$Sr(Zr, Ti)O_3$ 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)
  • 발행 : 1997.06.01

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.

키워드

참고문헌

  1. MRS Int'l Mtg. on Adv Mat v.3 Preparation and Dielectric Properties at Microwave Frequencies of SrZrO₃by Multi-Preparation Method A. Yamada;A. Watanabe;H. Haneda;S. Shirasaki
  2. Jpn. J. Appl. Phys. v.31 Preparation of Sr(Zr,Ti)O₃Ceramics and Their Dielectric Properties at Microwave Frequencies A. Yamada;Y. Utsumi;H. Watrai;K. Sato
  3. Electronic Ceramics v.24 no.124 Processing and Dielectric Properties at Microwave Frepuencies of Sr-Zr-Ti-O System A. Yamada
  4. J. Kor. Ceram. Soc. v.27 no.6 The Preparation and Thermal Decomposition of the Basic Zirconium Sulfate S.I. Seok;H.K. Jung;M.H. Joo;D.S. Park
  5. Rigaku Journal v.6 no.1 Rietan, a Software Package for The Rietveld Analysis and Simulation of X-Ray and Neutron Diffraction Patterns F. Izumi
  6. J. Ceram. Soc. Jpn. v.103 no.8 Chemical States, Roles and Interrelations of Additives in BaTiO₃Ceramics F. Ren;S. Ishida
  7. IRE Trans. on Microwave Theory Tech. v.MTT-8 A Dielectric Resonator Method of Measuring Inductive Capacities in The Milimeter Range B.W. Hakki;P.D. Coleman
  8. Ferroelectrics v.27 Newly Developed Ternary (Ca,Sr,Ba) Zirconate Ceramics System for Microwave Resonators T. Yamaguchi;Y. Komatsu
  9. Acta Crystallogr v.B32 The Structure of Orthorhombic SrZrO₃by Neutron Powder Diffraction A. Ahtee;M. Ahtee;A.M. Glazer;A.W. Hewat
  10. J. Mat. Sci. Lett v.10 High-Temperature X-Ray Diffractometric Studies of CaZrO₃SrZrO₃and BaZrO₃ M. D. Mathew;E.B. Mirza;A. C. Momin
  11. Phys. Chem. Minerals. v.18 Thermal Expansion of SrZrO₃Perovskites Y. Zhao;D.J. Weider
  12. J. Solid State Chem. v.101 On The Structure off SrZrO₃ J.A.M. Roosemalem;P. Vlaanderen;E.H.P. Cordfunke
  13. International Tables for X-Ray Crystallogragphy v.A
  14. Mat. Res. Bull. v.21 The Changes in Oxidation State of Mn Ions in Semiconducting BaTiO₃and SrTiO₃around The Phase Transition Temperatures T.R.N. Kutty;L.D. Devi;P. Murgaraj
  15. Solid State Comm. v.61 no.1 Electron Paramagnetic Resonance of $Mn^{4+}$ in BaTiO₃ K.A. Muller;W. Berlinger;K.W. Blazy
  16. Phys. Rev. Lett v.2 no.8 Electron Paramagnetic Resonance of Mn (Ⅳ) in SrTiO₃ K.A. Muller
  17. Phys. Rev. v.B16 no.11 Electron Paramagnetic Resonance of Three Manganese Centers in Reduced SrTiO₃ R.A. Serway;W. Berlinger;K.A. Muller
  18. J. Appl. Phys. v.45 no.9 Electron States of Mn Ions in$Ba_{0.97}Si_{0.03}TiO_3$Single Crystals M. Nakahara;T. Murakami
  19. Proc. Phys. Soc. v.92 Paramagnetic Resonance Spectrum of Manganese in Calcium Zirconate B. Henderson
  20. Ferroelectrics v.37 Effect of Oxiddation States of Mn on The Phase Stability of Mn-doped BaTiO₃ S.B. Desu;E.C. Subbarao