CN101456736A - Iridium doped iron base superconductor and preparation method thereof - Google Patents
Iridium doped iron base superconductor and preparation method thereof Download PDFInfo
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- CN101456736A CN101456736A CN 200910058030 CN200910058030A CN101456736A CN 101456736 A CN101456736 A CN 101456736A CN 200910058030 CN200910058030 CN 200910058030 CN 200910058030 A CN200910058030 A CN 200910058030A CN 101456736 A CN101456736 A CN 101456736A
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- smofe
- superconductor
- doped iron
- iron base
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- Superconductors And Manufacturing Methods Therefor (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention discloses an iridium-doped iron-based superconductor. A molecular formula of the iridium-doped iron-based superconductor is SmOFe1-xIrxAs, wherein the x is more than or equal to 0.05 and less than or equal to 0.33. The material has the advantages of steady superconductivity, high superconduction transition temperature, and simple preparation.
Description
Technical field
The present invention relates to a kind of iron-based superconducting material and preparation method thereof.
Background technology
At the beginning of 2008, scientist reports in succession and has found the new high temperature superconducting materia of a class---iron-based superconducting material, caused the extensive concern of scientific circles.The Japan scientist at first finds La[O
1-xF
x] the FeAs compound when critical temperature 26K, have superconducting characteristic.Subsequently, Chinese science the man find again, Sm[O
0.85F
0.15] the FeAs compound becomes superconductor, La when critical temperature 43K
0.87Sr
0.13The OFeAs compound also becomes superconductor when critical temperature 25K.Above superconducting material is all realized by mixing in ReOFeAs (wherein Re represents rare earth element) system.Discover, inject electronics or the hole all might obtain new superconductor, for example, in GdOFeAs, mix Th and can obtain the Gd that critical temperature is 56K by being entrained in the ReOFeAs system
1-xTh
xThe OFeAs superconductor.These a series of iron-based superconducting materials all have identical crystalline structure, and they are similar to copper base superconducting material aspect some.The discovery of new iron-based superconducting material can provide a direction and a thinking more clearly for probing into high-temperature superconductor mechanism.
Summary of the invention
Purpose of the present invention is exactly to propose a kind of new iridium doped iron base superconductor, and the superconductivity of this superconductor is stable, the superconducting transition temperature height, and preparation is simple.
The present invention realizes its goal of the invention, and the technical scheme that is adopted is: a kind of iridium doped iron base superconductor, its molecular formula are SmOFe
1-xIr
xAs, 0.05≤x≤0.33.
Compared with prior art, the invention has the beneficial effects as follows: in the iron SmOFeAs system, Fe
3+Ionic radius be 64pm, and the impurity material Ir that mixes among the present invention
4+The ionic radius is 68pm, their ionic radius is very approaching, thereby the Ir element can substitute the crystalline network that the Fe element in the iron SmOFeAs system enters iron, can not change the crystalline structure of iron SmOFeAs, and can substitute on a large scale.Simultaneously, because Ir
4+Ion ratio Fe
3+Ionic valency height+1 valency is used Ir
4+Ion substitution Fe
3+During ion, give in the iron SmOFeAs system and injected more electronics, electron density is increased, and can adjust iron-based superconducting material SmOFe by the incorporation of adjusting Ir
1-xIr
xThe concentration of electronic carrier in the As system, thereby the iron-based superconducting material SmOFe of change doping Ir
1-xIr
xThe superconductivity of As.
The X-ray diffractogram result of iridium doped iron base superconducting material of the present invention shows that it has four jiaos of ZrCuSiAs type structures, and single phase property is better.The electromagnetic performance measuring result shows, below superconducting transition temperature, observes tangible zero-resistance phenomenon, and has good diamagnetic performance.And its superconducting transition temperature height reaches as high as 21K.As seen, novel material SmOFe of the present invention
1-xIr
xAs has good superconductor applications prospect.
Second purpose of the present invention provides a kind of method for preparing iridium doped iron base superconductor.
The present invention realizes its second goal of the invention, and the technical scheme that is adopted is: a kind of method for preparing iridium doped iron base superconductor, its practice is: with raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of 0.05≤x≤0.33, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, 1150～1170 ℃ of sintering 36～60 hours, promptly.Preparation method of the present invention is simple, and it is convenient to implement.
The above-mentioned all operations except that sintering all carries out under argon shield atmosphere.Do the oxidation that can prevent Sm in the raw material, Fe and As like this, further guarantee to make the amount of oxygen in the thing and accurately control, guarantee to make the supraconductivity of thing by the amount of oxygen in the raw material.Also can avoid simultaneously the injury of deleterious As and oxide compound thereof to operator.
The present invention is further described below in conjunction with accompanying drawing and concrete embodiment.
Description of drawings
Fig. 1 is the SmOFe of the embodiment of the invention one preparation
0.85Ir
0.15The resistivity of As superconductor is with the variation of temperature curve.Wherein: ordinate zou is resistivity (Resistivity), and unit is electromagnetism unit ((m Ω cm)); X-coordinate is a temperature, and unit is K (Kelvin).
Fig. 2 is the SmOFe of the embodiment of the invention one preparation
0.85Ir
0.15The magnetzation curve of As superconductor.Wherein: ordinate zou is magnetic moment (Moment), and unit is electromagnetism unit (emu/g); X-coordinate is a temperature, and unit is K (Kelvin).
Fig. 3 is the SmOFe of the embodiment of the invention one preparation
0.85Ir
0.15The X ray diffracting spectrum of As superconductor.Wherein: ordinate zou is a diffracted intensity, and unit is an arbitrary unit; X-coordinate is diffraction angle 2 θ, and unit is degree (deg).
