Results 11 to 20 of about 2,269 (194)

Dielectric properties of colossal permittivity materials: An update [PDF]

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2011
During the last 10 years, a lot of interests have been devoted to the so-called CDC (colossal dielectric constant) materials. The first materials exhibiting this behavior were the perovskite-based ceramics on the CCTO (CaCu3Ti4O12) composition. Relative dielectric permittivity can attain values up to (or even larger than) 105.
Cheballah, Chafe, Valdez-Nava, Zarel, Laudebat, Lionel, Lebey, Thierry, Bidan, Pierre, Diaham, Sombel, Guillemet-Fritsch, Sophie   +6 more
openaire   +8 more sources

Colossal permittivity and low losses in Ba1–Sr TiO3– reduced nanoceramics [PDF]

Journal of the European Ceramic Society, 2016
The oxalate route offers a controlled approach to synthesize pure Ba1–xSrxTiO3 (BST) (0 ≤ x ≤ 1) nanoparticles (ϕ ≈ 150 nm in diameter). Reduced BST dense nanoceramics were obtained by spark plasma sintering (SPS) and then annealed for a short time to reach colossal permittivity ( = 105) with low dielectric losses (tan δ = 0.03) at 1 kHz and 300 K. The
Dupuis, Sébastien, Sulekar, Soumitra, Kim, Ji Hyun, Han, Hyuksu, Dufour, Pascal, Tenailleau, Christophe, Nino, Juan Claudio, Guillemet-Fritsch, Sophie   +7 more
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Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO3 ceramics

Journal of Advanced Ceramics, 2023
Defect engineering has been applied to prepare materials with modifiable dielectric properties. SrTiNbxO3 (x = 0, 0.003, 0.006, 0.009, 0.012) ceramics were synthesized using the traditional solid-state reaction method and sintered in a reducing ...
Jinghan Cai, Junlei Qi, Yueyang Yang, Xinyue Zhang, Yuan-Hua Lin   +4 more
doaj   +2 more sources

Conduction mechanism investigation in YCa2Cu3Oδ colossal permittivity ceramics

Results in Physics
Sol-gel synthesized YCa2Cu3Oδ ceramic exhibits giant permittivity εr′≈104, low loss tanδ0.3, and high stability over frequency and temperature. XRD revealed a tetragonal phase (P4/mmm). XPS confirmed high oxygen vacancy density.
Wael Chouk, Mohamed Annabi, Mouldi Zouaoui   +2 more
doaj   +3 more sources

Enhanced dielectric properties of colossal permittivity co-doped TiO₂/polymer composite films. [PDF]

RSC Adv, 2018
Colossal permittivity (CP) materials have shown great technological potential for advanced microelectronics and high-energy-density storage applications.
Tse MY, Wei X, Wong CM, Huang LB, Lam KH, Dai J, Hao J.   +6 more
europepmc   +5 more sources

Dielectric Properties of Co-Doped TiO₂ with Mg and Nb for Energy Storage Applications [PDF]

Nanomaterials
Titanium dioxide is attractive for energy storage due to its abundance, stability, non-toxicity, low cost, and favorable electronic/optical properties.
L. Ferchaud, J. P. F. Carvalho, S. R. Gavinho, F. Amaral, L. I. Toderascu, G. Socol, L. C. Costa, R. Benzerga, S. Soreto Teixeira   +8 more
doaj   +2 more sources

Mechanisms of enhanced performance in Zr4+/Ta5+ codoped rutile–TiO2 ceramics via broadband dielectric spectroscopy [PDF]

Scientific Reports
Aliovalent dopant codoped rutile–TiO2 materials have garnered attention due to their excellent performance properties, characterized by low loss tangent (tanδ), high dielectric permittivity (ε′), and stable ε′ over a broad temperature range.
Yasumin Mingmuang, Narong Chanlek, Masaki Takesada, Viyada Harnchana, Wirat Jarernboon, Pairot Moontragoon, Pornjuk Srepusharawoot, Ekaphan Swatsitang, Prasit Thongbai   +8 more
doaj   +2 more sources

Colossal Cryogenic Electro-Optic Response Through Metastability in Strained BaTiO₃ Thin Films. [PDF]

Adv Mater
Utilizing the thermodynamic theory of optical properties, a colossal cryogenic electro‐optic response in BaTiO3 thin films is designed and demonstrated by stabilizing a low symmetry metastable monoclinic phase via epitaxial strain tuning with an electro‐optic response reaching ≈2516 pm V−1 at 5 K. This approach represents a new paradigm for engineering
Suceava A, Hazra S, Ross A, Philippi IR, Sotir D, Brower B, Ding L, Zhu Y, Zhang Z, Sarkar H, Sarker S, Yang Y, Sarker S, Stoica VA, Schlom DG, Chen LQ, Gopalan V.   +16 more
europepmc   +2 more sources

The impact of lanthanum doping on the microstructure and colossal permittivity in BaxSr(1-x)TiO3

Open Ceramics, 2021
In this work BaSrTiO3 with three different Ba/Sr (45/55, 55/45 and 65/35) ratios and lanthanum doping concentrations of 0, 0.2, 0.4 and 0.6 ​mol.% were studied. Samples were fabricated through the mixed oxide route.
Kari Nurmi, Heli Jantunen, Jari Juuti
doaj   +1 more source

The Fundamental Mechanism Behind Colossal Permittivity in Oxides [PDF]

Advanced Materials, 2019
AbstractColossal permittivity materials exhibit extreme polarization in an applied electric field, providing applications in electronics and energy transmission. Understanding the atomic‐scale mechanism behind colossal permittivity remains a challenging task and is key to optimizing materials with this property.
Ned T. Taylor, Francis H. Davies, Shane G. Davies, Conor J. Price, Steven P. Hepplestone   +4 more
openaire   +2 more sources