Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of $Mn_2O_3, Y_2O_3$ Additives and Valence State of Mn ion in $Sr(Zr, Ti)O_3$ Microwave Dielectrics

$Sr(Zr, Ti)O_3$ 마이크로파 유전체에 첨가된 $Mn_2O_3, Y_2O_3$ 의 영향과 Mn의 산화상태

  • 정하균 (한국화학연구소 기초연구실) ;
  • 박도순 (한국화학연구소 기초연구실) ;
  • 박윤창 (성균관대학교 화학과)
  • Published : 1997.06.01
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Abstract

The effects of Mn2O3 and Y2O3 additives on the microstructure and dielectric properties of Sr(Zr, Ti)O3 have been investigated. Powders with Sr(Zr1-xTix)O3(0$\leq$x$\leq$0.1) composition were prepared by the conventional solid state processing from commercial TiO2 and precipitation-processed ZrO2. The powders containing sintering additives of Mn2O3 and Y2O3 were compacted and then sintered at 1,55$0^{\circ}C$ for 4 h to get>97% relative density. Mn2O3 suppressed the grain growth and Y2O3 enhanced the density of sintered body. The oxidation state of Mn ions were determined by a chemical wet method and EPR spectroscopy. Mn ions were present as Mn2+ and Mn4+ in SrZrO3, while as Mn3+ and Mn4+ in Ti-substituted Sr(Zr, Ti)O3. With the substitution of Ti, the lattice parameters of SrZrO3 decreased and its dielectric constant increased with remarkable decrease in Q value. The dielectric constant of Sr(Zr, Ti)O3 was in the range of 30 to 40, Q values 1,200~5,400 at 6 GHz and temperature coefficient of resonant frequency -67~100 ppm/K.

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References

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