Strongly Enhanced Dielectric Response and Structural Investigation of (Sr2+, Ge4+) Co-Doped CCTO Ceramics

2020 ◽  
Vol 124 (38) ◽  
pp. 20682-20692
Author(s):  
Jakkree Boonlakhorn ◽  
Narong Chanlek ◽  
Prasit Thongbai ◽  
Pornjuk Srepusharawoot
Keyword(s):  
Dielectric Response ◽  
Structural Investigation ◽  
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.

Eu3+-Doped Y3−xNdxAl3O12 garnet: synthesis and structural investigation

2017 ◽  
Vol 19 (5) ◽  
pp. 3729-3737 ◽  
Author(s):  
L. Pavasaryte ◽  
A. Katelnikovas ◽  
V. Klimavicius ◽  
V. Balevicius ◽  
A. Krajnc ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Structural Investigation ◽  
Sol Gel ◽  
Environmentally Friendly ◽  
Yttrium Aluminium Garnet ◽  
Gel Method ◽  
Sol Gel Method ◽  
Yttrium Aluminium ◽  
Co Doped

Nd3+-doped yttrium aluminium garnet and Eu3+–Nd3+-co-Doped yttrium aluminium garnet were synthesized using an environmentally friendly sol–gel method at low temperatures.

Giant dielectric response and charge compensation of Li- and Co-doped NiO ceramics

2012 ◽  
Vol 177 (9) ◽  
pp. 673-677 ◽  
Author(s):  
Yunhua Li ◽  
Liang Fang ◽  
Laijun Liu ◽  
Yanming Huang ◽  
Changzheng Hu
Keyword(s):  
Dielectric Response ◽  
Charge Compensation ◽  
Giant Dielectric ◽  
Co Doped

Optical and structural investigation of Sm3+–Nd3+ co-doped in magnesium lead borosilicate glasses

2013 ◽  
Vol 74 (3) ◽  
pp. 410-417 ◽  
Author(s):  
T.G.V.M. Rao ◽  
A.Rupesh Kumar ◽  
N. Veeraiah ◽  
M.Rami Reddy
Keyword(s):  
Structural Investigation ◽  
Borosilicate Glasses ◽  
Co Doped

scholarly journals Origin of colossal dielectric response in (In + Nb) co-doped TiO2 rutile ceramics: a potential electrothermal material

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Shanming Ke ◽  
Tao Li ◽  
Mao Ye ◽  
Peng Lin ◽  
Wenxiang Yuan ◽  
...  
Keyword(s):  
Dielectric Response ◽  
Doped Tio2 ◽  
Tio2 Rutile ◽  
Co Doped

scholarly journals Fe3+/Nb5+ Co-doped rutile–TiO2 nanocrystalline powders prepared by a combustion process: preparation and characterization and their giant dielectric response

RSC Advances ◽  
2020 ◽  
Vol 10 (42) ◽  
pp. 24784-24794
Author(s):  
Theeranuch Nachaithong ◽  
Pairot Moontragoon ◽  
Narong Chanlek ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Response ◽  
Combustion Process ◽  
Nanocrystalline Powders ◽  
Rutile Tio2 ◽  
Giant Dielectric ◽  
Co Doped

Fe3+/Nb5+ co-doped TiO2 (FeNb-TO) nanocrystalline powders were prepared by a combustion process.

Sign in / Sign up

Export Citation Format

Share Document