Study of frequency dependent dielectric response and ferroelectric behaviour of (Nd,Ni) co-doped BiFeO3

2020 ◽  
Author(s):  
Mehroosh Fatema ◽  
Shahid Husain ◽  
Samiya Manzoor ◽  
Anand Somvanshi ◽  
Naima Zarrin ◽  
...  
Keyword(s):  
Dielectric Response ◽  
Frequency Dependent ◽  
Co Doped ◽  
Ferroelectric Behaviour

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.

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

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

Temperature and frequency dependent dielectric response of C3H7NH3PbI3: A new hybrid perovskite

2020 ◽  
Vol 127 (20) ◽  
pp. 204103 ◽  
Author(s):  
Payal Sengupta ◽  
Priyabrata Sadhukhan ◽  
Apurba Ray ◽  
Ruma Ray ◽  
Satyaranjan Bhattacharyya ◽  
...  
Keyword(s):  
Dielectric Response ◽  
Frequency Dependent ◽  
Hybrid Perovskite

Frequency dependent energy storage and dielectric performance of Ba–Zr Co-doped BiFeO3 loaded PVDF based mechanical energy harvesters: effect of corona poling

Soft Matter ◽  
2020 ◽  
Vol 16 (36) ◽  
pp. 8492-8505 ◽  
Author(s):  
Abhishek Sasmal ◽  
Shrabanee Sen ◽  
P. Sujatha Devi
Keyword(s):  
Energy Storage ◽  
Energy Harvesting ◽  
Mechanical Energy ◽  
Composite Films ◽  
Frequency Dependent ◽  
Energy Harvesters ◽  
Dielectric Performance ◽  
Corona Poling ◽  
Co Doped

Corona poling improved the energy storage and mechanical energy harvesting performance of PVDF–Bi0.95Ba0.05Fe0.95Zr0.05O3 composite films.

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