Synthesis, structure and dielectric characterization of Ln2Ti2-2xM2xO7(Ln = Gd, Er; M = Zr, Sn, Si)

Erin E. Erickson, Danielle Gray, Kathryn Taylor, Robin T. Macaluso, Lee Ann LeTard, G. S. Lee, Julia Y. Chan

Research output: Contribution to journalArticlepeer-review

Abstract

The progress in wireless communications and information access has demanded the use of electronic ceramics exhibiting desired properties. To further our understanding of these properties, compounds in the Ln2Ti2-2xM2xO7 (Ln = Gd, Er; M = Zr, Sn, Si) systems were synthesized by ceramic methods and characterized by powder X-ray diffraction. The ZrO2-doped Gd2Ti2-2xZr2xO7 compounds adopt the pyrochlore structure type and form a complete solid solution. Er2Ti2-2xZr2xO7 forms a pyrochlore solid solution for x < 0.1. However, stoichiometric Er2Zr2O7 does not form; instead Er4Zr3O12 forms a with defect fluorite structure. The Sn-doped Ln2Ti2-2xSn2xO7 (Ln = Gd, Er) compounds form complete solid solutions, and the Si compounds adopt the pyrochlore structure up to x = 0.05. At ambient temperature, dielectric constants range from 10 to 61 for Er2Ti2-2xZr2xO7 and 16-31 for Gd2Ti2-2xZr2xO7 with low dielectric loss (1 × 10-3) at 1 GHz.

Original languageEnglish (US)
Pages (from-to)2077-2083
Number of pages7
JournalMaterials Research Bulletin
Volume37
Issue number13
DOIs
StatePublished - Oct 27 2002
Externally publishedYes

Keywords

  • A. Ceramics
  • A. Oxides
  • D. Dielectric properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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