Journal of Sol-Gel Science and Technology

, Volume 6, Issue 1, pp 7–55

Invited review “sol-gel” preparation of high temperature superconducting oxides

  • Masato Kakihana
Article

DOI: 10.1007/BF00402588

Cite this article as:
Kakihana, M. Journal of Sol-Gel Science and Technology (1996) 6: 7. doi:10.1007/BF00402588

Abstract

This review article focuses on the sol-gel preparation of high temperature superconducting oxides wherein different classes of gel technologies were utilized. These involve: 1) the sol-gel route based upon hydrolysis-condensation of metal-alkoxides, 2) the gelation route based upon concentration of aqueous solutions involving metal-chelates, often called as “chelate gel” or “amorphous chelate” route, and 3) the organic polymeric gel route. This paper reviews the current status of these sol-gel processes, and illustrates the underlying chemistry involved in each sol-gel technology. It is demonstrated that the chemical homogeneity of the gel is often disturbed by the differences in the chemistries of the cations. Prior to gelation the starting precursor solution containing various forms of metal-complexes must be chemically modified to overcome this problem. Illustration of a variety of strategies for success in obtaining a homogeneous multicomponent gel with no precipitation is focal point of this review article.

Keywords

sol-gel methodhigh temperature superconducting oxidesmulticomponent gelchemical homogeneitymetal alkoxidesamorphous chelate gelorganic polymeric gelpolymerized complex method

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Masato Kakihana
    • 1
  1. 1.Research Laboratory of Engineering MaterialsTokyo Institute of TechnologyYokohamaJapan