Artículos de revistas
Enhanced Grain Growth In Yba2(cu1-xmnx)3o7-δ Compounds
Registro en:
Physica C: Superconductivity And Its Applications. , v. 159, n. 3, p. 306 - 312, 1989.
9214534
10.1016/0921-4534(89)90385-7
2-s2.0-0024682316
Autor
Jardim R.F.
Gama S.
Institución
Resumen
We have replaced Cu by Mn in the high-Tc superconductor YBa2Cu3O7-δ. Samples of the YBa2(Cu1-xMnx)3 O7-δ compounds were prepared by liquid-phase sintering for x=0.0, 0.025, 0.05, 0.075, 0.10, 0.15 and 0.20. Electrical resistivity and magnetic susceptibility measurements showed no significant changes in the critical temperature as function of the concentration of Mn. X-ray diffraction analysis demonstrates the existence of additional semiconducting phases, but the basic orthorhombic structure is preserved for all samples. The amounts of semiconducting extra phases increase with x and are the orthorhombic Y2BaCuO5 and the tetragonal Ba2Mn3O8. This result is also consistent with the observed reduction in the diamagnetic signal with the increase of the Mn content. Microstructural analysis reveals more densely packed plate-shaped grains, larger than the ones produced by the solid diffusion method. At the sample with 2.5 at% Mn substitution a maximum grain size enhancement is observed. © 1989. 159 3 306 312 Bednorz, Müller, (1986) Z. Phys., 64 B, p. 189 Wu, Ashburn, Torng, Hor, Meng, Gao, Huang, Chu, (1987) Phys. Rev. Lett., 58, p. 908 Yan, Rhodes, Gallagher, (1988) J. Appl. Phys., 63, p. 821 Yan, (1981) Mater. Sci. Eng., 48, p. 53 Yan, (1982) Advances in Powder Technology, p. 29. , G.Y. Chin, American Society for Metals, Metals Park, OH Jin, Tiefel, Sherwood, van Dover, Davis, Kammlott, Fastnacht, Keith, (1988) Appl. Phys. Lett., 52, p. 2074 Ekin, Panson, Braginski, Janocko, Hong, Kwo, Liu, Flandermeyer, (1987) Proc. of the Symp. on High Temperature Superconductors, 11 EA, p. 223. , D.U. Gubser, M. Schluter, Materials Research Society, Pittsburg Jardim, Gama, de Lima, Torriani, (1988) Phys. Rev. B, 38, p. 4580 Jardim, Gama, de Lima, Zacarelli, (1988) Solid State Commun., 68, p. 835 Jardim, Gama, de Lima, Torriani, Applied Superconductivity Conference (1989) IEEE. Trans. on Magn. MAG-25, , San Francisco-CA, August 1988, to be published in Jardim, Gama, de Lima, Torriani, (1988) Progress in High Temperature Superconductivity, 9, p. 283. , World Scientific Publishing, Singapore Jardim, Gama, de Lima, Torriani, Paduan-Filho, Zacarelli, Becerra, (1988) Progress in High Temperature Superconductivity, 9, p. 466. , World Scientific Publishing, Singapore Cava, Batlogg, van Dover, Murphy, Sunshine, Siegrist, Rameika, Espinosa, (1987) Phys. Rev. Lett., 58, p. 1676 Hazen, Finger, Angel, Prewitt, Ross, Mao, Hadidiacos, Chu, (1987) Phys. Rev., 35 B, p. 7238 Tarascon, Barboux, Micelli, Greene, Hull, Eibschutz, Sunshine, (1988) Phys. Rev. B, 37, p. 7458 Siegrist, Schneemeyer, Waszczak, Singh, Opila, Batlogg, Rupp, Murphy, (1987) Phys. Rev. B, 36, p. 8365 Zhou, Raudsepp, Pankurst, Morrish, Luo, Maartense, (1987) Phys. Rev. B, 36, p. 7230 Baggio-Saitovich, Azevedo, Scorzelli, Saitovich, da Cunha, Guimarães, Silva, Takeuchi, ^{57}Fe Mössbauer study of the superconductor YBa_{2}(Fe_{x}Cu_{1-x})_{3}O_{y} (1988) Physical Review B, 37 B, p. 7967 Maeno, Nojima, Aoki, Kato, Hoshino, Minami, Fujita, Specific Heat of a New Dense-Kondo Compound CePdIn (1987) Japanese Journal of Applied Physics, 26, p. L744 Strobel, Paulsen, Tholence, Superconducting properties of substituted YBa2Cu3(1−x)M3xO7−δ (1988) Solid State Communications, 65, p. 973 Xiao, Cieplak, Gravin, Streitz, Bakhsay, Chien, (1988) Phys. Rev. Lett., 60, p. 1446 R.F. Jardim and S. Gama, (1988) private communicationJardim, Machado, Gama, Bento, (1989) Phys. Rev. B, , submitted Yan, Cannon, Bowen, (1977) Ceramics Microstructures, 76, p. 276. , R.M. Fulrath, J.A. Pask, Westview, Boulder, CO