Effects of MnO2 doping on microstructure and microwave dielectric properties of Ba4.2Nd9.2Ti18O54–NdAlO3 ceramics

Baoyu Huang, Zhefei Wang, Tao Chen, Lixi Wang, Zhenxiao Fu, Qitu Zhang

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

MnO2 doped Ba4.2Nd9.2Ti18O54–NdAlO3(13 wt%) (BNT–NA) microwave dielectric ceramics with the near zero τf and the wide range of sintering temperature were prepared by conventional solid state method. The effects of Mn4+ doping on the microstructures and microwave dielectric properties of BNT–NA ceramics were investigated. XRD patterns showed only a single BaNd2Ti5O14 phase was identified in all samples and there was no second phase. The sintering temperature decreased from 1,380 to 1,320 °C as MnO2 content increased from 0.1 to 0.9 wt%. The MnO2 doped BNT–NA ceramics could be densified at a lower sintering temperature. The MnO2 additive had a positive effect on lowing sintering temperature of BNT–NA ceramics. The τf varied from negative to positive with the increase of MnO2. Excellent microwave dielectric properties were achieved in Ba4.2Nd9.2Ti18O54–NdAlO3 ceramics doped with 0.3 wt% MnO2 and sintered at 1,380 °C for 2 h: εr = 66.5, Q × f = 13,948 GHz, τf = 0.4 ppm/°C.

Original languageEnglish
Pages (from-to)5264-5268
Number of pages5
JournalJournal of Materials Science: Materials in Electronics
Volume25
Issue number12
DOIs
StatePublished - 6 Nov 2014

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