Effect of CuO additive on sintering and microwave dielectric behavior of LaAlO3 ceramics

Cheng Shing Hsu, Cheng Liang Huang

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38 Citations (Scopus)


The dielectric properties and the microstructures of LaAlO3 ceramics with CuO additions (0.25-1 wt%) have been investigated. The sintered LaAlO3 ceramics are characterized by X-ray diffraction spectra and scanning electron microscopy (SEM). The ceramic samples show that a dielectric constant (εr) of 19-22 and a Q × f value of 5000-48,000(at 9.7 GHz) can be obtained at low sintering temperatures of 1370-1460°C. The temperature coefficient of resonant frequency varies from -50 to -80 ppm/°C. At the level of 0.5 wt% and 1 wt% CuO additions, low Q × f value of the LaAlO3 ceramics is owing to the formation of the second phase LaAl11O18. With CuO addition, an 100-200°C reduction in sintering temperature can be achieved for the LaAlO3 ceramics.

Original languageEnglish
Pages (from-to)1939-1947
Number of pages9
JournalMaterials Research Bulletin
Issue number11
Publication statusPublished - 2001 Sep 15

All Science Journal Classification (ASJC) codes

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

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