Improved Densification and Microwave Dielectric Properties of · 5TiO2 Modified with an Iso-Component Borate Glass

Dong Joo Shin; Hyung Sub Lee; Yong Soo Cho

Korean Journal of Materials Research, Vol.18, No.2, 107-111, February, 2008

DOI10.3740/MRSK.2008.18.2.107 Export Citation

Improved Densification and Microwave Dielectric Properties of · 5TiO2 Modified with an Iso-Component Borate Glass

Dong Joo Shin^†, Hyung Sub Lee, and Yong Soo Cho

Department of Materials Science and Engineering, Yonsei University, Seoul, Korea 120-749

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BaO·Nd2O3·5TiO2 (BNT) ceramics modified with a borate glass containing Ba, Nd and Ti as glass constituents were investigated with regard to their sintering behavior and microwave dielectric properties. An addition of iso-component glass significantly improved the sinterabilty of the BNT ceramics and lowered the sintering temperature. A maximum density of 5.29 g/cm3 and an x-y shrinkage of 17% were obtained for BNT ceramics containing 10wt.% of the glass sintered at 1100oC. The dielectric composition without the glass additive was only slightly densified at 1100oC. The resulting sample exhibited two crystalline phases, BaNd2Ti5O14 and Ba2Ti9O20, regardless of sintering temperature and glass content. When >10wt.% glass was added, exaggerated grain growth with a less uniform microstructure was found, resulting in the subsequent reduction of the fired density and the dielectric properties. BNT ceramics containing 10wt.% of the isocomponent glass sintered at 1100oC for 4 h showed promising dielectric properties of k = 71.3 and Q = 1,330.

Keywords:titanates;glass-ceramic;microwave dielectric;densification

[References]

Valant M, Suvorov D, Mater. Chem. Phys., 79(2-3), 104 (2003)
Lo CL, Duh JG, Chiou DS, Lee WH, J. Am. Ceram. Soc., 85, 2230 (2002)
Zeng Q, Li W, Shi JL, Guo JK, Zuo MW, Wu WJ, J. Am. Ceram. Soc., 89(5), 1733 (2006)
Chen XM, Suzuki Y, Sato N, J. Mater. Sci.: Mater. Electron., 6, 10 (1995)
Cho YS, Yoon KH, Handbook of Advanced Electronic and Photonic Materials and Devices; pp. 175- 99, Academic Press, San Diego, 2001. (2001)
Nenasheva EA, Kartenko NF, J. Eur. Ceram. Soc., 21, 2697 (2001)
Ioachim A, Toacsan MI, Banciu MG, Nedelcu L, Alexandru H, Berbecaru C, Ghetu D, Stoica G, Mater. Sci. Eng. B, 109, 183 (2004)
Chen XM, J. Mater. Sci. Lett., 14(15), 1041 (1995)
Yamada A, Utsumi Y, Watarai H, Jpn. J. Appl. Phys., 30, 2350 (1991)
Xia YD, Shi GH, Wu D, Liu ZG, Thin Solid Films, 472(1-2), 208 (2005)
Lu CH, Huang YH, Mater. Sci. Eng. B, 98, 33 (2003)

[1] Valant M, Suvorov D, Mater. Chem. Phys., 79(2-3), 104 (2003)

[2] Lo CL, Duh JG, Chiou DS, Lee WH, J. Am. Ceram. Soc., 85, 2230 (2002)

[3] Zeng Q, Li W, Shi JL, Guo JK, Zuo MW, Wu WJ, J. Am. Ceram. Soc., 89(5), 1733 (2006)

[4] Chen XM, Suzuki Y, Sato N, J. Mater. Sci.: Mater. Electron., 6, 10 (1995)

[5] Cho YS, Yoon KH, Handbook of Advanced Electronic and Photonic Materials and Devices; pp. 175- 99, Academic Press, San Diego, 2001. (2001)

[6] Nenasheva EA, Kartenko NF, J. Eur. Ceram. Soc., 21, 2697 (2001)

[7] Ioachim A, Toacsan MI, Banciu MG, Nedelcu L, Alexandru H, Berbecaru C, Ghetu D, Stoica G, Mater. Sci. Eng. B, 109, 183 (2004)

[8] Chen XM, J. Mater. Sci. Lett., 14(15), 1041 (1995)

[9] Yamada A, Utsumi Y, Watarai H, Jpn. J. Appl. Phys., 30, 2350 (1991)

[10] Xia YD, Shi GH, Wu D, Liu ZG, Thin Solid Films, 472(1-2), 208 (2005)

[11] Lu CH, Huang YH, Mater. Sci. Eng. B, 98, 33 (2003)