Properties of Y2Ti2O7 based microwave dielectric ceramics doped with lead titanate

Jiayu Ding, Yuan Xiao, Qitu Zhang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A new kind of Y2Ti2O7 microwave dielectric ceramics with middle dielectric constant was studied with an addition of lead titanate. The properties were characterized and measured by X-ray diffraction, scanning electron microscopy, network analyzer and impedance analyzer. The phase composition and dielectric properties of ceramics doped with PbTiO3 were investigated. The results showed that the main phase of PbTiO3 doped ceramics did not change and still exhibited a kind of pyrochlore structure. It could be speculated that PbTiO3 came into the Y2Ti2O7 crystal lattice. Pb2+ was incorporated into Y3+ site on the A site of pyrochlore structure, which also lead to the formation of a new kind of vacancy defects. The lattice diffusion rates increased due to the breaking of order in the structure, so the sintering temperature was effectively decreased. As a small amount of Pb elements was added, the lattice constant increased, the volume of unit cell became larger, the Ti4+ ions had more space to move, the total polarization of the materials increased, thereby the dielectric properties were enhanced, in particular, the value of dielectric constant slightly increased. When the amount of lead titanate was 2%, Y2Ti2O7 ceramics sintered at 1345°C, exhibited better dielectrical properties: εr=56.4, tan δ=1.21×10-3, Q×f=4776 GHz.

Original languageEnglish
Pages (from-to)875-879
Number of pages5
JournalXiyou Jinshu/Chinese Journal of Rare Metals
Volume34
Issue number6
DOIs
StatePublished - Nov 2010

Keywords

  • Doping
  • Lead titanate
  • Microwave dielectric ceramics
  • Pyrochlore structure

Fingerprint

Dive into the research topics of 'Properties of Y2Ti2O7 based microwave dielectric ceramics doped with lead titanate'. Together they form a unique fingerprint.

Cite this