Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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A Study of the Synthesis and the Properties on Microwave Dielectric Material of BaO-Pr$_2$O$_3$-TiO$_2$ and BaO-(Nd,Pr)$_2$O$_3$-TiO$_2$ System

BaO-Pr$_2$O$_3$-TiO$_2$계 및 BaO-(Nd,Pr)$_2$O$_3$-TiO$_2$계 마이크로파 유전체의 합성 및 특성에 관한 연구

  • 이용석 (명지대학교 무기재료공학과) ;
  • 이재원 (명지대학교 무기재료공학과) ;
  • 성학제 (한국자원연구소) ;
  • 김준수 (주) 동서 세라믹사업부 부설연구소) ;
  • 이병하 (명지대학교 무기재료공학과)
  • Published : 1998.08.01
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Abstract

This experiment is third study concerning BaO-{{{{ { { Pr}_{ 2} O}_{3 } }}-{{{{ { TiO}_{2 } }} (Ln=Sm, Nd, Pr, La..) system which is known to show a high dielectric constant and Q value in microwave dielectric materials. The process of cry-stallization and the microwave dielectric properties of the specimens sintered at 1220-140$0^{\circ}C$ for 2 hr was investigated in the BaO-(Na,{{{{ { { Pr})_{2 }O }_{3 } }}-{{{{ { TiO}_{2 } }} as well as BaO-{{{{ { { Pr}_{ 2} O}_{3 } }}-{{{{ { TiO}_{2 } }} system. The single phase BaPr2Ti5O14 and Ba(Nd,{{{{ { { Pr})_{2 }O }_{3 } }}Ti5O14 was finally formed from the Pr2Ti2O7 (Nd, Pr)2Ti2O7 as a secondary phase in the BaO-{{{{ { { Pr}_{ 2} O}_{3 } }}-{{{{ { TiO}_{2 } }} and BaO-(Nd, {{{{ { { Pr})_{2 }O }_{3 } }}-{{{{ { TiO}_{2 } }} system respectively The dielectric constant of the specimens sint-ered at 1280~131$0^{\circ}C$ showed the maximum value as 105(BaO-{{{{ { { Pr}_{ 2} O}_{3 } }}-{{{{ { TiO}_{2 } }} system) and 88 (BaO-(Nd,{{{{ { { Pr})_{2 }O }_{3 } }}-{{{{ { TiO}_{2 } }} system) and the Q values of them showed higher value than 1800 which are due to the maximum den-sity. However the dielectric properties of the specimens sintered at higher temperature than 131$0^{\circ}C$ were reduced due to the increases of pore which were resulted from the sudden grain growth.

Keywords

References

  1. J. Am. Ceram. Soc. v.66 no.6 $Ba(Zn_{\frac{1}{3}}Ta_{\frac{2}{3}})O_3$ Ceramics with Low Dielectric Loss at the Microwave Frequency S. Kawashima;M. Nishida;I. Ueda;H. Ouchi
  2. Jpn. J. Appl. Phys. v.22 no.7 Effect of Mndoping on the Dielectric Properties of $Ba_2Ti_9O_{20}$ Ceramics at Microwave Frequency S. Nomura;K. Toyama;K. Kaneda
  3. J. Am. Ceram. Soc. v.74 no.8 Microwave Dielectric Properties of Doped $BaTi_4O_9$ S. G. Mhaisakar;D. W. Readey;S. A. Akbar
  4. Ceram. Int. v.13 Preparation of Nd-doped $Ba_2Ti_9O_{20}$Ceramics for use in Microwave Applications T. Jaakola;J. Mottoonen;A. Uusimaki;R. Rautioaho;S. Leppavuori
  5. J. Solid State Chem. v.38 Synthesis and Crystal Chemistry of $BaNd_2Ti_3O_{10},\;BaNd_2Ti_5O_{14}$ D. Kolar;S. Gaberscek;B. Volavsek
  6. J. Am. Ceram. Soc. v.67 no.4 Microwave Characteristics of (Zn,Sn)TiO₂and BaO-PbO-Nd₂O₃Dielectric Resonators K. Wakino;K. Minai;H. Tamura
  7. Am. Ceram. Soc. Bull. v.66 no.9 Microwave Dielectric Properties of (Ba,Sr)O-Sm₂O₃-TiO₂ Ceramics S. Nishigaki;H. Kato;S. Yano;R. Kamimura
  8. Jpn. J. Appl. Phys. v.30 no.9B The Effect of Mn Addition on Dielectric Properties and Microstructure of BaO-Nd₂O₃-TiO₂Ceramics A. Yamada;Y. Utsumi;H. Watari
  9. J. Am. Ceram. Soc. v.74 no.8 Occurence of Dielectric 1:1:4 Compound in the Ternary System BaO-Ln₂O₃TiO₂(Ln=La, Nd, Sm): II. Reexamination of Formation of Isostructural Ternary Compounds in Identical Systems J. Takahashi;T. Ikegami
  10. Ceramic Society of Japan, Abstract of Fall Symposium O. Seita
  11. Jpn. J. Appl. Phys. v.31 no.9B H. Ohsato;S. Nishigaki;T. Okuda
  12. 전기전자재료학회지 v.10 no.3 BaO-Sm₂O₃-TiO₂계 마이크로파 유전체의 합성 및 그 특성에 관한 연구 이용석;김준수;이병하
  13. 전기전자재료학회지 v.10 no.9 BaO-Nd₂O₃-TiO₂계 및 BaO(Sm,Nd)₂O₃-TiO₂계 마이크로파 유전체의 합성 및 그 특성에 관한 연구 이용석;김준수;이병하
  14. IRE Trans on Microwave Theory Tech v.MTT-8 A Dielectric Resonator Method of Measuring Inductive Capacities in the Millimeter Range B.W. Hakki;P. D. Coleman
  15. Electronic Ceramics v.93 no.3 The Microwave Dielectric Properties of BaO-TiO₂-Rare Oxide System H. Kenichi
  16. IEEE. Tran. Microwave Theory Tech v.MTT-18 Analysis and Evaluation of a Method of Measuring the Complex Permittivity and Permeability W. E. Courtney
  17. Ceramic Engineering for Dielectronics O. Sho
  18. Electric Ceramics High Frequency Ceramic Cielectrics and Their Application for Microwave Components W. Wersing;B.C.H Steele(ed)
  19. The Principle of Engineering Materials C. R. Barrett;W. D. Nix;A. S. Teielman