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US 5,314,867 AGranted
Process for making Tl-Ba-Ca-Cu-O superconductors using thallium vapor
AssigneeUniversity of Arkansas
InventorsAllen M. Hermann, Zhengzhi Sheng
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Abstract
A process of making high temperature Tl-based superconductors. The process includes the steps of reacting solid Ba--Ca--Cu-oxides with Tl.sub.2 O.sub.3 vapor. The process allows high quality Tl-based superconductors to be easily fabricated.
Claims6
A method for making high temperature superconductors, comprising the steps of:
- a. preparing Ba--Ca--Cu-oxides;
- and thereafter
- b. reacting Tl.sub.2 O.sub.3 vapor and solid Ba--Ca--Cu-oxides to form Tl--Ba--Ca--Cu--O superconductors.
A method for making high temperature superconductors comprising the steps of:
- a. grinding a mixture of a compound selected from the group consisting of CaCO.sub.3, CaO, a compound selected from the group consisting of BaCo.sub.3 and BaO.sub.2, and CuO and heating the ground mixture to obtain a uniform black Ba--Ca--Cu--O powder;
- b. pressing the resulting Ba--Ca--Cu--O powder into a pellet;
- c. heating the pellet;
- d. allowng the pellet to cool;
- e. placing the pellet near an amount of Tl.sub.2 O.sub.3 ;
- f. making the pellet into a wire shape;
- g. heating the wire shape and Tl.sub.2 O.sub.3 so that at least a portion of the Tl.sub.2 O.sub.3 vaporizes;
- and
- h. allowing the resultant product to cool.
6 more elements
A method for making thin-film Tl--Ca--Ba--Cu--O superconductors comprising the steps of:
- a. depositing a thin-film of Ca--Ba--Cu--O precursor utilizing physical vapor deposition;
- b. placing Tl.sub.2 O.sub.3 in a platinum boat under or near the precursor thin film;
- c. heating the platinum boat and precursor film in flowing O.sub.2 ;
- and
- d. cooling the film and platinum boat.
2 more elements
A method for making high temperature superconductors, comprising the steps of:
- a. preparing Ba--Ca--Cu-oxides;
- and thereafter
- b. reacting Tl.sub.2 O.sub.3 vapor and solid Ba--Ca--Cu-oxides having a nominal composition substantially represented by the formula:
- BaCa.sub.x Cu.sub.y O.sub.1+x+y
- wherein:
- 0<x<100;
- and 0.01<y<100
- to form Tl--Ba--Ca--Cu--O superconductors.
5 more elements
Dependencies are inferred from the claim text.