Glass-free LTCC microwave dielectric ceramics

Jian Jiang Bian, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)


The sintering behavior, microstructure and microwave dielectric properties of complex pyrophosphate compounds AMP2O7 (A = Ca, Sr; M = Zn, Cu) were investigated in this paper. All compounds could be densified below the temperature of 950 °C without any glass addition, and exhibit low permittivity (εr < 8), high Q × f value and negative temperature coefficient of resonant frequency. The Q × f value was discussed from the point of view of bond strength. The chemical compatibility with silver and copper was also investigated. All compounds seriously react with silver at ∼700 °C. However SrZnP2O7 could be co-fired with copper in reduced atmosphere. The microwave dielectric properties of SrZnP2O7 sintered at 950 °C in reducing atmosphere are: εr = 7.06, Q × f = 52781 GHz, τf = -70 ppm/°C. In terms of its lower sintering temperature, chemical compatibility with copper and good microwave dielectric properties, SrZnP2O 7 ceramic is very promising for low temperature co-fired ceramic (LTCC) applications.

Original languageEnglish
Pages (from-to)2120-2129
Number of pages10
JournalMaterials Research Bulletin
Issue number12
Publication statusPublished - 2005 Dec 8
Externally publishedYes


  • A. Ceramics
  • D. Dielectric properties

ASJC Scopus subject areas

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


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