Studies on the Superconductivity in the System (Li1-xMx)Ti2O4 (M=Mg, Be) with the Spinel Structure

Kenji Kawaguchi, Etsuo Akiba, Shigemitsu Shin, Naruaki Tojima

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Abstract

The system (Li1-xMx)Ti2O4 (M=Mg, Be) with the spinel structure was prepared by firing twice a mixture of the component oxides, i.e., Li2O, MgO, BeO, Ti2O3, and TiO2 at 1073K for 12 h in vacuo(ca. 10-5 Torr). The lattice constants were obtained by the powder X-ray diffractometry whereas the molar fraction of Ti3+ ions in the total Ti atoms, i.e., f (%) was determined by thermogravimetry. The critical temperatute Tc(K, mid-point) was obtained by using a usual four-probe resistivity measurement in the range of 300 K to ca. 2 K. As a result, the cubic lattice constant a(A) of the system linearly increased as the molar ratio f increased. However, it was found that Be2+ with a much smaller ionic radius than that of Li+ can hardly replace the Li+ site of the spinel structure, as implied from the plots of the lattice parameter a and the chemical composition x. The highest Tc was observed at f=ca. 50 % in the composition Li1+xTi2-xO4, and the Tc suddenly decreased as either the molar ratio f or the lattice constant a decreased. On the other hand, the Tc of the composition (Li1-xMgx)Ti2O4 gradually decreased as either the molar ratio f or lattice constant a increased.

Original languageEnglish
Pages (from-to)551-554
Number of pages4
JournalJournal of the Japan Society of Powder and Powder Metallurgy
Volume36
Issue number5
DOIs
Publication statusPublished - 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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