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- Title
Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO 2 Ceramics.
- Authors
Kotb, Hicham Mahfoz; Alshoaibi, Adil; Mazher, Javed; Shaalan, Nagih M.; Ahmad, Mohamad M.
- Abstract
(Nb5+, Si4+) co-doped TiO2 (NSTO) ceramics with the compositions (Nb0.5Si0.5)xTi1−xO2, x = 0, 0.025, 0.050 and 0.1 were prepared with a solid-state reaction technique. X-ray diffraction (XRD) patterns and Raman spectra confirmed that the tetragonal rutile is the main phase in all the ceramics. Additionally, XRD revealed the presence of a secondary phase of SiO2 in the co-doped ceramics. Impedance spectroscopy analysis showed two contributions, which correspond to the responses of grain and grain-boundary. All the (Nb, Si) co-doped TiO2 showed improved dielectric performance in the high frequency range (>103 Hz). The sample (Nb0.5Si0.5)0.025Ti0.975O2 showed the best dielectric performance in terms of higher relative permittivity (5.5 × 104) and lower dielectric loss (0.18), at 10 kHz and 300 K, compared to pure TiO2 (1.1 × 103, 0.34). The colossal permittivity of NSTO ceramics is attributed to an internal barrier layer capacitance (IBLC) effect, formed by insulating grain-boundaries and semiconductor grains in the ceramics.
- Subjects
TITANIUM dioxide; PERMITTIVITY; CERAMICS; RAMAN spectroscopy; IMPEDANCE spectroscopy; DIELECTRIC loss
- Publication
Materials (1996-1944), 2022, Vol 15, Issue 13, p4701
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma15134701