scholarly journals Effect of oxygen vacancies on intrinsic dielectric permittivity of strontium titanate ceramics

2018 ◽  
Vol 126 (5) ◽  
pp. 263-268 ◽  
Author(s):  
Takuya HOSHINA ◽  
Ryuichi SASE ◽  
Junji NISHIYAMA ◽  
Hiroaki TAKEDA ◽  
Takaaki TSURUMI
Keyword(s):  
Dielectric Permittivity ◽  
Strontium Titanate ◽  
Oxygen Vacancies ◽  
Effect Of Oxygen ◽  
Titanate Ceramics

scholarly journals Point defects and their effect on dielectric permittivity in strontium titanate ceramics

2021 ◽  
Vol 53 (3) ◽  
pp. 285-299
Author(s):  
Darko Kosanovic ◽  
Jelena Zivojinovic ◽  
Jelena Vujancevic ◽  
Adriana Peles ◽  
Vladimir Blagojevic
Keyword(s):  
Dielectric Permittivity ◽  
Strontium Titanate ◽  
Oxygen Vacancies ◽  
Total Concentration ◽  
Tetragonal Distortion ◽  
Central Position ◽  
Charge Imbalance ◽  
Cubic Lattice ◽  
Titanium Center ◽  
Titanate Ceramics

The origin of dielectric properties of strontium titanate ceramics is investigated using DFT calculations in periodic system. It was determined that the main factors contributing to the increase in dielectric permittivity are: tetragonal distortion of the normally cubic lattice, and charge imbalance induced displacement of titanium center from its central position. Oxygen vacancies were determined to create significantly larger effects than other types of vacancies, like Ti and SrO. The extent of tetragonal distortion was found to be determined by oxygen vacancy distribution, rather than total concentration: relatively symmetrical distribution of oxygen vacancies resulted in smaller tetragonal distortion of the lattice, and, consequently, smaller increase in dielectric permittivity. Charge imbalance naturally destabilizes the cubic lattice, forcing the Ti-atom out of its central position, resulting in tetragonal lattice with increased dielectric permittivity. The process stabilizes the strontium titanate lattice, while increasing the c/a ratio. Therefore, the dielectric permittivity of strontium titanate can be increased by changes to the system that increase tetragonal distortion of the lattice and/or introduce additional negative charge.

Colossal dielectric performance of pure barium titanate ceramics consolidated by spark plasma sintering

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75422-75429 ◽  
Author(s):  
X. Yang ◽  
D. Li ◽  
Z. H. Ren ◽  
R. G. Zeng ◽  
S. Y. Gong ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Barium Titanate ◽  
Dielectric Permittivity ◽  
Oxygen Vacancies ◽  
High Permittivity ◽  
Low Dielectric ◽  
Plasma Sintering ◽  
Dielectric Performance ◽  
Spark Plasma ◽  
Titanate Ceramics

The pure BaTiO3 nanoceramics have a high permittivity up to 6 × 104 and a low dielectric loss. The polaron dipoles configured by oxygen vacancies and Ti3+ cations within grains could contribute to the colossal dielectric permittivity of the ceramics.

Enhancement of the dielectric permittivity and magnetic properties of Dy substituted strontium titanate ceramics

2018 ◽  
Vol 38 (2) ◽  
pp. 605-611 ◽  
Author(s):  
Alexander Tkach ◽  
João S. Amaral ◽  
Sebastian Zlotnik ◽  
Vítor S. Amaral ◽  
Paula M. Vilarinho
Keyword(s):  
Magnetic Properties ◽  
Dielectric Permittivity ◽  
Strontium Titanate ◽  
Titanate Ceramics

Structure–microstructure–dielectric tunability relationship in Mn-doped strontium titanate ceramics

2005 ◽  
Vol 53 (19) ◽  
pp. 5061-5069 ◽  
Author(s):  
Alexander Tkach ◽  
Paula M. Vilarinho ◽  
Andrei L. Kholkin
Keyword(s):  
Strontium Titanate ◽  
Dielectric Tunability ◽  
Titanate Ceramics ◽  
Mn Doped

scholarly journals Oxygen vacancies in strontium titanate: A DFT+DMFT study

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Jaime Souto-Casares ◽  
Nicola A. Spaldin ◽  
Claude Ederer
Keyword(s):  
Strontium Titanate ◽  
Oxygen Vacancies

Effect of oxygen vacancies and crystal symmetry on piezocatalytic properties of Bi2WO6 ferroelectric nanosheets for wastewater decontamination

2021 ◽  
Author(s):  
Zihan Kang ◽  
Enzhu Lin ◽  
Ni Qin ◽  
Jiang Wu ◽  
Baowei Yuan ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Oxygen Vacancies ◽  
Mechanical Energy ◽  
Crystal Symmetry ◽  
Characteristic P ◽  
Novel Technique ◽  
Effect Of Oxygen

Piezocatalysis emerged as a novel technique to make use of mechanical energy in dealing with organic pollutants in wastewater. In this work, the ferroelectric Bi2WO6 (BWO) nanosheets with a characteristic...

A Red Long-Lasting Phosphorescence Material Gd9.33(SiO4)6O2:Sm3+and Effect of Oxygen Vacancies on Its Performance

2013 ◽  
Vol 2 (9) ◽  
pp. R161-R164 ◽  
Author(s):  
Gen Li ◽  
Yuhua Wang ◽  
Shaochun Han ◽  
Wei Zeng ◽  
Wenbo Chen ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Effect Of Oxygen

Electrical property effect of oxygen vacancies in the heterojunction of LaGaO 3 / SrTiO 3

2017 ◽  
Vol 26 (3) ◽  
pp. 037101
Author(s):  
Fu-Ning Wang ◽  
Ji-Chao Li ◽  
Xin-Miao Zhang ◽  
Han-Zhang Liu ◽  
Jian Liu ◽  
...  
Keyword(s):  
Electrical Property ◽  
Oxygen Vacancies ◽  
Effect Of Oxygen
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