Low-temperature sintering of temperature-stable LaNbO4 microwave dielectric ceramics

Hang Won Lee, Jeong Hyun Park, Sahn Nahm, Dong Wan Kim, Jae Gwan Park

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


We demonstrate the correlation between sintering behavior and microstructural observations in low-temperature sintered, LaNbO4 microwave ceramics. Small CuO additions to LaNbO4 significantly lowered the sintering temperature from 1250 to 950 °C. To elucidate the sintering mechanism, the internal microstructure of the sample manipulated by a focused ion beam (FIB) was investigated using transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS). LaNbO4 with 3 wt% CuO sintered at 950 °C for 2 h possessed the following excellent microwave dielectric properties: a quality factor (Qxf) of 49,000 GHz, relative dielectric constant (εr) of 19.5, and temperature coefficient of resonant frequency (τf) of 1 ppm/°C. The ferroelastic phase transformation was also investigated using in situ X-ray diffraction (XRD) to explain the variation of τf in low-temperature sintered LaNbO4 as a function of CuO content.

Original languageEnglish
Pages (from-to)21-24
Number of pages4
JournalMaterials Research Bulletin
Issue number1
Publication statusPublished - 2010 Jan


  • A. Ceramics
  • A. Oxides
  • C. Electron microscopy
  • D. Dielectric properties
  • D. Microstructure

ASJC Scopus subject areas

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


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