CN1143061A - Single phase Bi2Sr2Ca2Cu3O10+delt high temperature superconducting phase step synthetic method - Google Patents

Single phase Bi2Sr2Ca2Cu3O10+delt high temperature superconducting phase step synthetic method Download PDF

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CN1143061A
CN1143061A CN96107813A CN96107813A CN1143061A CN 1143061 A CN1143061 A CN 1143061A CN 96107813 A CN96107813 A CN 96107813A CN 96107813 A CN96107813 A CN 96107813A CN 1143061 A CN1143061 A CN 1143061A
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mixing
admixtion
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CN1048706C (en
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王民权
熊国鸿
洪樟连
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Zhejiang University ZJU
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

During the synthesis, intermediate phase is first sintered by using Bi2O3, SrCO3 and CaCO3 as material and through mixing, ball grinding and sintering, and then sintered into No.2212 superconducting phase through mixing with SrCO3, CaCO3 and CuO, ball grinding and sintering. The No.2212 phase is finally sintered into No.2223 phase by adding SrCO3, CaCO3, CuO and PbO, mixing with No.2223 superconducting phase in 0-5 wt%, ball grinding and sintering. The present invention can raise the forming speed of No.2223 superconducting phase, expand its forming temp. range and raise its critical current density.

Description

Single phase property Bi 2Sr 2Ca 2Cu 3O 10+ δThe stepwise synthesis method of high-temperature superconductor phase
The present invention relates to a kind of preparation single phase property Bi 2Sr 2Ca 2Cu 3O 10+ δThe novel method of high-temperature superconductor especially relates to via Bi 2Sr xCa 2-xO 5Intermediate phase, synthetic successively Bi 2Sr 2Ca 1Cu 2O 8+ δ(2212) and Bi 2Sr 2Ca 2Cu 3O 10+ δ(2223) the stepwise synthesis method of superconducting phase.
The Bi series superconducting material has multiple superconducting phase, and its general formula is Bi 2Sr 2Ca N-1Cu nO 2 (n+2)+δ, work as n=1,2 and 3 o'clock, be respectively Bi 2Sr 2Cu 1O 6+ δ(2201) phase, Bi 2Sr 2Ca 1Cu 2O 8+ δ(2212) phase and Bi 2Sr 2Ca 2Cu 3O 10+ δ(2223) phase, its superconducting transition temperature is respectively about 20K, 85K and 110K.The Bi series superconducting material have superconducting transition temperature height, good stability, nontoxic, do not contain rare earth, abundant raw material and advantage such as inexpensive, and its superconducting phase structure is remarkable stratiform, can cause texture by melting texture technology or deformation texture technology, improve so that eliminate the weak connectivity problem of crystal boundary.Therefore, except that Y-Ba-Cu-O was available melting texture technology, Bi system adopted the high-quality band of texturing of silver-colored sheathing process preparation at present, and its critical current density jc has reached 10 5A/cm 2(OT 77K), has showed the possible prospect that the high-temperature superconductor forceful electric power is used.
