Claims
- 1. A material having at least one superconducting phase and having the composition represented by the formula Y.sub.w Ba.sub.v Cu.sub.x O.sub.y F.sub.z, where w is about 1, v is about 2, x is about 3, y is from about 6.5 to about 10.5 and z is from about 0.1 to about 4.
- 2. A material having at least one superconducting phase and having the composition represented by the formula Y.sub.w Ba.sub.v Cu.sub.x O.sub.y F.sub.z, where w is about 1, v is about 2, x is about 3, y is from about 6.5 to about 10.5 and z is from about 0.1 to about 4;
- said material formed by the method including the steps of:
- a. forming a mixture of materials, said mixture of materials including the elements Y, Ba, Cu, O and F;
- b. pressing the mixture into a cohesive solid mass; and
- c. heating the solid mass in an oxidizing environment to form a material having at least one superconducting phase.
- 3. The material of claim 2 wherein said step of forming said mixture of materials includes the further step of forming said mixture from at least two separate precursor mixtures.
- 4. The material of claim 3 wherein the step of forming said mixture from at least two separate precursor mixtures includes the steps of forming the first of said precursor mixtures including the elements Y, Ba, Cu and O, forming the second of said precursor mixtures including the elements Y, Ba, Cu, O and F and mixing the precursor mixtures.
- 5. The material of claim 4 wherein said step of forming said mixture of materials further includes the step of heating said precursor mixtures before mixing the precursor mixtures.
- 6. The material of claim 5 wherein said step of heating said precursor mixtures includes a first step of heating said precursor mixtures in air at a temperature of about 950.degree. C. for about 8 hours and a second step of heating said precursor mixtures in air at a temperature of about 200.degree. C. for about 16 hours.
- 7. The material of claim 2 wherein said step of heating the solid mass in an oxidizing environment includes the step of heating said solid mass in a gas including oxygen.
- 8. The material of claim 2 wherein said step of heating the solid mass includes the steps of increasing the temperature of said solid mass from about 200.degree. C. to about 950.degree. C. in about 6 hours, holding the temperature of said mass at about 950.degree. C. for about 48 hours and reducing the temperature of said mass from about 950.degree. C. to about 200.degree. C. in about 6 hours.
Parent Case Info
This patent application Ser. No. 07/826,290 is a continuation of pending patent application Ser. No. 07/542,670 filed on Jun. 22, 1990 now abandoned, which is a continuation of a application Ser. No. 07/370,959 filed on Jun. 23, 1989 and now abandoned which is a continuation of application Ser. No. 07/240,289 filed on Sep. 6, 1988 and now abandoned which is a continuation of application Ser. No. 07/043,279 filed on Apr. 27, 1987 and now abandoned.
Non-Patent Literature Citations (4)
Entry |
Bednorz et al.; "Possible High Tc Superconductivity in the Ba-La-Cu-O System", Z. Phys. B,--Condensed Matter 64, 189-193 (1986). |
Uchida, et al.; "High Tc Superconductivity of La-Ba-Cu Oxides", Japan Journal Applied Physics, vol. 26, No. 1, Jan. 1987, pp. L1-L2. |
Takagi et al.; "High-Tc Superconductivity of La-Ba-Cu Oxides II,--Specification of the Super Conducting Phase"; Japanese Journal Applied Physics, vol. 26, No. 2 Feb. 1987 pp. L123-L124. |
Uchida, et al.; "High-Tc Superconductivity of La-Ba-Cu Oxides III--Electrical Resistivity Measurement"; Japanese Journal of Applied Physics, vol. 26, No. 2, Feb. 1987, pp. L151-L152. |
Continuations (4)
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Number |
Date |
Country |
Parent |
542670 |
Jun 1990 |
|
Parent |
370959 |
Jun 1989 |
|
Parent |
240289 |
Sep 1988 |
|
Parent |
43279 |
Apr 1987 |
|