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Morphological analyses of Hg1-xHoxBa2Ca2Cu3O8+y (0.0 ≤ x ≤ 0.20) superconductors fabricated by sol-gel technique

A. COŞKUN1,* , A. EKICIBIL2, H. ASLAN3, S. K. ÇETIN2, C. SARIKÜRKCÜ4, K. KIYMAÇ2

Affiliation

  1. Department of Physics, Faculty of Sciences and Letters, Mugla University, 48000, Mugla, Turkey
  2. Department of Physics, Faculty of Sciences and Letters, Cukurova University, 01330 Adana, Turkey
  3. Department of Physics, Faculty of Engineering and Natural Sciences, 34956, Istanbul, Turkey
  4. Department of Chemistry, Faculty of Sciences and Letters, Mugla University, 48000, Mugla,Turkey

Abstract

This work reports a systematic study on the morphological properties of the superconducting compounds, Hg1-xHoxBa2Ca2Cu3O8+y with 0.0 ≤ x ≤ 0.20, prepared by using the so-called sol-gel method fallowed by a sealed quartz tube synthesis. The analyses of the synthesized products were performed by XRD, AFM, SEM and EDX methods. The results, obtained from the analyses of the XRD and EDX spectra or patterns, and the SEM and AFM images, indicate that the high-Tc Hg-(1223) and Hg-(1234) phases gradually disappear with increasing amounts of Ho. In addition it is observed that, Hg is excluded from the structure with the addition of Ho for Hg. As a result, it has been concluded that the high-Tc phases, Hg-(1223) and Hg-(1234), gradually disappear with increasing amount of Ho content, due to the exclusion of excess amount of Hg from the structures of the samples. This exclusion and observation may be attributed either to the quite different sizes of Ho and Hg ions or to the large HgO powders compared to the sol-gel powders and/or even to the sample preparation method used in this work.

Keywords

Atomic force microscopy, Characterization, X-ray diffraction, Oxide superconducting materials.

Citation

A. COŞKUN, A. EKICIBIL, H. ASLAN, S. K. ÇETIN, C. SARIKÜRKCÜ, K. KIYMAÇ, Morphological analyses of Hg1-xHoxBa2Ca2Cu3O8+y (0.0 ≤ x ≤ 0.20) superconductors fabricated by sol-gel technique, Optoelectronics and Advanced Materials - Rapid Communications, 4, 11, November 2010, pp.1756-1762 (2010).

Submitted at: April 12, 2010

Accepted at: Nov. 10, 2010