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


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
Issue number13
StatePublished - Oct 27 2002
Externally publishedYes


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

ASJC Scopus subject areas

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


Dive into the research topics of 'Synthesis, structure and dielectric characterization of Ln<sub>2</sub>Ti<sub>2-2x</sub>M<sub>2x</sub>O<sub>7</sub>(Ln = Gd, Er; M = Zr, Sn, Si)'. Together they form a unique fingerprint.

Cite this