SOLID-SOLUTION FORMATION, ELECTRICAL-PROPERTIES AND ZERO-RESISTANCE BEHAVIOR IN THE SPINEL SYSTEM MG2TIO4-MGTI2O4

TJ COGLE, CAS MATEUS, JH BINKS, JTS IRVINE, John Thomas Sirr Irvine

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

A range of solid solutions in the system Mg2-yTi1+yO4 with average Ti valence x, x = (4 + 2y)/(1 + y), have been prepared for 3.2 <x <4.0. The lattice parameter varied smoothly with composition, increasing from a value of 8.443 angstrom for x = 4.0 to 8.484 angstrom for x = 3.2. Room-temperature resistance was found to be a minimum for compositions between x = 3.25 and 3.3. On cooling from room temperature to 100 K, resistivity rose by several orders of magnitude for compositions with x > 3.3. For compositions with x <3.25, the temperature dependence of resistivity was much less, with a rise of only one order of magnitude between 300 and 20 K. For compositions between x = 3.25 and 3.3, transitions from semiconducting to zero-resistance behaviour were observed at ca. 50 K. This zero-resistance behaviour was lost on standing, except when the sample was stored in vacuum.

Original languageEnglish
Pages (from-to)289-291
Number of pages3
JournalJournal of Materials Chemistry
Volume1
Issue number2
Publication statusPublished - Mar 1991

Keywords

  • SUPERCONDUCTIVITY
  • TITANATE
  • SPINEL

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