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- Title
Preparation and properties of La and Nb co-doped TiO<sub>2</sub> colossal dielectric ceramic materials.
- Authors
Wang, X. W.; Zheng, Y. P.; Liang, B. K.; Zhang, G.; Shi, Y. C.; Zhang, B. H.; Xue, L. L.; Shang, S. Y.; Shang, J.; Yin, S. Q.; Hu, Y. C.
- Abstract
In this study, La + Nb co-doped TiO2 (LNTO; x = 0, 0.02, 0.05, 0.07) ceramics were prepared by the solid-state reaction method with high-purity TiO2, La2O3 and Nb2O5 powders. LNTO ceramics show dense microstructures with the second phase at the grain boundary, and La and Nb addition can inhibit the grain growth. Results of dielectric properties show that the dielectric constant of LNTO ceramics are enhanced largely (ε′ > 104) and that the dielectric loss is relatively low (tan δ ~ 0.1) compared with that of pure TiO2 (ε′ ~ 102) at low frequency. Within the test temperature range (30–500 °C) and test frequency range (0.5–1000 kHz), dielectric constants of LNTO ceramics display relatively high stability. The two peaks in modulus spectra could be explained by Maxwell–Wagner polarization. The results of dielectric and impedance spectra prove that the internal barrier layer capacitance model can be used to explain the colossal permittivity in (La + Nb) co-doped TiO2.
- Subjects
DIELECTRIC materials; PERMITTIVITY; DIELECTRIC properties; CERAMIC materials; DIELECTRIC loss; CRYSTAL grain boundaries; ELECTRIC capacity
- Publication
Journal of Materials Science: Materials in Electronics, 2020, Vol 31, Issue 18, p16044
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-020-04169-x