Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Addition of $B_2O_3$ precursors and their effect on texture and surface roughness of $La_2Zr_2O_7$ buffer layers

  • Published : 2008.05.31
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Abstract

[ $La_2Zr_2O_7$] (LZO) buffer layers were deposited on biaxially textured Ni-W substrates by chemical solution deposition method (CSD). In this study, the effect of $B_2O_3$ addition on texture and surface roughness of LZO films was investigated. The alkoxide-based precursor solution was employed to synthesize the precursor solution of LZO and the solution was coated on biaxially textured Ni-W substrates and subsequently annealed at $900^{\circ}C$ for crystallization. The pure LZO film without $B_2O_3$ addition showed a (222) reflection in the X-ray diffraction (XRD) profile. The intensity of (222) reflection was enhanced and more rough surface was obtained after further repetition of coating. Contrary to this, the LZO film prepared by $B_2O_3$ added precursor solution shows well-developed (400) reflection peak in the XRD profile and excellent biaxial texture (${\Delta}{\theta}=4.3^{\circ}$, ${\Delta}{\phi}=6.8^{\circ}$). The surface roughness of LZO films were also improved by addition of $B_2O_3$ even after multicoating ($R_{rms}{\sim}3.1nm$). It was shown that the LZO film with smooth surface and biaxial texture was grown on the biaxially textured Ni-W substrates with addition of $B_2O_3$ in the precursor solution.

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References

  1. M. Parans Paranthaman, S. Sathyamurthy, L. Heatherly, P.M. Martin, A. Goyal, T. Kodenkandath, X. Li, C.L.H. Thieme, M.W. Rupich, "All MOD buffer/YBCO approach to coated conductors," Physica C., vol. 445-448, pp. 529-32, Oct. 2006 https://doi.org/10.1016/j.physc.2006.06.006
  2. M.S. Bhuiyan, M. Paranthaman, S. Kang, D.F. Lee, K. Salama, "Growth of epitaxial $Y_2O_3$ buffer layers on biaxially textured Ni-W substrates for YBCO coated conductors by MOD approach", Physica C., vol. 422, pp. 95-101, June 2005 https://doi.org/10.1016/j.physc.2005.03.016
  3. T. G. Chirayil, M. Paranthaman, D. B. Beach, D. F. Lee, A. Goyal, R. K. Williams, X. Cui, D. M. Kroeger, R. Feenstra, D. T. Verebelyi, D. K. Christen, "Epitaxial growth of $La_2Zr_2O_7$ thin films on rolled Ni-substrates by sol-gel process for high $T_c$ superconducting tapes," Physica C., vol. 336, pp. 63-69, July 2000 https://doi.org/10.1016/S0921-4534(00)00089-7
  4. K. Knoth, R. Huhne, S. Oswald, L. Molina, O. Eibl, L. Schultz, B. Holzapfel, "Growth of thick chemical solution derived pyrochlore $La_2Zr_2O_7$ buffer layers for $YBa_2Cu_3O_{7-x}$ coated conductors," Thin Solid Films, vol. 516, pp. 2099-2108, Feb. 2008 https://doi.org/10.1016/j.tsf.2007.08.130
  5. S. I. Jang, H. M. Jang, "Structure and electrical properties of boron-added (Ba,Sr)$TiO_3$ thin films fabricated by the sol-gel method," Thin Solid Films, vol. 330, pp. 89-95, 1998 https://doi.org/10.1016/S0040-6090(98)00560-4
  6. C.E. Murray, K.P. Rodbell and P.M. Vereecken, "Underlayer effects on texture evolution in copper films" Thin Solid Films, vol. 503, pp. 207-211, May 2006 https://doi.org/10.1016/j.tsf.2005.11.105
  7. J.J. Shyu and M.T. Jiang, "Sintering and phase transformation in $B_2O_3/P_2O_5$-doped $Li_2O^.Al_2O_3\/^.4SiO_2$ glass-ceramics" Journal of the American Ceramic Society, vol. 83, pp. 635-639, 2000 https://doi.org/10.1111/j.1151-2916.2000.tb01244.x
  8. C.F. Yang and M.T.Chang, "The influence of $B_2O_3$ on the sintering of $MgO-CaO-Al_2O_3-SiO_2$ composite glass powder" Ceramics International, vol. 25, pp. 383-7, 1999 https://doi.org/10.1016/S0272-8842(98)00049-2