Phase relationships, transparency, and conductivity in the cadmium indate-cadmium stannate system

D. R. Kammler, Thomas O Mason*, Kenneth Poeppelmeier

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

A novel transparent conducting spinel solid solution Cd(1+x)In(2-2x)Sn(x)O4 (0 ≤ x ≤ 0.75 at 1175 °C) between cubic CdIn2O4 and orthorhombic Cd2SnO4 has been discovered. The extent of this solid solution is noteworthy given that bulk phase relations determined in air over the temperature range 800-1175 °C demonstrate that cubic (spinel) Cd2SnO4 is metastable. Reduced samples exhibit exceptional four-point dc conductivities exceeding 3500 S/cm (x = 0.70). The maximum optical gap estimated from diffuse reflectance spectra is ~3.0 eV for 0 ≤ x ≤ 0.15. The optical gap shows negligible change with reduction, possibly because of combined Moss-Burstein and band-narrowing effects. Abrupt conductivity increases and optical gap decreases at specific compositions, i.e., x = 0.4 and 0.2 respectively, may be indicative of a change in cation distribution between tetrahedral and octahedral sites. Room temperature thermopower measurements indicate the change in conductivity across the solution is a consequence of an increase in carrier density and that mobility remains relatively constant.

Original languageEnglish (US)
Pages (from-to)1954-1960
Number of pages7
JournalChemistry of Materials
Volume12
Issue number7
DOIs
StatePublished - Jan 1 2000

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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