Title:
THIN FILM Hg-BASED SUPERCONDUCTORS, THERMOELECTRIC MATERIALS AND METHODS OF FABRICATION THEREOF
Document Type and Number:
WIPO Patent Application WO2001031659
Kind Code:
A3
Abstract:
Improved Hg-containing superconducting films and thermoelectric materials are provided. The films are fabricated by annealing starting T1-containing films (e.g., T1-1212 or T1-2212) in an Hg-vapor environment so as to cause a substitution of T1 by Hg without substantial alteration of the crystalline structure of the starting films. Preferably, a body comprising a substrate having an epitaxial T1-containing film thereon is annealed under vacuum conditions with a Hg-based bulk; typical annealing conditions are 600-900 DEG C for a period of from about 1-20 hours. The final Hg-containing film products have a Jc of at least about 10<6> A/cm<2> (100 K, OT) and a Xmin of up to about 50 %. The thermoelectric materials are prepared by perturbing a crystalline precursor having a structure similar to the final material so as to cause a first molecule to be released from the precursor. A vapor is introduced into the reaction system simultaneous to or shortly after the perturbation step so as to cause molecules which are within the vapor and are different than the first molecules to replace the first molecules in the precursor.
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Inventors:
WU JUDY
YAN SHAO LIN
XIE YIUAN
YAN SHAO LIN
XIE YIUAN
Application Number:
PCT/US2000/029818
Publication Date:
November 01, 2001
Filing Date:
October 25, 2000
Export Citation:
Assignee:
UNIV KANSAS (US)
International Classes:
C30B29/22; C30B33/02; H01L35/14; H01L35/18; H01L35/22; C30B1/04; H01L35/34; H01L39/24; (IPC1-7): C01F17/00; H01B1/06; H01L35/14; C04B35/50; C23C14/08
Foreign References:
| US5769943A | 1998-06-23 | |||
| US6069312A | 2000-05-30 | |||
| US5994639A | 1999-11-30 |
Other References:
HILTON ET AL.: "Growth, patterning and weak-link fabrication of superconducting YBaCuO thin films", APPL. PHYS. LETT., vol. 53, no. 12, 12 September 1988 (1988-09-12), pages 1107 - 1109, XP000029653
MENG ET AL.: "Synthesis of the high temperature superconductors HgBa2CaCu2O6 and HgBa2Ca2Cu3O8", PHYSICA C, vol. 216, 1993, pages 21 - 28, XP002939943
MORIWAKI ET AL.: "Epitaxial HgBa2Ca2Cu2Oy films on SrTiO3 substrates prepared by spray pyrolysis technique", APPL. PHYS. LETT., vol. 69, no. 22, 25 November 1996 (1996-11-25), pages 3423 - 3425, XP000643652
YUN ET AL.: "Growth of HgBa2Ca2Cu3Oy thin films on LaA1O3 substrates using fast temperature ramping Hg-vapor annealing", APPL. PHYS. LETT., vol. 68, no. 18, 29 April 1996 (1996-04-29), pages 2565 - 2567, XP000588296
YU ET AL.: "HgBa2CaCu2Oy superconducting thin films prepared by laser ablation", PHYSICA C, vol. 289, 1997, pages 199 - 202, XP004102828
MENG ET AL.: "Synthesis of the high temperature superconductors HgBa2CaCu2O6 and HgBa2Ca2Cu3O8", PHYSICA C, vol. 216, 1993, pages 21 - 28, XP002939943
MORIWAKI ET AL.: "Epitaxial HgBa2Ca2Cu2Oy films on SrTiO3 substrates prepared by spray pyrolysis technique", APPL. PHYS. LETT., vol. 69, no. 22, 25 November 1996 (1996-11-25), pages 3423 - 3425, XP000643652
YUN ET AL.: "Growth of HgBa2Ca2Cu3Oy thin films on LaA1O3 substrates using fast temperature ramping Hg-vapor annealing", APPL. PHYS. LETT., vol. 68, no. 18, 29 April 1996 (1996-04-29), pages 2565 - 2567, XP000588296
YU ET AL.: "HgBa2CaCu2Oy superconducting thin films prepared by laser ablation", PHYSICA C, vol. 289, 1997, pages 199 - 202, XP004102828
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