La2O3-CuO-TiO2 Phase Diagram and the Crystal Structure of [La0.860.14Cu3](Ti3.42Al0.58)O12

Mark T. Anderson, Vincent E. Balbarin, Dawn A. Groenke, Gordon A. Bain, Kenneth R Poeppelmeier

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Abstract

The La2O3-CuO-TiO2 system in air at 960°C contains two perovskite-related ternary compounds, La2CuTiO6 and [La2/32/3Cu3](Ti4)O12. The former is orthorhombic, has cell parameters a = 5.587(6), b = 5.616(5), c = 7.842(7) Å, is isostructural with GdFeO3, and exhibits Curie-Weiss magnetic behavior. The copper and titanium are statistically distributed over one crystallographic site. The La2O3-CuO-TiO2 and La2O3-CuO-SnO2 systems differ in their phase relationships, number of ternary phases, and crystal chemistry of their La2CuMO6 (M = Ti, Sn) compounds. Single crystals of [La0.860.14Cu3](Ti3.42Al0.58)O12 were grown in an Al2O3 crucible from a CuO-TiO2 flux and crystallize in the cubic space group /m3̄ with a = 7.421(1) Å and Z = 2. The compound is isostructural with [CaMn3](Mn4)O12. The excess lanthanum in the crystal compensates the charge deficiency brought about by the aluminum incorporation, and the electrostatic stabilization it affords is the principal driving force for the observed structure.

Original languageEnglish
Pages (from-to)216-227
Number of pages12
JournalJournal of Solid State Chemistry
Volume103
Issue number1
DOIs
Publication statusPublished - Mar 1993

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Crystal chemistry
Lanthanum
Crucibles
Titanium
Aluminum
Perovskite
Phase diagrams
Copper
Electrostatics
Stabilization
Crystal structure
phase diagrams
Single crystals
Fluxes
Crystals
crystal structure
crucibles
Air
lanthanum
crystals

ASJC Scopus subject areas

  • Materials Chemistry
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

La2O3-CuO-TiO2 Phase Diagram and the Crystal Structure of [La0.860.14Cu3](Ti3.42Al0.58)O12. / Anderson, Mark T.; Balbarin, Vincent E.; Groenke, Dawn A.; Bain, Gordon A.; Poeppelmeier, Kenneth R.

In: Journal of Solid State Chemistry, Vol. 103, No. 1, 03.1993, p. 216-227.

Research output: Contribution to journalArticle

Anderson, Mark T. ; Balbarin, Vincent E. ; Groenke, Dawn A. ; Bain, Gordon A. ; Poeppelmeier, Kenneth R. / La2O3-CuO-TiO2 Phase Diagram and the Crystal Structure of [La0.860.14Cu3](Ti3.42Al0.58)O12. In: Journal of Solid State Chemistry. 1993 ; Vol. 103, No. 1. pp. 216-227.
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abstract = "The La2O3-CuO-TiO2 system in air at 960°C contains two perovskite-related ternary compounds, La2CuTiO6 and [La2/3□2/3Cu3](Ti4)O12. The former is orthorhombic, has cell parameters a = 5.587(6), b = 5.616(5), c = 7.842(7) {\AA}, is isostructural with GdFeO3, and exhibits Curie-Weiss magnetic behavior. The copper and titanium are statistically distributed over one crystallographic site. The La2O3-CuO-TiO2 and La2O3-CuO-SnO2 systems differ in their phase relationships, number of ternary phases, and crystal chemistry of their La2CuMO6 (M = Ti, Sn) compounds. Single crystals of [La0.86□0.14Cu3](Ti3.42Al0.58)O12 were grown in an Al2O3 crucible from a CuO-TiO2 flux and crystallize in the cubic space group /m3̄ with a = 7.421(1) {\AA} and Z = 2. The compound is isostructural with [CaMn3](Mn4)O12. The excess lanthanum in the crystal compensates the charge deficiency brought about by the aluminum incorporation, and the electrostatic stabilization it affords is the principal driving force for the observed structure.",
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AB - The La2O3-CuO-TiO2 system in air at 960°C contains two perovskite-related ternary compounds, La2CuTiO6 and [La2/3□2/3Cu3](Ti4)O12. The former is orthorhombic, has cell parameters a = 5.587(6), b = 5.616(5), c = 7.842(7) Å, is isostructural with GdFeO3, and exhibits Curie-Weiss magnetic behavior. The copper and titanium are statistically distributed over one crystallographic site. The La2O3-CuO-TiO2 and La2O3-CuO-SnO2 systems differ in their phase relationships, number of ternary phases, and crystal chemistry of their La2CuMO6 (M = Ti, Sn) compounds. Single crystals of [La0.86□0.14Cu3](Ti3.42Al0.58)O12 were grown in an Al2O3 crucible from a CuO-TiO2 flux and crystallize in the cubic space group /m3̄ with a = 7.421(1) Å and Z = 2. The compound is isostructural with [CaMn3](Mn4)O12. The excess lanthanum in the crystal compensates the charge deficiency brought about by the aluminum incorporation, and the electrostatic stabilization it affords is the principal driving force for the observed structure.

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