Effects of sintering atmosphere on microstructure and dielectric properties of (Yb + Nb) co-doped rutile TiO2 ceramics

2017 ◽  
Vol 715 ◽  
pp. 170-175 ◽  
Author(s):  
Xiao-gang Zhao ◽  
Peng Liu
Keyword(s):  
Dielectric Properties ◽  
Sintering Atmosphere ◽  
Rutile Tio2 ◽  
Co Doped

scholarly journals The Primary Origin of Excellent Dielectric Properties of (Co, Nb) Co-Doped TiO2 Ceramics: Electron-Pinned Defect Dipoles vs. Internal Barrier Layer Capacitor Effect

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3230
Author(s):  
Theeranuch Nachaithong ◽  
Narong Chanlek ◽  
Pairot Moontragoon ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Properties ◽  
Loss Tangent ◽  
Barrier Layer ◽  
Dielectric Response ◽  
High Resistivity ◽  
Low Loss ◽  
Rutile Tio2 ◽  
Complex Defect ◽  
Very High ◽  
Co Doped

(Co, Nb) co-doped rutile TiO2 (CoNTO) nanoparticles with low dopant concentrations were prepared using a wet chemistry method. A pure rutile TiO2 phase with a dense microstructure and homogeneous dispersion of the dopants was obtained. By co-doping rutile TiO2 with 0.5 at.% (Co, Nb), a very high dielectric permittivity of ε′ » 36,105 and a low loss tangent of tanδ » 0.04 were achieved. The sample–electrode contact and resistive outer-surface layer (surface barrier layer capacitor) have a significant impact on the dielectric response in the CoNTO ceramics. The density functional theory calculation shows that the 2Co atoms are located near the oxygen vacancy, creating a triangle-shaped 2CoVoTi complex defect. On the other hand, the substitution of TiO2 with Nb atoms can form a diamond-shaped 2Nb2Ti complex defect. These two types of complex defects are far away from each other. Therefore, the electron-pinned defect dipoles cannot be considered the primary origins of the dielectric response in the CoNTO ceramics. Impedance spectroscopy shows that the CoNTO ceramics are electrically heterogeneous, comprised of insulating and semiconducting regions. Thus, the dielectric properties of the CoNTO ceramics are attributed to the interfacial polarization at the internal insulating layers with very high resistivity, giving rise to a low loss tangent.

scholarly journals Annealing effects on the structural and dielectric properties of (Nb + In) co-doped rutile TiO2 ceramics

RSC Advances ◽  
2019 ◽  
Vol 9 (15) ◽  
pp. 8364-8368 ◽  
Author(s):  
Lanling Zhao ◽  
Jun Wang ◽  
Zhigang Gai ◽  
Jichao Li ◽  
Jian Liu ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Dielectric Properties ◽  
Electronic Structures ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
Rutile Tio2 ◽  
Annealing Effects ◽  
Co Doped

Density functional theory calculations were conducted to investigate the electronic structures of rutile Ti16O32, Ti13Nb2InO32, and Ti13Nb2InO31 systems.

High-performance giant-dielectric properties of rutile TiO2 co-doped with acceptor-Sc3+ and donor-Nb5+ ions

2017 ◽  
Vol 703 ◽  
pp. 139-147 ◽  
Author(s):  
Wattana Tuichai ◽  
Supamas Danwittayakul ◽  
Narong Chanlek ◽  
Prasit Thongbai ◽  
Santi Maensiri
Keyword(s):  
Dielectric Properties ◽  
High Performance ◽  
Rutile Tio2 ◽  
Giant Dielectric ◽  
Co Doped

Microstructure and dielectric properties of (Nb + In) co-doped rutile TiO2 ceramics

2014 ◽  
Vol 116 (7) ◽  
pp. 074105 ◽  
Author(s):  
Jinglei Li ◽  
Fei Li ◽  
Yongyong Zhuang ◽  
Li Jin ◽  
Linghang Wang ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Rutile Tio2 ◽  
Co Doped

Phosphor and nitrogen co-doped rutile TiO2 covered on TiN for oxygen reduction reaction in acidic media

2019 ◽  
Vol 9 (3) ◽  
pp. 611-619 ◽  
Author(s):  
Mitsuharu Chisaka ◽  
Hiroyuki Morioka
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Sites ◽  
Reduction Reaction ◽  
Acidic Media ◽  
Rutile Tio2 ◽  
Co Doped

Phosphor and nitrogen atoms were co-doped into rutile TiO2 phase on TiN to produce new active sites for oxygen reduction reaction.

Ferroelectric relaxor behavior and dielectric properties of La/Y co-doped (Ba0.9Ca0.1)(Zr0.2Ti0.8)O3 ceramics

2016 ◽  
Vol 27 (6) ◽  
pp. 6150-6155 ◽  
Author(s):  
Anqi Li ◽  
Yu Wang ◽  
Liu Yang ◽  
Ping Yang ◽  
Gang Wang ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Relaxor Behavior ◽  
Ferroelectric Relaxor ◽  
Co Doped

scholarly journals Co-doped rutile TiO2-δthin films studied by XANES and first principles calculations

2009 ◽  
Vol 190 ◽  
pp. 012107 ◽  
Author(s):  
Qinghua Liu ◽  
Yong Jiang ◽  
Wensheng Yan ◽  
Zhihu Sun ◽  
Zhiyun Pan ◽  
...  
Keyword(s):  
First Principles ◽  
First Principles Calculations ◽  
Rutile Tio2 ◽  
Co Doped
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