Microwave dielectric properties and microstructures of CuO- and ZnO-doped LaAlO3 ceramics

Cheng Liang Huang, Ruei Jsung Lin, Hui Liang Chen

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18 Citations (Scopus)


The microwave dielectric properties and the microstructures of 0.25wt.% CuO-doped LaAlO3 ceramics with ZnO additions have been investigated. The sintered LaAlO3 ceramics are characterized by X-ray diffraction spectra and scanning electron microscopy (SEM). Tremendous reduction in sintering temperature can be achieved with the addition of sintering aids CuO and ZnO. The ceramic samples show that dielectric constants (εr) of 22-24 and Q × f values of 33,000-57,000 (at 9.7 GHz) can be obtained at low sintering temperatures 1340-1460°C. The temperature coefficient of resonant frequency varies from -24 to -48ppm/°C. At the level of 0.25wt.% CuO and 1wt.% ZnO additions, LaAlO3 ceramics possesses a dielectric constant (εr) of 23.4, a Q × f value of 57,000 (at 9.7GHz) and a τf value of -38ppm/°C at 1400°C for 2h.

Original languageEnglish
Pages (from-to)449-457
Number of pages9
JournalMaterials Research Bulletin
Issue number3
Publication statusPublished - 2002 Mar 1

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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