Results 11 to 20 of about 62,857 (189)

Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics [PDF]

Materials, 2022
(Nb5+, Si4+) co-doped TiO2 (NSTO) ceramics with the compositions (Nb0.5Si0.5)xTi1−xO2, x = 0, 0.025, 0.050 and 0.1 were prepared with a solid-state reaction technique. X-ray diffraction (XRD) patterns and Raman spectra confirmed that the tetragonal rutile is the main phase in all the ceramics.
Hicham Mahfoz Kotb, Adil Alshoaibi, Javed Mazher, Nagih M. Shaalan, Mohamad M. Ahmad   +4 more
core   +4 more sources

Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)xTi1-xO2 [PDF]

Sci Rep, 2017
This work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg2+, Ta5+) co-doped rutile TiO2 polycrystalline ceramics with nominal compositions of (Mg2+1/3Ta5+2/3) x
Liu, Y, Yongxiang Li, Zhou, C, Liu, Z, Zhifu Liu, Xu, Z, Yun Liu, Fu, Z, Wanbiao Hu, Hua Chen, Frankcombe, TJ ; https://orcid.org/, Wen Dong, Dong, W, Dehong Chen, Chao Zhou, Li, Y, Zhenxiao Fu, Xiaoyong Wei, Zhuo Xu, Chen, D, Hu, W, Wei, X, Terry J. Frankcombe, Chen, H   +23 more
core   +2 more sources

Crystalline Structure, Defect Chemistry and Room Temperature Colossal Permittivity of Nd-doped Barium Titanate [PDF]

Sci Rep, 2017
Dielectric materials with high permittivity are strongly demanded for various technological applications. While polarization inherently exists in ferroelectric barium titanate (BaTiO3), its high permittivity can only be achieved by chemical and/or ...
Jinhao Qiu, Qilin Gu, Qiu, Jinhao, Jing Wang, Sun, Qiaomei, Wang, Jing, Gu, Qilin, Jinsong Liu, Qiaomei Sun, Liu, Jinsong, Rongying Jin, Zhu, Kongjun, Jin, Rongying, Kongjun Zhu   +13 more
core   +2 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
openaire   +6 more sources

Effects of Charge Compensation on Colossal Permittivity and Electrical Properties of Grain Boundary of CaCu₃Ti₄O₁₂ Ceramics Substituted by Al³⁺ and Ta⁵⁺/Nb⁵⁺ [PDF]

Molecules, 2021
The effects of charge compensation on dielectric and electrical properties of CaCu3Ti4-x(Al1/2Ta1/4Nb1/4)xO12 ceramics (x = 0−0.05) prepared by a solid-state reaction method were studied based on the configuration of defect dipoles.
Jakkree Boonlakhorn, Jedsada Manyam, Pornjuk Srepusharawoot, Sriprajak Krongsuk, Prasit Thongbai   +4 more
doaj   +2 more sources

4D‐Printed Spin Crossover Metamaterials with Giant Programmable Positive or Negative Thermal Expansion [PDF]

Advanced Materials, Volume 38, Issue 32, 8 June 2026.
Spin crossover composite filaments are implemented for the rational design of 4D‐printed mechanical metamaterials. The obtained bi‐material structures guided by a theoretical analysis based on analytical calculations and Finite Element Analysis simulations exhibit giant programmable positive or negative deformation with coefficients of thermal ...
Adelais Trapali, Yuteng Zhang, Seyed Ehsan Alavi, Nagham Mawassy, Raja Zulkarnain, Gábor Molnár, Lionel Salmon, Azzedine Bousseksou   +7 more
wiley   +2 more sources

Optimization of low sintering temperature for colossal permittivity and humidity resistance in TiO2 based ceramics [PDF]

Scientific Reports
This study investigates the colossal permittivity (CP) and humidity resistance of (Sn1/2Nb1/2)0.025Ti0.975O2 ceramics. Increasing the sintering temperature enhanced both density and grain growth, with the fine–grained structure proving essential for ...
Yasumin Mingmuang, Narong Chanlek, Masaki Takesada, Ekaphan Swatsitang, Prasit Thongbai   +4 more
doaj   +2 more sources

Origin of colossal permittivity in BaTiO3 via broadband dielectric spectroscopy [PDF]

Journal of Applied Physics, 2013
Barium titanate (BT) ceramics with Ba/Ti ratios of 0.95 and 1.00 were synthesized using spark plasma sintering (SPS) technique. Dielectric spectroscopy (frequency range from 40 Hz to 1 MHz and temperature range from 300 K to 30 K) was performed on those ceramics (SPS BT). SPS BT showed extremely high permittivity up to ∼105, which can be referred to as
Han, Hyuksu, Voisin, Christophe, Guillemet-Fritsch, Sophie, Dufour, Pascal, Tenailleau, Christophe, Turner, Christopher, Nino, Juan C.   +6 more
openaire   +6 more sources

Enhanced dielectric properties of colossal permittivity co-doped TiO(2)/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.
Wong, Chi-Man, Lam, Kwok-ho, Wei, Xianhua, Dai, Jiyan, Huang, Long-Biao, Hao, Jianhua, Tse, Mei-Yan   +6 more
core   +2 more sources

Low sintering temperature enhancing colossal dielectric permittivity and humidity sensitivity in Ta5+ substituted TiO2 ceramics via high energy ball milling [PDF]

Scientific Reports
Nanostructured 1% and 10% Ta5⁺-substituted TiO2 (TTO) ceramics were synthesized via high-energy ball milling and sintered at 1200 °C and 1300 °C to investigate their dielectric and humidity sensing performance.
Chotchaya Phianjing, Nutthakritta Phromviyo, Navadecho Chankhunthod, Pornjuk Srepusharawoot, Pairot Moontragoon, Prasit Thongbai   +5 more
doaj   +2 more sources