La(Mg 1/2 Ti 1/2 )O 3   세라믹스의 구조 및 고주파 유전 특성 연구

여재현; 백종후; 남산; 이확주; 박현민; 변재동; Jae-Hyun Yeo; Jong-Hu Baek; Sahn Nahm; Hwack-Joo Lee; Hyun-Min Park; Jae-dong Byun

Korean Journal of Materials Research, Vol.9, No.9, 943-947, September, 1999

Export Citation

La(Mg 1/2 Ti 1/2 )O 3 세라믹스의 구조 및 고주파 유전 특성 연구

Structural and Microwave Dielectric Properties of La(Mg 1/2 Ti 1/2 )O 3 Ceramics

여재현, 백종후, 남산 , 이확주¹, 박현민¹, 변재동

고려대학교 재료공학과
¹한국표준과학연구원 물질량표준부

Jae-Hyun Yeo, Jong-Hu Baek, Sahn Nahm , Hwack-Joo Lee¹, Hyun-Min Park¹, and Jae-dong Byun

Department of Materials Science and Engineering, Korea University, 1, 5-ka, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Korea
¹Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science, Taejon, 305-600 Korea

초록

La(Mg 1/2 Ti 1/2 )O 3 세라믹스의 구조 및 고주파 유전특성에 관한 연구를 하였다. La(Mg 1/2 Ti 1/2 )O 3 는 B site 양이온이 1:1 규칙화된 단사정 구조를 가지고 있었고 격자상수는 a=5.5467(3)\AA,b=5.5616(3)\AA,c=7.8426(5)\AA그리고β=89.9589(2) ? 로 밝혀졌고. P2 1 /n 의 공간군을 가지고 있었다. La(Mg 1/2 Ti 1/2 )O 3 내부에는 산소팔면체의 동상 및 역상 기울림이 존재하고 a^_a^_c^_ 기울림 구조를 가지고 있음을 알수 있었다. 또한 A site 양이온의 역 평행이동도 발견되었다. 1600 ? C 이상에서 소결된 시료는 모두 95% 이상의 상대이론 밀도를 가지고 있었고 유전상수는 대략 28 정도였다. 1630 ? C 에서 5시간 소결된 시료에서 최고높은 Q\timesf 0 값, 63,000을 얻었다. LMT의 공진주파수 온도 계수는 >?77ppm/ ? C ?79ppm/ ? C 였다.

The crystal structure and the microwave dielectric properties of La(Mg 1/2 Ti 1/2 )O 3 ceramics have been investigated. La(Mg 1/2 Ti 1/2 )O 3 has the 1:1 ordered monoclinic structure with the lattice parameters of a=5.5467(3)\AA,b=5.5616(3)\AA,c=7.8426(5)\AAandβ=89.9589(2) ? The spacegroup of LMT is P2 1 /n . Monoclinic LMT has the inphase and anti-phase tilting of octahedra with the a^_a^_c^_ tilting system. Anti-parallel shift of A-site cations was also found in LMT. The relative density of the specimens sintered above 1600 ? C was ranged between 95 % and 96 % of the theoretical density and the dielectric constant of specimens was about 28. The highest Q\timesf achieved in this investigation was 63,100 for the specimen sintered at 1630 ? C for 5 hr. Temperature coefficient of resonance frequency ranged from >?74ppm/ ? C ?79ppm/ ? C .

[References]

Wersing W, Steele BCH(ed.), Electronic Ceramics, Chap-4, 69 (1991)
Wakino K, Jpn. J. Appl. Phys, 30, 2347 (1991)
Cho SY, Seo MK, Hong KS, Park SJ, Kim IT, Mater. Res. Bull., 32(6), 725 (1997)
Paik JH, Choi CH, Nahm S, Lee HJ, Byun JD, J. Mater. Sci. Letts., 18, 663 (1999)
Youn HJ, Kim IT, Hong KS, Kim H, Ferroelectrics, 193, 167 (1997)
Yeo DH, Kim JB, Moon JH, Yoon SJ, Kim HJ, Jpn. J. Appl. Phys, 35, 663 (1996)
Akbas MA, Davies PK, J. Am. Ceram. Soc., 81(8), 2205 (1998)
Harshe G, Bhalla AS, Cross LE, Mater. Lett., 18, 173 (1994)
German M, Kovba LM, Russ. J. Inorg. Chem., 28, 586 (1983)
Groen WA, Van Berkel FPF, Ijdo DJW, Acta Cryst., C42, 1472 (1986)
Young RA, Sakthivel A, Moss TS, Paivasantos CO, Georgia Institute of Techonology (1995)
Hakki BW, Coleman PD, IRE Trans. Microwave Theory. Tech., 8, 402 (1960)
Reaney IM, Colla EL, Setter N, Jpn. J. Appl. Phys, 33, 3984 (1994)
Colla EL, Reaney IM, Setter N, J. Appl. Phys, 74, 3414 (1993)
Glazer AM, Acta Cryst., A31, 756 (1975)
Glazer AM, Acta Cryst., B28, 3384 (1972)
Shannon RD, Acta Cryst., A32, 751 (1976)
Woodward PM, Acta Cryst., B53, 44 (1997)

[Related Articles]

[1] Wersing W, Steele BCH(ed.), Electronic Ceramics, Chap-4, 69 (1991)

[2] Wakino K, Jpn. J. Appl. Phys, 30, 2347 (1991)

[3] Cho SY, Seo MK, Hong KS, Park SJ, Kim IT, Mater. Res. Bull., 32(6), 725 (1997)

[4] Paik JH, Choi CH, Nahm S, Lee HJ, Byun JD, J. Mater. Sci. Letts., 18, 663 (1999)

[5] Youn HJ, Kim IT, Hong KS, Kim H, Ferroelectrics, 193, 167 (1997)

[6] Yeo DH, Kim JB, Moon JH, Yoon SJ, Kim HJ, Jpn. J. Appl. Phys, 35, 663 (1996)

[7] Akbas MA, Davies PK, J. Am. Ceram. Soc., 81(8), 2205 (1998)

[8] Harshe G, Bhalla AS, Cross LE, Mater. Lett., 18, 173 (1994)

[9] German M, Kovba LM, Russ. J. Inorg. Chem., 28, 586 (1983)

[10] Groen WA, Van Berkel FPF, Ijdo DJW, Acta Cryst., C42, 1472 (1986)

[11] Young RA, Sakthivel A, Moss TS, Paivasantos CO, Georgia Institute of Techonology (1995)

[12] Hakki BW, Coleman PD, IRE Trans. Microwave Theory. Tech., 8, 402 (1960)

[13] Reaney IM, Colla EL, Setter N, Jpn. J. Appl. Phys, 33, 3984 (1994)

[14] Colla EL, Reaney IM, Setter N, J. Appl. Phys, 74, 3414 (1993)

[15] Glazer AM, Acta Cryst., A31, 756 (1975)

[16] Glazer AM, Acta Cryst., B28, 3384 (1972)

[17] Shannon RD, Acta Cryst., A32, 751 (1976)

[18] Woodward PM, Acta Cryst., B53, 44 (1997)