintering and obtain sintered product 2.
Sintered product 2 is pulverized and last diameter about 5mm, length about 10cm rod-like samples are pressed into by hydraulic press
3。
The rod-like samples 3 are put into crucible and second of sintering in Muffle furnace, the temperature of second of sintering is
1000 DEG C, the time be 24 hours, cool to room temperature with 4 DEG C/min of speed after the completion of sintering and obtain CaFe0.7Co0.3O2.5Polycrystalline
Rod.
With CaFe0.7Co0.3O2.5Polycrystalline rod is charge bar, with CaFeO2.5Grown for seed crystal by floating zone method
CaFe0.7Co0.3O2.5Monocrystalline, melting zone are highly approximately equal to width, and upper lower beam downstream rate and rotating speed are respectively 2mm/ hours and 20
Rev/min.
With diamond cutting turning cutter by gained CaFe0.7Co0.3O2.5Monocrystalline is cut into height about 4mm, and with sand paper by diameter
Mill is about 3.7mm, with KClO4Powder is together put into the sealing of gold size capsule, wherein CaFe0.7Co0.3O2.5Monocrystalline and KClO4The matter of powder
Amount is than being 1:0.38, KClO4Powder is evenly distributed on CaFe0.7Co0.3O2.5Around single crystal ingot.
Using cubic hinge press high temperature high pressure process, pressure 6GPa, temperature are 800 DEG C, the time is 30 minutes.
Fig. 1 is CaFe prepared by embodiment 10.7Co0.3O3The negative magnetic entropy varied curve of monocrystalline, from Fig. 1 extractions in different magnetic
It is as shown in table 1 that negative magnetic entropy under field intensity becomes maximum, operation temperature area and the refrigerating capacity that is calculated.CaFe0.7Co0.3O3It is single
Crystalline substance has the advantages of operation temperature area is wider, and refrigerating capacity is big.
Negative magnetic entropy under table 1, different magnetic field intensity becomes maximum, operation temperature area and refrigerating capacity
Fig. 2 is refrigerating capacity curve prepared by embodiment 1, and when magnetic field intensity is 6T, refrigerating capacity reaches 354.1J/
kg。
CaFe proposed by the present invention0.7Co0.3O3Monocrystalline has excellent magnetothermal effect, and operation temperature area is wider, refrigerating capacity
Greatly, without precious metal element, suitable for efficient magnetic refrigeration apparatus.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For, the present invention can have various changes and change.All any modifications made within spirit and principles of the present invention, it is equal
Replace, improve etc., it should be included in the scope of the protection.
Claims (8)
1. a kind of method for preparing magnetic refrigerating material, including：
CaCO3、Fe2O3、Co3O4It is fully ground after mixing uniformly；
First sintering；
It is bar-shaped by being pressed into after the product grinding of first sintering；
Second of sintering obtains CaFe0.7Co0.3O2.5Polycrystalline rod；
With the CaFe0.7Co0.3O2.5Polycrystalline rod is charge bar, with CaFeO2.5For seed crystal, grown by floating zone method
CaFe0.7Co0.3O2.5Monocrystalline；
CaFe0.7Co0.3O2.5Monocrystalline forms the CaFe with oxygen source high-temperature high-voltage reaction0.7Co0.3O3Monocrystalline is as magnetic cooling material
Material, the magnetic cooling material under 2T magnetic field intensity operation temperature area between 157-270K.
2. the preparation method of magnetic refrigerating material according to claim 1, wherein, the CaCO3、Fe2O3、Co3O4According to rubbing
That ratio 1:0.35:0.1 uniformly mixing.
3. the preparation method of magnetic refrigerating material according to claim 1, wherein, the temperature of the first sintering is 900-
1000 DEG C, the time be 12-48 hours, room temperature is cooled to 2-10 DEG C/min of speed after the completion of sintering.
4. the preparation method of magnetic refrigerating material according to claim 1, wherein, the temperature of second of sintering is 900-
1100 DEG C, the time be 12-48 hours, room temperature is cooled to 2-10 DEG C/min of speed after the completion of sintering.
5. the preparation method of magnetic refrigerating material according to claim 1, wherein, the oxygen source is selected from KClO3、KClO4、
NaClO3、NaClO4、Na2O2、Ag2O2One kind in powder.
6. the preparation method of magnetic refrigerating material according to claim 5, wherein, it is uniformly distributed in the oxygen source
CaFe0.7Co0.3O2.5Sealed around monocrystalline and with gold size capsule.
7. the preparation method of magnetic refrigerating material according to claim 5, wherein, KClO4Powder is the same as described
CaFe0.7Co0.3O2.5The mass ratio of monocrystalline is not less than 0.3.
8. the preparation method of magnetic refrigerating material according to claim 1, wherein, the device of the high-temperature high-voltage reaction is six
Face high pressure apparatus or 6-8 types two level promote press, the pressure in course of reaction is 2-10GPa, temperature is 600-1000 DEG C, reaction when
Between 10-60 minutes.
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| CN1197853A (en) * | 1997-03-12 | 1998-11-04 | 株式会社村田制作所 | Single crystal growth method |
| CN2556210Y (en) * | 2002-08-07 | 2003-06-18 | 中国科学院物理研究所 | Device of controlling inoculating crystal direction for use in crystal growing process |
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