Except the preparation of low-dimensional materials such as film, at present, the solid phase process for calcining is adopted in the oxide superconductor preparation mostly.For Bi system, promptly with Bi 2O 3, SrCO 3, CaCO 3, CuO etc. is as raw material, by 2223 mutually name form, make admixtion, after grinding, mixing and moulding, directly burn till and get.But, Bi states in three superconducting phases because of fastening, 2201 and 2212 are easier to obtain the single phase property material by solid state reaction or melt crystallization, and the 2223 high-temperature superconductor phases of Tc=110K, but very slow because of its speed of response, and the formation temperature scope is narrow, and be difficult to synthetic good single phase property material, thereby extensive concern and research have been caused.Comprise for solving the present way that generally adopts of this difficult problem: (1) adds an amount of PbO, forms mutually to quicken 2223, and widens its formation temperature scope; (2) accurately control firing temperature and atmosphere; (3) prolong firing time significantly; (4) optimize and the accurate composition etc. of controlling.Yet even so, still have following problem: (1) firing time still need reach about 200h (Phys.Rev.B, 40[7] 5266 (1989)); (2) still often have a small amount of 2201 to deposit together, be difficult for obtaining high-quality unisexuality phase material; (3) because Bi is in the superconducting phase, Sr/Ca all is solid solution condition, formation temperature, scope, speed and electromagnetic performance thereof are all influential mutually to 2223 with structure for its solid solution capacity, and the direct once-firing method of admixtion that adopts at present, are difficult to Sr/Ca solid solution behavior is regulated and control etc.
The purpose of this invention is to provide a kind of single phase property Bi 2Sr 2Ca 2Cu 3O 10+ δThe stepwise synthesis method of high-temperature superconductor phase.
The present invention takes following measures in order to achieve the above object:
At first, with Bi 2O 3, SrCO 3, CaCO 3Being raw material, is Bi: Sr: Ca=2: x by atomic ratio: (2-x) (x=0～1.50) preparation admixtion, and through mixing, ball milling 2～3h, compression molding burns till 5～15h in 780～850 ℃, and promptly getting intermediate phase Bi-Sr-Ca-O is sosoloid, and it consists of: Bi 2Sr xCa 2-xO 5, wherein x=0～1.50 belong to oblique system, and its brilliant full parameter is different and different, as shown in table 1 with the x value.
Then, be raw material with above-mentioned synthetic intermediate phase, add SrCO 3, CaCO 3The atomic ratio that admixtion is formed with CuO is Bi: (Sr+Ca): Cu=2: (wherein 1/2≤Sr/Ca≤5) admixtion was after mixing and ball milling in 3: 2, compression molding, burn till 10～15h in 780～840 ℃ and promptly get 2212 superconducting phases, its Sr/Sr+Ca solid solubility and structure are subjected to intermediate phase solid solution Characteristics Control.
At last, with above-mentioned be raw material mutually via intermediate phase synthetic 2212, add CaCO 3, SrCO 3, to make the admixtion atomic ratio be Bi: Pb: (Sr+Ca): Cu=(1.75～1.90) for CuO and PbO: (0.25～0.40): (3.90～4.00): 3 (wherein 0.68≤Sr/Ca≤1.16), add 0～5wt% 2223 after mixing and ball milling, compression molding is in 800～865 ℃, after burning till 20～30h, grind and heavily burn 10～100h, promptly get 2223 superconducting materials that do not have the 2201 high single phase property that coexist mutually.
The present invention compares with the direct synthetic method of present employing, has following advantage:
1. effectively improve 2223 superconducting phases and form speed, make its firing time, shorten to about 50h (as Sr/Ca ≈ 1: 1) significantly from 200h.
