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

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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
Pages (from-to)1954-1960
Number of pages7
JournalChemistry of Materials
Volume12
Issue number7
DOIs
Publication statusPublished - 2000

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Cadmium
Transparency
Solid solutions
Thermoelectric power
Carrier concentration
Cations
Positive ions
Temperature
Air
Chemical analysis
spinell

ASJC Scopus subject areas

  • Materials Science(all)
  • Materials Chemistry

Cite this

Phase relationships, transparency, and conductivity in the cadmium indate-cadmium stannate system. / Kammler, D. R.; Mason, Thomas O; Poeppelmeier, Kenneth R.

In: Chemistry of Materials, Vol. 12, No. 7, 2000, p. 1954-1960.

Research output: Contribution to journalArticle

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AB - 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.

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