Good thermal stability, giant permittivity, and low dielectric loss for X9R‐type (Ag1/4Nb3/4)0.005Ti0.995O2 ceramics

With the intense demand of the developing microelectronics market, the study of giant permittivity dielectric materials is being promoted. However, it is difficult to obtain suitable dielectric materials for such applications, especially due to high dielectric loss at low frequencies. In this work,...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2019-03, Vol.102 (3), p.970-975
Main Authors: Peng, Hui, Liang, Pengfei, Zhou, Xiaobin, Peng, Zhanhui, Xiang, Yichen, Chao, Xiaolian, Yang, Zupei
Format: Article
Language:English
Subjects:
Ceramics
Dielectric loss
Dielectric properties
Electronics
giant permittivity
Microstructure
Permittivity
Sintering
sintering conditions
Thermal stability
TiO2
Titanium dioxide
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Summary:With the intense demand of the developing microelectronics market, the study of giant permittivity dielectric materials is being promoted. However, it is difficult to obtain suitable dielectric materials for such applications, especially due to high dielectric loss at low frequencies. In this work, Ag+Nb codoped TiO2 ceramics were designed and fabricated in a conventional solid reaction by sintering at 1290‐1340°C for 5‐10 hours. The issue of how the microstructure and dielectric properties of (Ag1/4Nb3/4)0.005Ti0.995O2 ceramics are affected by the sintering conditions was discussed. By optimizing sintering conditions, a dense microstructure, a high dielectric constant (εr ≈ 9410), and a low dielectric loss (tanδ ≈ 0.037) at 1 kHz were achieved. Most importantly, the temperature coefficient value of εr at different frequencies remained stable between −14.3% and 13.7% within the temperature range from −190 to 200°C, which has potential applications in X9R capacitor.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.16169