2. widen 2223 phase formation temperature scopes, be convenient to control an amount of amount of liquid phase, prevent and eliminate a small amount of 2201 or 2212 mutually residual, improve the single phase property and the quality of synthetics.
Can by adjust, the Sr-Ca solid solution feature of control intermediate phase, control and improve its supraconductivity.
4. on this basis, be expected to provide a kind of, Sr-Ca solid solution defective through carefully controlling introducing or precipitate are as the flux pinning center, to improve its critical current density.
Be illustrated below in conjunction with embodiment.
At first, with Bi 2O 3, SrCO 3, CaCO 3Being raw material, is Bi: Sr: Ca=2: x by atomic ratio: (2-x) (x=0.8～1.20) preparation admixtion, and through mixing, ball milling 2～3h, compression molding burns till 8～12h in 790～830 ℃, and promptly getting intermediate phase Bi-Sr-Ca-O is sosoloid, and it consists of: Bi 2Sr x, Ca 2-xO 5, x=0.8～1.20 wherein;
Then, be raw material with above-mentioned synthetic intermediate phase, add SrCO 3, CaCO 3The atomic ratio that admixtion is formed with CuO is Bi: (Sr+Ca): Cu=2: 3: 2 (wherein 1.50≤Sr/Ca≤2.75) admixtiones are after mixing and ball milling, and compression molding burns till 8～12h in 790～830 ℃ and promptly gets 2212 superconducting phases;
At last, with above-mentioned be raw material mutually via intermediate phase synthetic 2212, add CaCO 3, SrCO 3, to make the admixtion atomic ratio be Bi: Pb: (Sr+Ca): Cu=(1.75～1.90) for CuO and PbO: (0.30～0.40): (3.90～4.00): 3 (wherein 0.75≤Sr/Ca≤1.10), add 0～5wt% 2223 after mixing and ball milling, compression molding is in 800～850 ℃, after burning till 20～30h, grind and heavily burn 20～50h, promptly get 2223 superconducting materials that do not have the 2201 high single phase property that coexist mutually.
Embodiment:
Use analytical pure Bi 2O 3, SrCO 3, CaCO 3, CuO and PbO be raw material, is Bi: Sr: Ca=2 by atomic ratio: be mixed with admixtion at 1: 1, mix and behind ball mill for dry grinding 3h,, burn till 1h and 825 ± 5 ℃ in 785 ± 5 ℃ in regular turn and burn till 10h, make and consist of Bi in the moulding of 250～300MPa lower sheeting 2SrCaO 5Intermediate phase.
In the above-mentioned intermediate phase of per 100 grams, add 23.59 gram SrCO 3, 25.42 gram CuO, mixing and ball milling 2.5h, back compression molding burns till 1 and 10h respectively in 785 ± 5 ℃ and 825～830 ℃, promptly obtains Bi 2Sr 2Ca 1Cu 2O 3+ δPhase.As raw material, add 1.83 gram SrCO in per 100 grams respectively again 3, 13.74 the gram CaCO 3, 11.91 the gram CuO and 9.55 the gram PbO, add 3～5wt%2223 simultaneously and make nucleus mutually.In the 300MPa lower sheeting, 800 ± 5 ℃ and 855 ℃ are burnt 2h and 30h respectively to admixtion through mixing, ball milling 2～3h, grind, heavily burn 20h, promptly get single-phase Bi 2Sr 2Ca 2Cu 3O 10+ δPhase.
Table 1 intermediate phase (Bi 2Sr xCa 2-xO 5) the unit cell parameters intermediate phase form a (nm) b (nm) c (nm) β (deg) unit cell volume
v(nm 3)Bi 2Ca 2O 5 1.8363 0.5366 1.4670 100.26 1.42241Bi 2Sr 0.5Ca 1.5O 5 1.8563 0.5356 1.4820 99.95 1.45129Bi 2Sr 0.66Ca 1.34O 5?1.8588 0.5345 1.4869 99.96 1.45501Bi 2SrCaO 5 1.8661 0.5341 1.4952 100.03 1.46747Bi 2Sr 1.34Ca 0.66O 5?1.8676 0.5330 1.4983 100.04 1.46861Bi 2Sr 1.5Ca 0.5O 5 1.8761 0.5331 1.5014 100.08 1.47845

