Effects of Additives on Dielectric Properties of Y2Ti2O7 Ceramics

doi:10.3724/SP.J.1077.2010.10563

Journal of Inorganic Materials ›› 2011, Vol. 26 ›› Issue (3): 327-331.DOI: 10.3724/SP.J.1077.2010.10563

• Research Letter • Previous Articles Next Articles

Effects of Additives on Dielectric Properties of Y₂Ti₂O₇ Ceramics

DING Jia-Yu¹, XIAO Yuan¹, WANG Zhe-Fei¹, WANG Li-Xi¹, ZHANG Qi-Tu¹,²

1.College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009, China; 2.Jiangsu Provincial Key Laboratory of New Materials of Inorganic and Its Composites,Nanjing University of Technology ,Nanjing 210009, China

Received:2010-08-30 Revised:2010-11-12 Published:2011-03-20 Online:2011-02-18
About author:DING Jia-Yu (1986-), female,candidate of master.
Supported by:
Foundation item:Key University Science Research Project of Jiangsu Province (08KJA430002)

Abstract

Abstract: The effects of CrO₃,Nb₂O₅ ,SiO₂ and Al₂O₃on the sintering characteristics,phase composition and microwave dielectric properties of Y₂Ti₂O₇ ceramics were investigated. It was found that Nb₂O₅can lower the sintering temperature, increase the permittivity and quality factor of Y₂Ti₂O₇ ceramics, and cause great change of the temperature coefficient of resonant frequency.With the increase of Nb ₂O₅ content, it illustrated that all the samples exhibited cubicpyrochlore-type Y₂Ti₂O₇ as main crystallinephase, and Nb⁵⁺ might be considered to partially substitute for Ti⁴⁺.The experimental results showed that1 mol% Nb₂O₅ doped ceramics sintered at1420℃exhibited optimum microwave dielectricproperties: ε_r=61.8, Q× f =9096 GHz (f=5.494 GHz) and τ_f=54×10 ^-⁶/℃.

Key words: ceramics, crystal growth, X-ray diffraction, dielectric properties, modification

CLC Number:

TQ174

DING Jia-Yu, XIAO Yuan, WANG Zhe-Fei, WANG Li-Xi, ZHANG Qi-Tu,. Effects of Additives on Dielectric Properties of Y₂Ti₂O₇ Ceramics[J]. Journal of Inorganic Materials, 2011, 26(3): 327-331.

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Effects of Additives on Dielectric Properties of Y₂Ti₂O₇ Ceramics

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