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$Sr(Zr, Ti)O_3$ 마이크로파 유전체에 첨가된 $Mn_2O_3, Y_2O_3$ 의 영향과 Mn의 산화상태
Effects of $Mn_2O_3, Y_2O_3$ Additives and Valence State of Mn ion in $Sr(Zr, Ti)O_3$ Microwave Dielectrics

정하균    (한국화학연구소 기초연구실   ); 박도순    (한국화학연구소 기초연구실   ); 박윤창    (성균관대학교 화학과  );
  • 초록

    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.


  • 주제어

    Microwave dielectrics .   Strontium zirconate .   EPR .   Mn valency .   Rietveld method.  

  • 참고문헌 (20)

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    5. 2001 "$Mg_2$$SnO_4$:Mn 녹색 형광체의 저전압 음극선 발광 특성" 한국재료학회지 = Korean journal of materials research 11 (9): 759~762    
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