Claims (2)

1. single phase property Bi 2Sr 2Ca 2Cu 3O 10+ δThe stepwise synthesis method of high-temperature superconductor phase is characterized in that:
At first, with Bi 2O 3, SrCO 3, CaCO 3Being raw material, is Bi: Sr: Ca=2: x by atomic ratio: (2-x) (x=0～1.50) preparation admixtion, and through mixing, ball milling 2～3h, compression molding burns till 5～15h in 780～850 ℃, and promptly getting intermediate phase Bi-Sr-Ca-O is sosoloid, and it consists of: Bi 2Sr xCa 2-xO 5, x=0～1.50 wherein;
Then, be raw material with above-mentioned synthetic intermediate phase, add SrCO 3, CaCO 3The atomic ratio that admixtion is formed with CuO is Bi: (Sr+Ca): Cu=2: 3: 2 (wherein 1/2≤Sr/Ca≤5) admixtiones are after mixing and ball milling, and compression molding burns till 10～15h in 780～840 ℃ and promptly gets 2212 superconducting phases;
At last, with above-mentioned be raw material mutually via intermediate phase synthetic 2212, add CaCO 3, SrCO 3, to make the admixtion atomic ratio be Bi: Pb: (Sr+Ca): Cu=(1.75～1.90) for CuO and PbO: (0.25～0.40): (3.90～4.00): 3 (wherein 0.68≤Sr/Ca≤1.16), add 0～5wt% 2223 after mixing and ball milling, compression molding is in 800～850 ℃, after burning till 20～30h, grind and heavily burn 10～100h, promptly get 2223 superconducting materials that do not have the 2201 high single phase property that coexist mutually.
2. a kind of single phase property Bi according to claim 1 2Sr 2Ca 2Cu 3O 10+ δThe stepwise synthesis method of high-temperature superconductor phase is characterized in that:
At first, with Bi 2O 3, SrCO 3, CaCO 3Being raw material, is Bi: Sr: Ca=2: x by atomic ratio: (2-x) (x=0.8～1.20) preparation admixtion, and through mixing, ball milling 2～3h, compression molding burns till 8～12h in 790～830 ℃, and promptly getting intermediate phase Bi-Sr-Ca-O is sosoloid, and it consists of: Bi 2Sr xCa 2-xO 5, x=0.8～1.20 wherein;
Then, be raw material with above-mentioned synthetic intermediate phase, add SrCO 3, CaCO 3The atomic ratio that admixtion is formed with CuO is Bi: (Sr+Ca): Cu=2: 3: 2 (wherein 1.50≤Sr/Ca≤2.75), admixtion are after mixing and ball milling, and compression molding burns till 8～12h in 790～830 ℃ and promptly gets 2212 superconducting phases;
At last, with above-mentioned be raw material mutually via intermediate phase synthetic 2212, add CaCO 3, SrCO 3, to make the admixtion atomic ratio be Bi: Pb: (Sr+Ca): Cu=(1.80～1.90) for CuO and PbO: (0.30～0.40): (3.90～4.00): 3 (wherein 0.75≤Sr/Ca≤1.10), add 0～5wt% 2223 after mixing and ball milling, compression molding is in 800～850 ℃, after burning till 20～30h, grind and heavily burn 20～50h, promptly get 2223 superconducting materials that do not have the 2201 high single phase property that coexist mutually.
CN96107813A 1996-05-21 1996-05-21 Single phase Bi2Sr2Ca2Cu3O10+delt high temperature superconducting phase step synthetic method Expired - Fee Related CN1048706C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101061555B (en) * 2005-04-06 2011-01-05 住友电气工业株式会社 Process for producing bismuth-based oxide superconductor, and superconductive wire
CN106478083A (en) * 2016-10-13 2017-03-08 天津大学 A kind of low sintering preparation method of strontium silicate copper system microwave-medium ceramics
CN109786025A (en) * 2019-01-28 2019-05-21 安庆市泽烨新材料技术推广服务有限公司 A kind of preparation method of modified Bismuth-system superconductor

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* Cited by examiner, † Cited by third party
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JPS649813A (en) * 1987-01-27 1989-01-13 Agency Ind Science Techn Superconductor and production thereof
EP0277749B1 (en) * 1987-01-30 1995-08-30 Hitachi, Ltd. Oxide-superconductor
DE3854134T2 (en) * 1987-04-07 1996-01-18 Fujikura Ltd Superconducting oxide and process for its production.
JP2804039B2 (en) * 1988-02-24 1998-09-24 株式会社東芝 Compound superconductor and method for producing the same
JPH0712928B2 (en) * 1989-03-13 1995-02-15 学校法人東海大学 Superconducting article manufacturing method
DE4124823A1 (en) * 1991-07-26 1993-01-28 Hoechst Ag HIGH TEMPERATURE SUPER LADDER AND METHOD FOR THE PRODUCTION THEREOF

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101061555B (en) * 2005-04-06 2011-01-05 住友电气工业株式会社 Process for producing bismuth-based oxide superconductor, and superconductive wire
CN106478083A (en) * 2016-10-13 2017-03-08 天津大学 A kind of low sintering preparation method of strontium silicate copper system microwave-medium ceramics
CN109786025A (en) * 2019-01-28 2019-05-21 安庆市泽烨新材料技术推广服务有限公司 A kind of preparation method of modified Bismuth-system superconductor

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