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Your search keyword '"Qing-Wei Fu"' showing total 4 results
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4 results on '"Qing-Wei Fu"'

1. Large enhancement of piezoelectric properties in Mn-modified SrBi4Ti4O15 and its thermal stabilities at elevated temperatures

Author

Kenny Lau, Qing-Wei Fu, Chun-Ming Wang, Hu-He Tian, Zhao-Peng Cao, De-Fu Yin, and Qian Wang

Subjects
Materials science, Bismuth titanate, Analytical chemistry, Mineralogy, chemistry.chemical_element, 02 engineering and technology, Manganese, Conductivity, 01 natural sciences, Ion, chemistry.chemical_compound, 0103 physical sciences, Materials Chemistry, Ceramic, 010302 applied physics, Strontium, Process Chemistry and Technology, 021001 nanoscience & nanotechnology, Piezoelectricity, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, visual_art, Ceramics and Composites, visual_art.visual_art_medium, Curie temperature, 0210 nano-technology
Abstract

Manganese-modified strontium bismuth titanate (SrBi4Ti4O15, SBT) ceramic oxides were synthesized by substituting a small amount of manganese ions into the Ti4+ sites using conventional solid-state reaction. The resultant Mn-modified SBT (SBT-Mn) exhibits better piezoelectric properties in comparison to unmodified SBT. The piezoelectric properties of Mn-modified SBT is optimized with only 4 mol% Mn substitution. SBT-4Mn exhibits a large piezoelectric constant (d33=30 pC/N), approximately twice the value of unmodified SBT (d33=13 pC/N), while its Curie temperature, Tc, remains almost unchanged at ~530 °C. The temperature-dependent electrical impedance and electromechanical coupling factors kp and kt reveal that the SBT-4Mn exhibits thermally stable electromechanical coupling characteristics up to 300 °C but electromechanical coupling factors deteriorate significantly at a higher temperature due to increased conductivity. Our work suggested that Mn-modified SBT ceramics are promising materials for high temperature piezoelectric applications.

Published
2016

2. Thermal stabilities of electromechanical properties in cobalt-modified strontium bismuth titanate (SrBi4Ti4O15)

Author

Hu-He Tian, Chun-Ming Wang, Qian Wang, Qing-Wei Fu, Zhao-Peng Cao, and De-Fu Yin

Subjects
Materials science, Piezoelectric sensor, Bismuth titanate, chemistry.chemical_element, Mineralogy, 02 engineering and technology, Dielectric, 01 natural sciences, Bismuth, chemistry.chemical_compound, 0103 physical sciences, Materials Chemistry, Ceramic, Composite material, 010302 applied physics, Mechanical Engineering, Metals and Alloys, 021001 nanoscience & nanotechnology, Ferroelectricity, Piezoelectricity, chemistry, Mechanics of Materials, visual_art, visual_art.visual_art_medium, 0210 nano-technology, Cobalt
Abstract

Bismuth layer-structured ferroelectric (BLSF) strontium bismuth titanate (SrBi 4 Ti 4 O 15 , SBT) ceramic oxides with B -site cobalt substitutions have been synthesized using conventional solid–state reaction. The dielectric, piezoelectric, and ferroelectric properties of cobalt-modified SBT are investigated in detail. The results indicate that cobalt is very effective in promoting the piezoelectric performance of SBT. The SBT modified with 3 mol% Co 3+ (SBT-3Co) exhibits the optimized piezoelectric properties, with a piezoelectric constant d 33 of 28 pC/N, which is the highest value among the modified SBT-based piezoelectric ceramics ever reported. The temperature-dependent electrical impedance, resonance frequencies, and electromechanical coupling factors ( k p and k t ) reveal that the cobalt-modified SBT ceramics have good thermal stabilities of electromechanical properties up to 300 °C. These results demonstrate that the cobalt-modified SBT ceramics are promising materials for high temperature piezoelectric sensors applications.

Published
2016

3. Microstructure and Deuterium Retention of Tungsten Deposited by Hollow Cathode Discharge in Deuterium Plasma

Author

Wenjia Han, Zhong-Chao Sun, Qing-Wei Fu, Ziwei Lian, Wei-Na Qiao, Kaigui Zhu, and Jiangang Yu

Subjects
010302 applied physics, Materials science, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, Tungsten, Microstructure, 01 natural sciences, Deuterium plasma, Cathode, 010305 fluids & plasmas, law.invention, chemistry, Deuterium, law, 0103 physical sciences
Published
2017

4. Microstructure and Deuterium Retention of Tungsten Deposited by Hollow Cathode Discharge in Deuterium Plasma.

Author

Zhong-Chao Sun, Zi-Wei Lian, Wei-Na Qiao, Jian-Gang Yu, Wen-Jia Han, Qing-Wei Fu, and Kai-Gui Zhu

Subjects
TUNGSTEN, METAL microstructure, CATHODES, DEUTERIUM plasma, FUSION reactors
Abstract

Tungsten has been chosen as one of the most promising candidates as the plasma-facing material in future fusion reactors. Although tungsten has numerous advantages compared with other materials, issues including dust are rather difficult to deal with. Dust is produced in fusion devices by energetic plasma-surface interaction. The re-deposition of dust particles could cause the retention of fuel atoms. In this work, tungsten is deposited with deuterium plasma by hollow cathode discharge to simulate the dust production in a tokamak. The morphology of the deposited tungsten can be described as a film with spherical particles on it. Thermal desorption spectra of the deposited tungsten show extremely high desorption of the peak positions. It is also found that there is a maximum retention of deuterium in the deposited tungsten samples due to the dynamic equilibrium of the deposition and sputtering process on the substrates. [ABSTRACT FROM AUTHOR]

Published
2017
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