Article
Biochemistry & Molecular Biology
Porntip Siriya, Pairot Moontragoon, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: The effects of sintering temperature and doping level concentration on the microstructures, dielectric response, and electrical properties of W6+-doped TiO2 were investigated. The study found that increasing the doping level concentration led to increased grain size and improved low-temperature dielectric response.
Article
Materials Science, Ceramics
Jutapol Jumpatam, Bundit Putasaeng, Narong Chanlek, Jedsada Manyam, Pornjuk Srepusharawoot, Sriprajak Krongsuk, Prasit Thongbai
Summary: The (Sn-F) codoped CCTO ceramics were studied for their microstructure, dielectric response, and electrical properties. With decreased mean grain size and increased codopant concentration, the ceramics showed reduced loss tangent and improved electrical performance. This method has the potential to enhance dielectric and nonlinear electrical properties in other polycrystalline ceramics as well.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
A. K. Thomas, Merin George, Kevin Abraham, D. Sajan
Summary: Polycrystalline SCTO ceramics exhibit tremendously high dielectric permittivity ε' at low frequencies, with two distinct, thermally triggered dielectric relaxations. The electrical and dielectric behaviors of SCTO ceramics are reasonably analogous to those of CCTO ceramics.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Yong Guo, Junlang Tan, Jingchang Zhao
Summary: NaF was composited into CCTO with excess Ti to prepare NaF/CCTO composite ceramics, and its physical and chemical properties were characterized. HRTEM revealed particle deposition on CCTO surface. FESEM showed the presence of nanocrystalline structures inside the grains in NaF/CCTO composite ceramics. Dielectric spectroscopy confirmed the significant improvement of CCTO's dielectric properties by NaF and excessive Ti. The dielectric constant of NaF-0.1 sample reached 2.7 x 106 and 5.1 x 105 at 20 Hz and 1 kHz, respectively.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Pariwat Saengvong, Narong Chanlek, Pornjuk Srepusharawoot, Viyada Harnchana, Prasit Thongbai
Summary: It has been widely investigated to improve the dielectric properties of ACu(3)Ti(4)O(12) ceramics by various strategies. However, it is usually a trade-off between the reduction in the loss tangent (tan delta) and the decreased dielectric permittivity (epsilon '). In this study, Ta5+ doping was found to significantly increase epsilon ' and reduce tan delta in Na1/2Y1/2Cu3Ti4O12 ceramics. The improved properties were attributed to the segregation of Cu- and Ta-rich phases along the grain boundaries and the increased Cu+/Cu2+, Cu3+/Cu2+, and Ti3+/Ti4+ ratios.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Jakkree Boonlakhorn, Jirata Prachamon, Jedsada Manyam, Prasit Thongbai, Pornjuk Srepusharawoot
Summary: The structural and electrical parameters of CaCu2.90Ni0.10Ti4-xGexO12 ceramics were studied using solid-state reaction approach, revealing the significant improvement in dielectric permittivity and low loss tangents with the addition of Ge4+ ions, mainly due to an internal barrier layer capacitor effect.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Fei Xue, Yahui Tian, Fangfang Guo, Lan Qiu, Weijun Wang, Weikang Tang
Summary: In this study, the 0.8BiFeO3-0.2GdFeO3 (BFO-GFO) ceramics were synthesized by solid-state reaction method. The results showed that the ceramics exhibited significant ferroelectricity, high density, and excellent relaxor ferroelectric behavior. The conductivity of the ceramics was found to be influenced by the ionization of oxygen vacancies.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Ceramics
Jutapol Jumpatam, Jirata Prachamon, Jakkree Boonlakhorn, Nutthakritta Phromviyo, Narong Chanlek, Prasit Thongbai
Summary: A solid-state reaction method was used to prepare CaCu3-xMgxTi4O12-2xF2x ceramics with different Mg and F co-doping ratios. The effect of doping ratio on the structure and properties of the ceramics was studied.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2022)
Article
Materials Science, Ceramics
Jakkree Boonlakhorn, Narong Chanlek, Jedsada Manyam, Pornjuk Srepusharawoot, Sriprajak Krongsuk, Prasit Thongbai
Summary: In this study, greatly enhanced breakdown electric field and nonlinear coefficient with reduced tan delta were achieved by simultaneous partial substitution of CCTO with acceptor-donor (Al3+, Ta5+) dopants to produce (Al3+, Ta5+)-CCTO ceramics. The improved electrical properties were attributed to the synergistic effects of the co-dopants in the doped CCTO structure, leading to enhanced grain boundary resistance. These results provide useful guidelines for developing new giant dielectric ceramics with excellent dielectric properties.
JOURNAL OF ADVANCED CERAMICS
(2021)
Article
Materials Science, Ceramics
Sushmita Dwivedi, Manish Badole, Hari Narayanan Vasavan, Sunil Kumar
Summary: The electrical conduction behavior of lead-free BiZnNbO ceramics annealed in different atmospheres was studied, with the sample annealed in oxygen environment showing the lowest conductivity due to reduced oxygen vacancy defects. An anomaly observed at 250 degrees Celsius in dielectric plots for certain samples was attributed to defect relaxation.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Fangyi Huang, Hua Su, Qin Zhang, Xiaohui Wu, Yulan Jing, Yuanxun Li, Xiaoli Tang
Summary: The effect of Ti substitution on the microwave dielectric properties and structural characteristics of CaMgSi2O6 ceramics was investigated. It was found that the increase in Ti content led to the formation of CaTiO3, and the permittivity was correlated with ionic polarizability. The quality factor and temperature coefficient of resonant frequency were significantly influenced by lattice stability. Lattice energy and cation bonding also affected the microwave dielectric properties, and adjusting these parameters improved the performance of the ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Biochemistry & Molecular Biology
Pariwat Saengvong, Jakkree Boonlakhorn, Narong Chanlek, Nutthakritta Phromviyo, Viyada Harnchana, Pairot Moontragoon, Pornjuk Srepusharawoot, Sriprajak Krongsuk, Prasit Thongbai
Summary: This study investigated the effects of sintering conditions on the properties of TiO2-excessive Na1/2Y1/2Cu3Ti4.1O12 ceramics. It was found that pure phase ceramics could be achieved under specific sintering conditions, and the grain size and electrical properties varied with different sintering conditions.
Article
Chemistry, Physical
Hicham Mahfoz Kotb, Hassan A. Khater, Osama Saber, Mohamad M. Ahmad
Summary: NSCTO ceramics were prepared by reactive sintering solid-state reaction, and the influence of sintering temperature on structural and dielectric properties was thoroughly studied. The ceramic sample sintered at 1025 degrees C showed the best compromise between colossal relative permittivity and low dielectric loss values.
Article
Materials Science, Ceramics
Seong Wook Cho, Jeong Min Baik, Young Hun Jeong
Summary: Dielectric, ferroelectric, and piezoelectric properties of 0.36(Bi1-xSmx)ScO3-0.64PbTiO3 (BSPT-xSm) ceramics were studied for high temperature piezo-electric device application. Sm-substitution in BSPT-xSm ceramics resulted in degradation of their rhombohedral side and enhancement of dielectric constant. However, the grain size and ferroelectric behavior showed insignificant variations. The BSPT-3%Sm ceramic exhibited excellent piezoelectric values and a high ferroelectric transition temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Kai Zhang, Lingxia Li, Menglong Wang, Weijia Luo, Wenbo Wang
Summary: By adjusting donor ions doping and the distribution of oxygen vacancies, BaTiO3 ceramics with colossal permittivity and high insulation resistivity can be achieved, providing a technical basis for the preparation of single-layer microchip capacitors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
