Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Microstructure and Microwave Dielectric Properties of Ceramics in the System CaTiO3-Li0.5Nd0.5TiO3

  • Lowe, Tristan (Materials Science Centre, University fo Manchester/UMIST Manchester) ;
  • Azough, Feridoon (Materials Science Centre, University of Manchester/UMIST Manchester) ;
  • Freer, Robert (Materials Science Centre, University of Manchester/UMIST Manchester)
  • Published : 2003.04.01
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Abstract

Ceramics of xCaTiO$_3$-(1-x)Li$_{0.5}$Nd$_{0.5}$TiO$_3$(xCT-(1-x)LNT) series have been prepared by the mixed oxide route. Powders were calcined at 110$0^{\circ}C$ ; cylindrical specimens were fired at temperatures in the range 1300-150$0^{\circ}C$. Sintered products were typically 90-95% dense. The microstructures were dominated by angular grains typically 1.3${\mu}{\textrm}{m}$ to 3.5 ${\mu}{\textrm}{m}$ in size. Twinning in the microstructures was analysed using Electron Back Scattered Diffraction (EBSD). Microwave dielectric properties of xCT-(1-x)LNT at 2.1 GHz ($\varepsilon$$_{r}$, Qxf, and $\tau$r) were 170,3800 GHz and 744 ppm/$^{\circ}C$ for pure CaTiO$_3$ and 80,2000 GHz and -240 ppm/$^{\circ}C$ for LNT. The $\tau$r decreases almost linearly from 744 for pure CaTiO$_3$ to -240 for pure LNT.LNT.T.

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