Fig. 4 is the SmOFe of the embodiment of the invention one preparation
0.85Ir
0.155000 times of scanning electronic microscope (SEM) photos of the amplification of As superconductor and energy spectrogram thereof.
Embodiment
Embodiment one
With raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
0.85Ir
0.15As is SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of x=0.15, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, 1160 ℃ of sintering 36 hours, promptly.
The SmOFe of Fig. 1 for making with the example method
0.85Ir
0.15The resistance of As superconductor is with the variation of temperature curve.Can obviously observe zero-resistance phenomenon by Fig. 1, its superconducting transition temperature is 21K; The SmOFe that Fig. 2 makes for the example method
0.85Ir
0.15The magnetzation curve of As superconductor.As seen from Figure 2, below superconducting transition temperature, its diamagnetic performance is good; The SmOFe of Fig. 3 for making with the example method
0.85Ir
0.15The X ray diffracting spectrum of As superconductor, SmOFe as shown in Figure 3
0.85Ir
0.15The As superconductor has four jiaos of ZrCuSiAs type structures; The SmOFe of Fig. 4 for making with the example method
0.85Ir
0.15The scanning electronic microscope of As superconductor (SEM) photo, the shape characteristic of superconductor sample is a sheet; Illustration among the figure is the energy spectrogram of sheet sample, from containing Sm, Fe, Ir, As, O the obtained as can be seen sample of spectrogram.These test result explanations, novel material SmOFe of the present invention
1-xIr
xAs has good superconductor applications prospect.
Embodiment two
With raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
0.95Ir
0.05As is SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of x=0.05, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, and under 1150 ℃, sintering 48 hours promptly gets SmOFe in vacuum environment
0.95Ir
0.05The As superconductor, it is 13K that experiment records its superconducting transition temperature.
Embodiment three
With raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
0.9Ir
0.1As is SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of x=0.1, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, and under 1160 ℃, sintering 40 hours promptly gets SmOFe in vacuum environment
0.95Ir
0.05The As superconductor, it is 17.2K that experiment records its superconducting transition temperature.
Embodiment four
With raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
0.8Ir
0.2As is SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of x=0.2, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, and under 1150 ℃, sintering 48 hours promptly gets SmOFe in vacuum environment
0.95Ir
0.05The As superconductor, it is 16K that experiment records its superconducting transition temperature.
Embodiment five
With raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
0.75Ir
0.25As is SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of x=0.25, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, and under 1160 ℃, sintering 48 hours promptly gets SmOFe in vacuum environment
0.95Ir
0.05The As superconductor, it is 15.6K that experiment records its superconducting transition temperature.
Embodiment six
Under argon shield atmosphere, with raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
0.7Ir
0.3As is SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of x=0.3, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, and under 1170 ℃, sintering 48 hours promptly gets SmOFe in vacuum environment
0.95Ir
0.05The As superconductor, it is 15.2K that experiment records its superconducting transition temperature.
Embodiment seven
Under argon shield atmosphere, with raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
0.67Ir
0.33As is SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of x=0.33, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, and under 1170 ℃, sintering 60 hours promptly gets SmOFe in vacuum environment
0.95Ir
0.05The As superconductor, it is 15K that experiment records its superconducting transition temperature.
Claims (3)
1, a kind of iridium doped iron base superconductor, its molecular formula are SmOFe
1-xIr
xAs, 0.05≤x≤0.33.
2, a kind of method for preparing the described iridium doped iron base superconductor of claim 1, its practice is: with raw material SmAs, Fe
2O
3, Ir, Fe be according to SmOFe
1-xIr
xAs, the stoichiometric ratio weighing of 0.05≤x≤0.33, ground and mixed is pressed into sheet after evenly and with the tantalum piece parcel, is sealed in then in the vitreosil pipe, 1150～1170 ℃ of sintering 36～60 hours, promptly.
3, the method for preparing iridium doped iron base superconductor as claimed in claim 2 is characterized in that: described all operations except that sintering, all carry out under argon shield atmosphere.
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847482A (en) * | 2010-06-13 | 2010-09-29 | 西南交通大学 | Magnetic material with rich magnetic properties and preparation method thereof |
| CN101847480A (en) * | 2010-06-11 | 2010-09-29 | 西南交通大学 | Magnetic material and preparation method thereof |
| CN101707089B (en) * | 2009-12-15 | 2011-08-10 | 中国科学院电工研究所 | Method for improving upper critical field and critical current density of iron-based superconductor |
| CN107903066A (en) * | 2017-12-01 | 2018-04-13 | 西南交通大学 | A kind of bismuth sulfenyl superconductor and preparation method thereof |
-
2009
- 2009-01-05 CN CN 200910058030 patent/CN101456736A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707089B (en) * | 2009-12-15 | 2011-08-10 | 中国科学院电工研究所 | Method for improving upper critical field and critical current density of iron-based superconductor |
| CN101847480A (en) * | 2010-06-11 | 2010-09-29 | 西南交通大学 | Magnetic material and preparation method thereof |
| CN101847482A (en) * | 2010-06-13 | 2010-09-29 | 西南交通大学 | Magnetic material with rich magnetic properties and preparation method thereof |
| CN101847482B (en) * | 2010-06-13 | 2013-05-22 | 西南交通大学 | Magnetic material with rich magnetic properties and preparation method thereof |
| CN107903066A (en) * | 2017-12-01 | 2018-04-13 | 西南交通大学 | A kind of bismuth sulfenyl superconductor and preparation method thereof |
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Application publication date: 20090617 |